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Robin, Cecile, Francois Guillocheau, Pascal Allemand, Sylvie Bourquin, Gilles Dromart, Jean-Michel Gaulier, and Christophe Prijac. "Echelles de temps et d'espace du controle tectonique d'un bassin flexural intracratonique; le bassin de Paris." Bulletin de la Société Géologique de France 171, no. 2 (March 1, 2000): 181–96. http://dx.doi.org/10.2113/171.2.181.
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Abstract The Meso-Cenozoic intracratonic flexural Paris Basin is a good tool to determinate the time/space-scales of the tectonic control on the sedimentary record. This study is based on basin-scale 2D sedimentary geometries of the different orders of stratigraphic cycles and on 1D/3D accommodation space measurements (space available for sediments created by subsidence and/or eustatism). Tectonic controls occur at least at three different time-scales: 230 m.y. (basin evolution), 10-40 m.y. (major stratigraphic cycles) and 1-5 m.y. (minor stratigraphic cycles). The evolution of the flexural intracratonic Paris basin can be described as the result of a long term thermal subsidence component with superimpositions of short-term tectonic components, due to intraplate deformations of 10-40 Ma and 1-5 Ma frequencies.
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Yelles-Chaouche, A. K., R. Ait Ouali, R. Bracene, M. E. M. Derder, and H. Djellit. "Chronologie de l'ouverture du bassin des Ksour (Atlas Saharien, Algerie) au debut du Mesozoique." Bulletin de la Société Géologique de France 172, no. 3 (May 1, 2001): 285–93. http://dx.doi.org/10.2113/172.3.285.
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Abstract The Ksour mountains (northwest Algeria) belong to the western part of the Saharan Atlas. They are located between the High Plateau to the north, the South Atlas Front to the south and the Moroccan High Atlas to the west (fig. 1a). During the last decades, the Ksour mountains were the focus of several studies, mainly based on sedimentary analyses [Cornet, 1952; Bassoulet, 1973; Baiche, 1975; Ameur, 1978; Ait Ouali, 1991; Mekahli, 1995; Elmi et al., 1998]. These studies indicate that the Ksour mountains correspond to an old asymmetric rift, trending NE-SW, which underwent extension during the Triassic and Liassic [Ait Ouali, 1991; Frizon de Lamotte et al., 2000]. In order to precise the timing of the rifting processes we have analysed subsurface data (seismic lines and borehole data) from the Sonatrach Company.
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Cyrille, Yao Kouadio, Kouassi Kouamé Alfred, Boga Atabli Hervé, Monde Sylvain, Digbehi Zéli Bruno, and N’da Loukou Victor. "Contribution A La Caracterisation Diagraphique Des Depots Carbonates Du Cretace Du Bassin Sedimentaire De Cote D’ivoire." European Scientific Journal, ESJ 12, no. 33 (November 30, 2016): 391. http://dx.doi.org/10.19044/esj.2016.v12n33p391.
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To know the petrophysical characteristics associated with sedimentary facies gammay ray logs providing information on the natural radioactivity of sedimentary rocks and the sonic logs which document on facies and petrophysical variations rocks were studied. This study focused on three (3) wells (BH-X, DH-X and MR-X) bored in the offshore basin of Abidjan margin (Côte d’Ivoire) for which the lithogy is constituted of clay alternating with sand an sandstone at the base surmounted by limestone and marls which are covered by clay series. It reveals that two deposits phases occurred during the carbonate sedimentation. Through the gamma ray logs, it appears that the clay phases have low radioactivity, which often progress to average values. This radioactivity recorded in clays would be linked to the low organic matter content and leaching reworked elements. In marl phases radioactivity is medium to high indicating a high content of uranium, thorium and potassium deriving from clay minerals. The gamma ray log varies significantly in limestone phases reflecting the heterogeneity of deposits. Strong radioactivity values in some limestone layers are related to their homogeneity and the present of organic matter. Fluctuations result from long-term changes in submarine hydrothermal flow and may indicate significant variations in facies (crystalline limestone, marl and clay). There are more or less dolomitised layers alternating with more homogeneous chemical limestone benches, biogenic limestone debris of organisms and past clay. The sonic log has two phases in the marl and limestone interval. In the marl phase, the acoustic wave velocity is almost constant, but in the limestone phase velocities fluctuate. Indeed, marl interval contains heterogeneous deposits. Generally the velocity is still low in impermeable and little porous clay. In marls, relatively high propagation velocity implies that they are less penetrable as clays because of the presence of fluid. The sonic log fluctuations in the limestone stage reflect the heterogeneity of deposits. Calcareous layers generally have a shorter time of wave propagation, suggesting that they are indurated, recrystallized and homogeneous. By against certain layers are poorly penetrable and show the presence of fluid. The limestone is fractured, so more porous than clay and marl. The porosity may be related to diagenesis after being dessoluted.
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Hughes, K. Stephen, James P. Hibbard, Jeffrey C. Pollock, David J. Lewis, and Brent V. Miller. "Detrital Zircon Geochronology Across the Chopawamsic Fault, Western Piedmont of North-Central Virginia: Implications for the Main Iapetan Suture in the Southern Appalachian Orogen." Geoscience Canada 41, no. 4 (December 3, 2014): 503. http://dx.doi.org/10.12789/geocanj.2014.41.052.
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The Chopawamsic fault potentially represents the main Iapetan suture, previously unidentified in the southern extent of the Appalachian orogen. The fault trends through the north-central portion of the western Piedmont of Virginia and separates the composite metaclastic Potomac terrane, commonly interpreted to be of Laurentian affinity, from the Chopawamsic terrane, the remains of a Middle Ordovician volcanic arc of uncertain crustal affinity. To gain insight on the first-order orogenic significance of the Chopawamsic fault, we report the results of LA–ICP–MS U–Pb analyses of 1,289 detrital zircons from 13 metasedimentary rock samples collected from both sides of the fault. The near exclusivity of Middle Ordovician zircon grains (ca. 470 – 460 Ma) in four sampled metasedimentary rocks of the Chopawamsic Formation likely represents the detrital recycling of syndepositional Chopawamsic volcanic rocks. A subset of Cambrian and older grains hint at one or more additional, older sources. Samples from the Potomac terrane include mostly Mesoproterozoic zircon grains and these results are consistent with previous interpretations that the metaclastic rocks are Laurentian-derived. The youngest zircons (ca. 550 – 500 Ma) and the age of cross-cutting plutons indicate that at least some parts of the Potomac terrane are Late Cambrian – Early Ordovician. The results imply temporally discrete and geographically isolated sedimentary systems during deposition of sedimentary rocks in the Chopawamsic and Potomac terranes. Metasedimentary rocks near Storck, Virginia, previously identified as a successor basin, contain detrital zircon populations that indicate they are actually peri-Gondwanan derived metasedimentary rocks unrelated to a successor basin system; their geographic position between the Laurentian-derived Potomac terrane and the Chopawamsic terrane suggests a peri-Gondwanan affinity for the Chopawamsic arc and geographic separation of the Chopawamsic and Potomac terranes in the Middle Ordovician. Consequently, we tentatively support the hypothesis that the Chopawamsic fault system represents the main Iapetan suture in the southern Appalachian orogen. Most detrital zircons from samples of the Arvonia successor basin crystallized in the Ordovician—Silurian or Mesoproterozoic. These data suggest that the Arvonia basin was deposited in the latest Ordovician to Early Silurian only after the Late Ordovician accretion of the Chopawamsic arc to Laurentia. SOMMAIRELa faille de Chopawamsic représente peut-être la principale suture japétienne, non-reconnue dans prolongement sud de l’orogène des Appalaches. La faille traverse la portion nord du centre du piedmont ouest de Virginie et sépare le terrane métaclastique de Potomac, d’affinité laurentienne pensait-on, du terrane de Chopawamsic, vestige d’un arc volcanique de l’Ordovicien moyen d’affinité crustale incertain. Afin de mettre en lumière la signification orogénique première de la faille de Chopawamsic, nous présentons les résultats d’analyses U-Pb par ICP–MS par AL sur 1 289 zircons détritiques provenant de 13 échantillons de roches métasédimentaires prélevés de chaque côté de la faille. L’existence quasi-exclusive de grains de zircon de l’Ordovicien moyen (env. 470 – 460 Ma) dans quatre roches métasédimentaires de la Formation de Chopawamsic représente vraisemblablement le recyclage détritique des roches volcaniques synsédimentaires de Chopawamsic. Un sous-ensemble de grains cambriens et plus anciens, évoque l’existence d’une ou plusieurs sources plus anciennes additionnelles. Les échantillons du terrane de Potomac renferment principalement des grains de zircon du Mésoprotérozoïque, ce qui correspond avec les interprétations antérieures voulant que les roches métaclastiques soient d’origine laurentienne. Les zircons les plus jeunes (env. 550 – 500 Ma) ainsi que l’âge des plutons qui recoupe l’encaissant indiquent qu’au moins certaines parties du terrane de Potomac sont de la fin du Cambrien ou du début de l’Ordovicien. Les résultats impliquent l’existence de systèmes sédimentaires distincts au cours du temps, et isolés géographiquement durant le dépôt des roches sédimentaires dans les terranes de Chopawamsic et de Potomac. Les roches métasédimentaires près de Storck en Virginie, jadis interprétées comme bassin successeur, renferment des populations de zircons détritiques qui indiquent qu’ils proviennent en fait de roches métasédimentaires péri-gondwaniennes sans rapport avec un système de bassin successeur; leur localisation géographique entre le terrane de Potomac issu des Laurentides et le terrane de Chopawamsic porte à penser que l’arc de Chopawamsic est d’affinité péri-gondwanienne, et que les terranes de Chopawamsic et de Potomac à l’Ordovicien moyen étaient séparés géographiquement. En conséquence il nous semble justifié de proposer que le système de faille de Chopawamsic représente la principale suture japétienne dans le sud de l’orogène des Appalaches. La plupart des zircons détritiques des échantillons du bassin successeur d’Arvonia ont cristallisés entre l’Ordovicien et le Silurien ou au Mésoprotérozoïque. Ces données suggèrent que le bassin d’Arvonia s’est rempli de la fin entre l’Ordovicien et le début du Silurien, seulement après l’accrétion de l’arc de Chopawamsic à la Laurentie, à la fin de l’Ordovicien.
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Durlet, Christophe, and Jacques Thierry. "Modalites sequentielles de la transgression aaleno-bajocienne sur le sud-est du Bassin parisien." Bulletin de la Société Géologique de France 171, no. 3 (May 1, 2000): 327–39. http://dx.doi.org/10.2113/171.3.327.
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Abstract Sedimentologic, biostratigraphic and diagenetic studies made on Middle Aalenian to Lowermost Bathonian deposits in 25 outcrops of the Burgundy High (southeastern Paris basin) lead to a sequence stratigraphy subdivision of the early Dogger record into 7 third order depositional sequences. These sequences make up a second-order transgressive phase whose lower limit is a tectonically enhanced unconformity (the Mid-Cimmerian unconformity), associated with a large scale uplift during the Upper Toarcian and the Lower Aalenian. In the largest outcrops, where the geometry of sedimentary bodies is observable at the hectometre to kilometre scale, the combination of diagenetic, biostratigraphical, spatial and sedimentologic studies is useful to understand the evolution of sediment distribution in the sequences. This approach also allows the measurement of sea level falls at the origin of the sequence boundaries. For example, we show that Lower Bajocian sequences end with decreases of accommodation space <10 m in amplitude, leading to temporary emergences of some reef complexes. Without interrupting the sedimentation on submarine peri-reef pediments during lowstands, these decreases of a few metres of accomodation space can be related to either tectono-eustatic events or thermo-eustatic events.
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Surmely, Frédéric. "Characterization of Tertiary Flints by geochemistry; application to the French territory." Lietuvos archeologija Lietuvos archeologija T. 46 (December 18, 2020): 191–206. http://dx.doi.org/10.33918/25386514-046007.
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In present-day France, tertiary flints have played an important part in the supply of prehistoric populations, due to their abundance, quality and presence in areas without marine flint. From the Upper Paleolithic until the end of the use of flint, they were transported over far distances, especially in the center of the Central Massif. In this article the geochemical method is preferred for attributing of precise geographical origin to an archaeological artifact. To form the geological repository, a very large geographical field was taken, encompassing a large part of France, from the Marne county to the Gard county, and most of the major French sedimentary basins (Bassin Parisien, Cantal, Gard). The archaeological corpus includes pieces from sites of the Upper Paleolithic and the Epipaleolithic of Auvergne. The geochemical study does not provide a comprehensive answer to the question of the geographical origin of tertiary flints, but nevertheless allows for certain and significant advances in knowledge. Keywords: Flint raw materials, Palaeolithic age, Magdalenian, Raw materials, Geochemistry.
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Farki, Khadija, Ghalem Zahour, Youssef Zerhouni, and Hamid Wafa. "Contribution to the Understanding of the Sedimentary and Tectono-Volcanic Evolution of Triassic and Liassic Series of Oued N’Fifikh (Coast Meseta, Morocco)." Annales de la Société Géologique du Nord, no. 19 (December 1, 2012): 145–56. http://dx.doi.org/10.54563/asgn.1479.
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La série géologique de l’Oued N’Fifikh (région de Mohammedia, Maroc) est constituée d’un socle cambro-ordovicien gréso-micacé et d’une couverture méso-cénozoïque. Cette dernière débute par des terrains triasiques constitués successivement, de la base vers le sommet, par un ensemble silto-gréso-conglomératique (20m), des argilites inférieures (40m), et des coulés basaltiques (50m). Sur cette formation, se déposent des argilites supérieures évaporitiques (60m) d’âge liasique. Cette série est coiffée par des calcaires du Néogène. L’étude tectono-volcanologique associée à une étude sédimentologique permet de proposer un modèle d’ouverture de ce bassin sous forme d’un hémi-graben. Ce dernier, axé sur l’Oued N’Fifikh, s’intègre dans une dynamique distensive liée au rifting atlantique. La sédimentation et le volcanisme ont été guidés par des failles actives volcano-tectoniques héritées du socle hercynien. Celles-ci ont été réactivées lors de la distension triasico-liasique avant de rejouer pendant la compression atlasique.
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Cousineau, Pierre A., and Pierre St-Julien. "Stratigraphie et paléogéographie d'un bassin d'avant-arc ordovicien, Estrie-Beauce, Appalaches du Québec." Canadian Journal of Earth Sciences 31, no. 2 (February 1, 1994): 435–46. http://dx.doi.org/10.1139/e94-040.
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Two new formations, the Frontière and Etchemin formations, have been found to lie below the Beauceville and Saint-Victor formations, the two known formations of the Magog Group. The Frontière Formation, at the base of the group, is made up of centimeter-thick beds of medium- to coarse-grained litharenite and of greyish green mudstone; the sandstone, greyish green, contains abundant felsic volcanic rock fragments and chromite grains. The Etchemin Formation is composed mostly of centimeter-thick dusky yellow green siliceous mudstone; at the base, there is also a purple mudstone, and meter-thick beds of dusky green volcaniclastic rocks rich in intermediate to felsic volcanic rock fragments and crystals of feldspar and quartz occur near its top. The Beauceville Formation consists of interbedded centimeter-thick beds of black clayslate and centimeter- to meter-thick beds of black volcaniclastic rocks. The Saint-Victor Formation consists of classic turbidite beds with few meter-thick yellowish volcaniclastic rock beds similar to those of the Beauceville Formation; the sandstone is a litharenite rich in quartz grains and sedimentary rock fragments. Most rocks of the Frontière and Etchemin formations as well as the volcaniclastic rocks of the Beauceville and Saint-Victor formations were derived from a magmatic arc located to the southeast. However, the shale of the Beauceville Formation and the turbidites of the Saint-Victor Formation were derived from an orogenic source located to the northwest. The Magog Group is located between the Saint-Daniel Mélange and the Ascot Complex interpreted as remnants of an accretionary prism and a magmatic arc, respectively. The sediments of this group were thus deposited in a fore-arc basin active during the Taconian orogeny of the Middle to Late Ordovician.
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N’zi, Jean Claude, Mamadou Toure, N’goran Jean-Paul Yao, Rachelle Affouet Kouassi, Zeli Bruno Digbehi, and Kouamé Aka. "Caracterisation Sedimentologique Et Mineralogique Des Formations Tertiares Du Bassin Onshore De La Region D’abidjan, Cote d’Ivoire." European Scientific Journal, ESJ 14, no. 18 (June 30, 2018): 218. http://dx.doi.org/10.19044/esj.2018.v14n18p218.
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Analyzes carried out on 262 cuttings samples from two boreholes located in the coastal sedimentary basin of Abidjan (south-west of the lagoon fault) were aimed at the paleoenvironmental determination of tertiary-age deposits. Indeed, these sedimentological analyses allowed the characterization of the lithological nature of the formations encountered by AB and BM drilling. They also helped to determine the origin of the sedimented material as well as the hydrodynamic conditions that governed the placement of the various deposits. Moreover, the deposits medium of the studied formations was revealed. The formations consist of an alternation of sands and sandy clays in the AB drilling and essentially glauconous clays for BM drilling. In the clay intervals, there is a weak presence of calcium carbonates on the whole of the two boreholes. The sands analyzed are of different granulometric grades (very coarse, coarse, medium and fine) according to the intervals. This, therefore, shows the different variations in the energy of the current that transported the sediment. From a facies point of view, the granulometric facies is dominant in the study area, indicating the variation in watercourse competence during sedimentation. Mostly sub-angular to sub-rounded quartz grains suggest a relatively distal proving source while their shiny blunted appearance evokes an aquatic environment. The sediments of these wells are therefore sands of fluviatile origin, deposited in a shallow marine environment.
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NZALI, Timothée, Jean-Clair DUCHESNE, Christiane JACQUEMIN, and Jacqueline VANDER AUWERA. "Pyrométamorphisme induit par la gazéification souterraine de niveaux charbonneux du Westphalien dans le bassin de Mons (Belgique) [Pyrometamorphism induced by underground coal gasification of Westphalian beds in the Mons basin (Belgium)]." Geologica Belgica 2, no. 3-4 (June 1, 2000): 221–34. http://dx.doi.org/10.20341/gb.2014.020.
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During the underground coal gasification experiment conducted at Thulin (Belgium), partial melting occurred in the surrounding rocks (Westphalian shales and sandstones). Samples were collected at the roof of the coal bed. Minerals which crystallized from the partial melts were identified under the polarizing microscope, with electron probe microanalysis, by X-ray diffraction and scanning electron microscopy. They include cordierite, orthopyroxene, olivine, spinel, cristobalite, mullite, osumilite, K-feldspar, ilmenite, hematite, wollastonite, calcite, andradite, monticellite, pyrrhotite, and chalcopyrite. In these paralavas, the glass proportion ranges from 20 to 40%. In some cases, melting and subsequent crystallization have produced a magnetite-bearing gabbro. This gabbro contains an inclusion of sedimentary rock (relic) in which sillimanite, mullite and corundum were recognized. Metamorphic textures suggest that sillimanite is replaced by mullite, and mullite by corundum. Temperatures in the range of 1083 °C up to 1500 °C have been estimated for the underground coal gasification process by several methods: phase diagrams in the system (FeO, MgO)-Al2O3-SiO2 numerical modelling of gabbro crystallization, cordierite polymorphs crystallization, and metamorphic reactions.
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Flotte, Nicolas, Juventino Martinez-Reyes, Claude Rangin, Xavier Le Pichon, Laurent Husson, and Marc Tardy. "The Rio Bravo fault, a major late Oligocene left-lateral shear zone." Bulletin de la Société Géologique de France 179, no. 2 (March 15, 2008): 147–60. http://dx.doi.org/10.2113/gssgfbull.179.2.147.
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Abstract It has generally been assumed that the last major compressive deformation in the Sierra Madre Oriental (Mexico) took place during the Laramide orogenesis (Upper Cretaceous – Early Eocene). We have studied the N120° Rio Bravo fault zone probably inherited from the Jurassic opening of the gulf of Mexico. This fault zone is located along the international boundary between United States and Mexico. We demonstrate that it was active mainly during the Oligocene. In the Ojinaga area (Chihuahua), the Sierra Madre Occidental, Oligocene volcanic sequences overlying conformably the sedimentary Upper Cretaceous sequence, are both tightly folded before 30 Ma. We think this folding is associated with motion of a major left-lateral fault, the Rio Bravo left lateral fault. These left-lateral fault system affects also the Sabinas fold-belt and extends below the Burgos bassin. This deformation is also imaged by gravimetric data and the offsets the Palaeocene-Eocene oil fields that are displaced left laterally. We propose that during the Oligocene, this ~1000 km long left-lateral shear zone that might be called the Rio Bravo fault was active during the Oligocene with a total offset of 40–60 km.
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Holanda, Werlem, Anderson Costa dos Santos, Camila Cardoso Nogueira, Luiz Carlos Bertolino, Sérgio Bergamaschi, René Rodrigues, and Diego Felipe da Costa. "EFFECTS OF IGNEOUS INTRUSION ON THE MINERALOGICAL CONTENT OF IRATI FORMATION, PARANÁ BASIN, IN SAPOPEMA (PR), SOUTHERN BRAZIL." Journal of Sedimentary Environments 4, no. 3 (September 28, 2019): 350–60. http://dx.doi.org/10.12957/jse.2019.45796.
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Igneous intrusions in sedimentary basins are commonly related with mineralogical association changes in host-rock. At Sapopema region (Paraná State, southern Brazil), an extensive diabase sill (associated to Serra Geral Formation) was emplaced in pelitic-carbonate succession during post-Triassic. The sedimentary host-rock association includes mostly shale, siltstone and carbonate of the Permian Irati Formation. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) data revealed that heat transfer was not enough to cause modifications in mineral assemblage of the Taquaral Member (quartz + albite + muscovite + illite + kaolinite + chlorite). However, mineralogical content from Assistência Member presented changes probably caused by the intrusion of diabase sill (talc + pyrophyllite + calcite). Talc and calcite were formed due to the reaction between dolomite and quartz, while pyrophyllite was the product of reaction between kaolinite and quartz. EFEITOS DA INTRUSÃO IGNEA NA COMPOSIÇÃO MINERALÓGICA DA FORMAÇÃO IRATI, BACIA DO PARANÁ, SAPOPEMA (PR), SUL DO BRASIL ResumoAs intrusões ígneas em bacias sedimentares dão origem em geral a alterações mineralógicas da rocha hospedeira. Na região de Sapopema (Estado do Paraná, sul do Brasil), uma extensa soleira de diabásio (associada à Formação Serra Geral) pós-Triássica, foi intrudida numa sucessão sedimentar constituída por pelitos e carbonatos. A associação de rochas sedimentares hospedeiras, era principalmente constituída por folhelho, siltito e carbonato da Formação Irati, do Permiano. Dados de difração de raios X (DRX), microscopia eletrônica de varredura (MEV) e espectroscopia de energia dispersiva (EDS) revelaram que a transferência de calor não foi suficiente para causar modificações na composição mineralógica do membro Taquaral (quartzo + albita + moscovita + ilita + caulinita + clorita). No entanto, o conteúdo mineralógico do Membro Assistência apresentou alterações, provavelmente causadas pela intrusão do diabásio (talco + pirofilita + calcita). O talco e a calcita foram formados devido à reação entre dolomita e quartzo, enquanto a pirofilita foi o produto da reação entre a caulinita e o quartzo. Palavras-chave: Bacia Sedimentar. Intrusões Ígneas. Metamorfização de sedimentos. Reações mineralógicas. XRD. SEM / EDS.
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Fyffe, Leslie R. "The Grand Manan Terrane of New Brunswick: Tectonostratigraphy and Relationship to the Gondwanan Margin of the Iapetus Ocean." Geoscience Canada 41, no. 4 (December 3, 2014): 483. http://dx.doi.org/10.12789/geocanj.2014.41.051.
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Recently gathered stratigraphic and U–Pb geochronological data indicate that the pre-Triassic rocks of the Grand Manan Terrane on the eastern side of Grand Manan Island can be divided into: (1) Middle Neoproterozoic (late Cryogenian) quartzose and carbonate sedimentary sequences (The Thoroughfare and Kent Island formations); (2) a Late Neoproterozoic (early Ediacaran) volcanic-arc sequence (Ingalls Head Formation); and (3) Late Neoproterozioc (mid- Ediacaran) to earliest Cambrian (early Terreneuvian) sedimentary and volcanic-arc sequences (Great Duck Island, Flagg Cove, Ross Island, North Head, Priest Cove, and Long Pond Bay formations). A comparison to Precambrian terranes on the New Brunswick mainland (Brookville and New River terranes) and in adjacent Maine (Islesboro Terrane) suggests that the sedimentary and volcanic sequences of the Grand Manan Terrane were deposited on the continental margin of a Precambrian ocean basin that opened during the breakup of Rodinia in the Middle Neoproterozoic (Cryogenian) and closed by the Early Cambrian (Terreneuvian) with the final assembling of Gondwana. Rifting associated with the initial opening of the Paleozoic Iapetus Ocean began in the Late Neoproterozoic (late Ediacaran) and so overlapped in time with the closing of the Precambrian Gondwanan ocean. The southeastern margin of the Iapetus Ocean is defined by thick sequences of quartz-rich Cambrian sediments (within the St. Croix and Miramichi terranes of New Brunswick) that were largely derived from recycling of Precambrian passive-margin sedimentary rocks preserved in the Grand Manan and Brookville terranes of New Brunswick and in the Islesboro Terrane of Maine. These Precambrian terranes are interpreted to represent dextrally displaced basement remnants of the Gondwanan continental margin of Iapetus, consistent with the model of a two-sided Appalachian system proposed by Hank Williams in 1964 based on his work in Newfoundland.SOMMAIREDes données stratigraphiques et géochronologiques U–Pb obtenues récemment indiquent que les roches prétriasiques du terrane de Grand Manan du côté est de l’île Grand Manan peuvent être répartis en: 1) séquences sédimentaires quartzeuses et carbonatées du Néoprotérozoïque moyen (Cryogénien tardif) (formations de Thoroughfare et de Kent Island); 2) séquence d’arc volcanique du Néoprotérozoïque tardif (Édiacarien précoce) (formation d’Ingalls Head); 3) séquences sédimentaires et d’arc volcanique du Néoprotérozoïque tardif (milieu de l’Édiacarien) au tout début du Cambrien (Terreneuvien précoce) (formations de Great Duck Island, Flagg Cove, Ross Island, North Head, Priest Cove et Long Pond Bay). Une comparaison avec des terranes du Précambrien dans la partie continentale du Nouveau-Brunswick (terranes de Brookville et New River) et dans le Maine adjacent (terrane d’Islesboro) semble indiquer que les séquences sédimentaires et volcaniques du terrane de Grand Manan se sont déposées sur la marge continentale d’un bassin océanique précambrien qui s’est ouvert durant la fracturation de la Rodinia au Néoprotérozoïque moyen (Cryogénien) et s’est fermé au Cambrien précoce (Terreneuvien) avec l’assemblage final du Gondwana. La distension continentale associée à l’ouverture initiale de l’océan Iapetus au Paléozoïque a commencé au Néoprotérozoïque tardif (Édiacarien tardif) et a donc partiellement coïncidé avec la fermeture de l’océan précambrien du Gondwana. La marge sud-est de l’océan Iapetus est définie par d’épaisses séquences de sédiments cambriens riches en quartz (dans les terranes de St. Croix et de Miramichi du Nouveau-Brunswick) issus en grande partie du recyclage de roches sédimentaires de la marge continentale passive du Précambrien préservées dans les terranes de Grand Manan et de Brookville au Nouveau-Brunswick et dans le terrane d’Islesboro dans le Maine. Ces terranes précambriens sont interprétés comme la représentation de vestiges, ayant subi un déplacement dextre, du socle de la marge continentale gondwanienne de l’océan Iapetus, ce qui concorde avec le modèle d’un système appalachien à deux côtés proposé par Hank Williams en 1964 sur la base de ses travaux à Terre-Neuve.
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Fea, Isaac, Able Guiako Jonas, Maria Kamagate Djodjo, and Paul Assalé Fori Yao. "Reconstitution Paléoenvironnementale des Formations Maastrichtiennes, Cénomaniennes et Albiennes Basée sur les Données Sédimentologiques et Ichnologiques Issues des Carottes du Puits FIM-1X dans le Bassin Sédimentaire Offshore de la Cote d’Ivoire." European Scientific Journal, ESJ 18, no. 21 (June 30, 2022): 295. http://dx.doi.org/10.19044/esj.2022.v18n21p295.
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Les études sédimentologiques et ichnologiques détaillées du puits FIM-1X ont été effectuées. Les analyses physiques ont été réalisées sur les échantillons de carottes. L'objectif principal est de caractériser la diversité de faciès rencontrés dans les formations maastrichtiennes, cénomaniennes et albiennes afin de déterminer les différents paléoenvironnement rencontrés dans le puits FIM-1X du bassin offshore de Côte d’Ivoire. Les résultats sédimentologiques indiquent que les successions lithologiques des échantillons de carottes comprennent quatre grands groupes de lithofaciès : galets (PS), grès propre (S), sable argileux (SM) et argile (HM, ML, MJ & M). Ces groupes de lithofaciès ont ensuite été subdivisés en faciès constitutifs basés principalement sur des structures sédimentaires. Le groupe des galets comprend uniquement les granules. Le groupe de grès propre comprend trois faciès : grès massif, grès laminé et grès à rides. Le groupe de sable argileux comprend deux faciès à savoir les sables argileux laminés et déformés. Le groupe d’argile comprend trois faciès principaux, à savoir les structures hétérolithiques à dominance argileuses, les argiles calcareuses, et les argiles pures. Une diversité d'ichnofossiles a été identifiée dans les carottes, notamment : Ophiomorpha, Palaeophycus, Thalassinoides, Spyrophyton et Scolicia. L’intégration des données sédimentaires (faciès de granules, grès, sable argileux et argile) et des ichnofossiles reconnues a permis de caractériser des environnements de chenaux du front deltaïque, de complexe chenaux – levées et de milieux marins côtiers (Shoreface) dans ces formations carottés d’âge Maastrichtien, Cénomanien at Albiens. Ces conditions d'environnements bien préservés pourraient constituer de possibles bons réservoirs d'hydrocarbures.
Detailed sedimentological and ichnological studies of FIM-1X well were performed. Physical analyses were carried out on the core samples. The main target is to characterize the diversity of facies encountered in the Maastrichtian, Cenomanian and Albian formations in order to determine the different paleoenvironments encountered in the FIM-1X well of the Côte d'Ivoire offshore basin. The sedimentological results indicate that the lithological successions of the core samples include four major groups of lithofacies: pebbles (PS), clean sandstone (S), muddy sandstone (SM) and mudstone (HM, ML, MJ & M). These lithofacies groups were then subdivided into constituent facies based mainly on sedimentary structures. The group of pebbles includes only the granules. The clean sandstone group includes three facies: massive sandstone, laminated sandstone and ripple sandstone. The muddy sandstone group includes two facies namely the laminated and deformed muddy sandstone. The mudstone group includes three main facies, namely heterolithic structures predominantly mudstone, calcareous mudstone, and pure mudstone. A variety of ichnofossils have been identified in cores, including: Ophiomorpha, Palaeophycus, Thalassinoides, Spyrophyton and Scolicia. The integration of sedimentary data (granule, sandstone, muddy sandstone and mudstone facies) and recognized ichnofossils made it possible to characterize the environments of delta front channels, complex channels - levees and shallow marine environments (Shoreface) in these Maastrichtian, Cenomanian and Albian formations. These well preserved environments conditions could be a possible good hydrocarbon reservoirs.
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Yoboue, Kouadio Emile, Bi Trazié Jérémie Gala, Marie-Paule Hien, and Kouassi Yannick Stéphane Gboko. "Pédo-géochimie et minéralogie des sols à cuirassement sur substrat sédimentaire de Bingerville, au nord-est du district d’Abidjan, Côte d’Ivoire." International Journal of Biological and Chemical Sciences 17, no. 6 (January 18, 2024): 2525–35. http://dx.doi.org/10.4314/ijbcs.v17i6.30.
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Pour déterminer la dynamique pédo-géochimique du cuirassement des sols sur le bassin sédimentaire de Côte d’Ivoire, des échantillons de sol et des indurations ont été prélevés à Bingerville, analysés au spectromètre à fluorescence X et au diffractomètre à rayons X. Les résultats ont révélé que les oxydes de silicium (SiO2), de fer (Fe2O3) et d’aluminium (Al2O3) étaient les principaux constituants des sols et des formations indurées. Dans les sols et les croûtes, en plus de la silice (27-62%), il s’y observait une forte concentration de chrome (420 à 1890 ppm) dans les échantillons. Par contre dans les cuirasses, ce sont les oxydes de fer (18-57%), le nickel (80 à 108 ppm), le plomb (64 ppm) et le Cadmium (30 ppm) qui étaient les plus concentrés. Au niveau minéralogique, les sols et les indurations étaient principalement constitués du quartz (environ 70%) et d’hématite (environ 4%) pour les oxydes et de kaolinite (24-33%) pour les minéraux argileux. Les indurations observées sur substrat sédimentaire sont assimilables au niveau pédo-géochimique à celles développées sur le socle protérozoïque du Centre et du Nord de la Côte d’Ivoire mais, leurs teneurs en ETM pourraient constituer des sources de toxicité pour les populations.
To determine the pedo-geochemical dynamic of soil duricrust in sedimentary basins in Côte d'Ivoire, soil samples were taken in Bingerville and analysed using an X-ray fluorescence spectrometer and an X-ray diffractometer. The results showed that oxides of silicon (SiO2), iron (Fe2O3) and aluminium (Al2O3) were the main constituents of the soils and indurated formations. In the soils and crusts, in addition to silica (27-62%), there was a high concentration of chromium (420 to 1890 ppm) in the samples. However, in the duricrusts, iron oxides (18-57%), nickel (80 to 108 ppm), lead (64 ppm) and Cdmium (30 ppm) were the most concentrated. Mineralogically, the soils and indurations were mainly composed of quartz (around 70%) and hematite (around 4%) for the oxides and kaolinite (24-33%) for the clay minerals. The indurations observed on sedimentary substrates are comparable at the pedo-geochemical level to those developed on Proterozoic bedrock in central and northern Côte d'Ivoire, but their TME content could be a source of toxicity for local populations.
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Motoki, Akihisa, Luiz Carlos Chaves Novais, Kenji Freire Motoki, Leonardo Costa de Oliveira, Ricardo De Souza Fasolo, and Adrienne Brito Lima. "SATELLITE-DERIVED GRAVIMETRY FOR ABROLHOS CONTINENTAL SHELF, STATES OF ESPÍRITO SANTO AND BAHIA, BRAZIL, AND ITS RELATION TO TECTONIC GENESIS OF SEDIMENTARY BASINS." Revista Brasileira de Geofísica 32, no. 4 (December 1, 2014): 735. http://dx.doi.org/10.22564/rbgf.v32i4.554.
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ABSTRACT. This paper presents the results of satellite-derived gravimetry for Abrolhos Continental Shelf and the adjacent areas, States of Esp´ırito Santo and Bahia,Brazil, and discusses tectonic genesis of the sedimentary basins. The free-air and Bouguer anomalies on the continental shelf show a gradual increase from coast tocontinental shelf break. The total difference of 135 mGal indicates crust thinning of 4.5 km. The Bouguer anomaly increases beyond the shelf break and continues upto the abyssal plane. The total difference of 260 mGal suggests crustal thinning of 9.0 km. The studied area has two types of passive continental margin: 1) ES-typewith high continental slope, low and narrow continental rise, and high free-air and Bouguer anomalies; 2) SP-type with low continental slope, high and wide continentalrise, and low gravity anomalies. There are three types of sedimentary basins with different geologic structure and tectonic genesis: 1) Basins on the continental shelf,CSH-type; 2) Basin on the continental rise, CRS-type; 3) Continental rift basin, CRF-type. The CSH-type, as Esp´ırito Santo basin, has coherent free-air and Bougueranomalies 40 to 50 mGal lower than the adjacent areas. The sedimentary deposits are 2.0 to 2.5 km thick. The basement depression is sustained by mechanical strengthwithout isostatic compensation. The normal faults of basin border are limited within upper crust. The CRS-type, as Pedro Can´ario basin, has low local residual Bougueranomaly with difference of 40 mGal. The sedimentary deposits are more than 2.7 km thick. The continental side basin border is under isostatic compensation due todeep normal fault between continental slope and continental rise. The oceanic side border is sustained by mechanical strength of the basement. The CRF-type, BesnardPassage, is a continental rift basin originated from mantle pull-apart tectonism. The rift bottom is under complete isostatic compensation. The normal faults of the grabenborder continue to the mantle. The Moho depth along the rift is at least 6.5 km shallower than the adjacent areas.Keywords: satellite-derived gravimetry, Abrolhos Continental Shelf, sedimentary basin, crustal thinning, isostatic compensation. RESUMO. Este artigo apresenta os resultados da gravimetria por satélite para a Plataforma Continental de Abrolhos e as áreas adjacentes, ES-BA, e discute as gêneses tectônicas das bacias sedimentares. As anomalias ar-livre e Bouguer na plataforma continental mostram um aumento gradativo a partir da costa até a quebra da plataforma continental. A diferença total de 135mGal indica afinamento da crosta continental de 4,5 km. A anomalia Bouguer se apresenta além da quebra da plataformae continua até o assoalho abissal. A diferença total de 260 mGal sugere afinamento crustal de 9,0 km. Na área estudada, observam-se dois tipos de margem continental passiva: 1) Tipo ES com talude continental alto, elevação continental baixa e curta e anomalias ar-livre e Bouguer altos; 2) Tipo SP com talude continental baixo, elevação continental alta e extensa e anomalias gravimétricas baixas. Existem três tipos de bacias sedimentares com estrutura geológica e gênesis tectônicas diferentes: 1) Bacias na plataforma continental, Tipo CSH; 2) Bacias na elevação continental, Tipo CRS; 3) Bacia de rifte continental, Tipo CRF. O Tipo CSH, como a bacia do Espírito Santo, possui anomalias ar-livre e Bouguer coerentes 40 a 50 mGal mais baixas do que as áreas adjacentes. Os depósitos sedimentares são de 2,0 a 2,5 km de espessura. A depressão do embasamento é sustentada pela rigidez mecânica sem compensação isostática. As falhas normais das bordas de bacias são limitadas dentro da crosta superior. O Tipo CRS, como a bacia Pedro Canário, tem baixa anomalia Bouguer local com diferença de 40 mGal. Os depósitos sedimentares têm mais de 2,7 km de espessura. A borda da bacia do lado continental está sob compensação isostática devido à falha normal profunda entre talude continental e elevação continental. Aborda do lado oceânico é sustentada pela rigidez mecânica do embasamento. O Tipo CRF, Passagem Besnard, é uma bacia do rifte continental originada do tectonis mode distensão do manto. O fundo da bacia está sob compensação isostática completa. As falhas normais da borda do graben continuam até o manto. A profundidade da Moho ao longo do rifte é pelo menos 6,5 km mais rasa do que as áreas adjacentes.Palavras-chave: gravimetria por satélite, Plataforma Continental de Abrolhos, bacia sedimentar, afinamento crustal, compensação isostática.
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Ouakhir, Hassan, Nadia Ennaji, Mohamed El Ghachi, and Mimoune Goumih. "La Réalisation d’Un Modèle Numérique du Terrain pour l’Etude de la Dynamique de l’Erosion Hydrique dans une Section Fluviale en Amont du Barrage de Bin El Ouidane (2016-2017)-(Haut Atlas/ Maroc)." European Scientific Journal, ESJ 19, no. 27 (September 30, 2023): 357. http://dx.doi.org/10.19044/esj.2023.v19n27p357.
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Au Maroc, l’érosion est l'un des phénomènes qui entrave le développement économique et social en général, et agricole en particulier, des zones de montagnes. L'analyse des problèmes de l'érosion hydrique à l'échelle nationale, montre que 12,5 millions d'hectares de terres de culture et de parcours, sont réellement menacées par l'érosion. Sa localisation entre la Méditerranée au Nord, l’océan Atlantique à l’Ouest, le Sahara au Sud et au Sud-Est et sa nature orographique particulière, lui confère une diversité climatique et écologique remarquable. Situé dans le Haut-Atlas Central Marocain, le bassin versant de l’Oued El Abid, évolue dans un contexte climatique méditerranéen semi- aride, avec une pluviométrie très variable dans le temps et dans l’espace. Les versants exposés aux perturbations océaniques d’ouest sont bien arrosés, tandis que ceux faisant face à l’Est sont plus secs. Les écoulements sont montagnards, avec un caractère torrentiel. L’occupation des sols est représentée essentiellement par la céréaliculture, avec très peu d’arboriculture qui est pratiquée par les populations locales sur les terrasses fluviales de fonds de ce bassin. Les sols sont de plus en plus dégradés, et la mise en place des accumulations sédimentaires issues de l’érosion, conduisent à l’envasement du barrage de Bin El Ouidane. Cet envasement est le résultat de l’érosion des sols, le sapement et l’incision des berges de l’oued El Abid. Durant les périodes de crues, ce barrage s’envase par les courants de densité. La méthodologie adoptée dans cet article concentre sur la réalisation de deux modèles numériques de terrain pour deux compagnes (2016 et 2017), avec une résolution liée à la qualité des mesures, dont la marge d’erreur ne dépasse pas quelques centimètres. Cet article vise à comparer les résultats du processus de l’érosion hydrique de deux modèles réalisés (2016 et 2017), suivre leur évolution, et établir les bilans de la dynamique dans la section étudiée. Cette approche utilisée a permis, la caractérisation de l’état des surfaces, la variation temporelle des facteurs influençant l’érosion fluviale dans l’aval de l’Oued El Abid et de comprendre enfin, les processus de l’érosion hydrique et son influence directe sur la retenue de Bin El Ouidane en aval. Les résultats obtenus permettent l’identification des secteurs à l’échelle du bassin où les interventions sont nécessaires pour limiter les processus de dégradation des sols.
In Morocco, erosion is one of the phenomena that influence economic and social development generally, and agricultural development particularly in mountainous areas. Analyzing the problems of water erosion at national scale, shows that 12.5 million hectares of land uses and pastures, are really threatened by erosion. Its location between the Mediterranean region in the North, the Atlantic Ocean in the West, the Sahara in the South and South-East and its orographic nature, makes it remarkable ecological diversity and climatic characteristics. El Abid basin is mountainous area, situated in the Moroccan High Atlas, and is extending over semi-arid Mediterranean climate, with rainfall that varies greatly in time and space. The slopes exposed to ocean disturbances from the west are well wetting, while those facing to the east are drier. The flow is mountainous, with a torrential character. Land use is mainly represented by cereal cultivation, with very arboriculture which is practiced by local populations on the river terraces in the middle of El Abid basin. The soils are degraded and contributed to sedimentary accumulations resulting from erosion which led to the siltation of Bin El Ouidane dam. This siltation is the result of soil erosion, and the incision of the banks of El Abid river. During flush flood events, this dam is silted up by suspended sediment transport. The adopted methodology focuses on the realization a Digital Elevation Model (DEM)”, for two companions (2016 and 2017), with high spatial resolution, that is to say with resolutions of a few centimeters to a few meters and with restitution qualities in Z (elevation). The main objective of this article is to analyze the river dynamic results of these the two DEM at 2016 and 2017, comparing the dynamic, following their evolution, and establishing erosion balances at the studied section, when a centimeter precision is required. This used approach allowed to characterize the surface state and the temporal variation of the factors influencing fluvial erosion in El Abid basin. finally understanding, the processes of fluvial dynamics and its impact on Bin El Ouidane dam. The obtained results allow the identification of space at the basin scale where the interventions are necessary to limit the processes of soil degradation.
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Nascimento, Dione Nunes do, Marcelo Dos Santos Salomão, Miguel Angelo Mane, Mauro Cesar Geraldes, Ciro Appi, and Maria Virginia Alves Martins. "MARINE TRANSGRESSION RECORDS IN THE SEPETIBA BAY REGION (RJ-BRAZIL) BY GPR AND GROUND MAGNETIC SURVEY." Journal of Sedimentary Environments 4, no. 4 (December 16, 2019): 518–39. http://dx.doi.org/10.12957/jse.2019.47382.
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This work aims to identify sedimentary and basal rocks structures in the Sepetiba Bay Basin (Rio de Janeiro State, SE Brazil) located in the western portion of Guanabara Graben formed during the course of Paleocene tectonic activity. Two distinct geophysical tools were used to investigate the geological records by the integration of geological survey and geophysical data: Ground-penetrating radar (GPR) and Ground Magnetic survey. GPR results allowed to interpret and delimit subsurface layers of the basin. It was observed in the analyzed all sections, that the most superficial layers of the radargrams (about 8 meters; with Radar 100 Mhz) the presence of clay and silty sediment layers, related to a calm depositional environment and below 8 m sandy layers related to more energetic depositional environment were found. These sedimentological changes should be influenced by sea level oscillations and marine transgressions in this area. Magnetic ground survey allowed to identify basement rocks of the Sepetiba Bay Basin and to confirm the event of sea level rise. REGISTROS DE TRANSGRESSÃO MARINHA NA REGIÃO DE SEPETIBA BAY (RJ-BRASIL). PESQUISA COM GPR E MAGNÉTICA EM TERRAResumoEste trabalho tem como objetivo identificar estruturas de rochas sedimentares e basais na Bacia da Baía de Sepetiba (Estado do Rio de Janeiro, SE Brasil), localizada na porção oeste da Guanabara Graben, formada durante o curso da atividade tectônica do Paleoceno. Duas ferramentas geofísicas distintas foram usadas para investigar os registros geológicos pela integração do levantamento geológico e dos dados geofísicos: GPR e levantamento magnético do solo. Os resultados do GPR permitiram interpretar e delimitar as camadas subterrâneas da bacia. Observou-se nas seções analisadas, que nas camadas mais superficiais dos radargramas (cerca de 8 metros; com Radar 100 Mhz) a presença de camadas de argila e sedimentos sedimentares, relacionadas a um ambiente deposicional calmo e abaixo de 8 m de camadas arenosas relacionadas a ambiente deposicional mais energético. Essas mudanças sedimentológicas devem ser influenciadas por oscilações do nível do mar e transgressões marinhas na área. O levantamento magnético do solo permitiu identificar rochas subterrâneas da Bacia da Baía de Sepetiba e confirmar o evento de elevação do nível do mar. Palavras-chave: Área costeira. Evolução da bacia sedimentar. Alterações passadas no nível do mar. Magnetometria. GPR.
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Merriman, Richard J. "Clay minerals and sedimentary basin history." European Journal of Mineralogy 17, no. 1 (March 3, 2005): 7–20. http://dx.doi.org/10.1127/0935-1221/2005/0017-0007.
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Kabbachi, Belkacem, Mohamed El Youssi, Abdelkrim Ezaidi, and Pierre Rognon. "Physiographie et dynamique sédimentaire actuelle dans la marge atlantique sud-ouest marocaine (Le bassin Tan Tan -Cap Juby) [Physiography and recent sedimentary dynamic in southwestern atlantic margin of Morocco (Tan Tan - Cape Juby basin)]." Quaternaire 12, no. 3 (2001): 139–48. http://dx.doi.org/10.3406/quate.2001.1687.
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Honegger, Belén Viera, Ethel Morales, Matias Soto, and Bruno Conti. "SEISMIC STRATIGRAPHY OF THE EOCENE–LOWER OLIGOCENE IN THE URUGUAYAN CONTINENTAL MARGIN / ESTRATIGRAFIA SÍSMICA DO EOCENO AO OLIGOCENO INFERIOR NA MARGEM CONTINENTAL URUGUAIA." Journal of Sedimentary Environments 3, no. 4 (December 31, 2018): 290–306. http://dx.doi.org/10.12957/jse.2018.39248.
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The Uruguayan continental margin was generated following the fragmentation of the Gondwana supercontinent and the subsequent opening of South Atlantic Ocean. It constitutes an extensive sedimentation area in which three sedimentary basins can be found: the Punta del Este Basin, the southernmost portion of the Pelotas Basin, and the poorly defined Oriental del Plata Basin. The aim of this work was the identification and characterization of the different seismic units (seismic facies, systems tracts, depositional sequences) for the sedimentary interval assigned to the Eocene in the Uruguayan continental margin. Sequence stratigraphy was used as a basin analysis method for this purpose, using a database that consisted of approximately 10,000 kilometers of 2D seismic sections, acquired in exploratory surveys in 2007 and 2008. The workflow included the recognition of stacking patterns and/or stratal terminations, the definition of genetically significant stratigraphic surfaces and, based on these, the identification of systems tracts and depositional sequences. Three depositional sequences were identified in the studied sedimentary interval. The basal sequence is composed of four depositional systems tracts, including falling stage, normal regression (lowstand and highstand) and transgressive deposits. The intermediate sequence only preserves lowstand normal regression deposits. The third sequence is composed by three depositional systems tracts, including lowstand, transgressive and falling stage deposits. ResumoA margem continental uruguaia foi gerada após a fragmentação do supercontinente Gondwana e a subsequente abertura do Oceano Atlântico Sul. Constitui uma extensa área de sedimentação em três bacias sedimentares: a bacia de Punta del Este, a porção mais ao sul da Bacia de Pelotas e a Bacia Oriental del Plata, pouco definida. O objetivo deste trabalho foi a identificação e caracterização das diferentes unidades sísmicas (fácies sísmicas, tratos de sistemas, seqüências deposicionais) para o intervalo sedimentar atribuído ao Eoceno na margem continental uruguaia. Com este objetivo, utilizou-se a estratigrafia de seqüencias como método de análise de bacias, tendo-se utilizado um banco de dados constituído por aproximadamente 10.000 km de seções sísmicas 2D, adquiridas em pesquisas exploratórias em 2007 e 2008. O trabalho incluiu o reconhecimento de padrões de empilhamento e/ou terminações estratais, a definição de superfícies estratigráficas geneticamente significativas, tendo-se efetuado com base nelas, a identificação de tratos de sistemas e seqüências deposicionais. Três seqüências deposicionais foram identificadas no intervalo sedimentar estudado. A seqüência basal é composta por quatro tratos de sistemas deposicionais, incluindo a fase de abaixamento do nível do mar, a regressão normal e depósitos transgressivos. A sequência intermediária apenas preserva os depósitos de regressão normais de nível de mar baixo. A terceira seqüência é composta por três tratos de sistemas deposicionais, incluindo depósitos de nível de mar baixo, transgressivos e de abaixamento do nível do mar.
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Wächter, Jacob, Christian Olaf Mueller, and Alexander Malz. "3D temperature modelling in deep sedimentary basins – A case study from Altmark region (North German Basin)." Zeitschrift der Deutschen Gesellschaft für Geowissenschaften 173, no. 2 (September 30, 2022): 275–98. http://dx.doi.org/10.1127/zdgg/2022/0299.
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Orth, Paul, Jean François Pastre, Agnès Gauthier, Nicole Limondin-Lozouet, and Stephane Kunesch. "Les enregistrements morphosédimentaires et biostratigraphiques des fonds de vallée du bassin-versant de la Beuvronne (Bassin parisien, Seine-et-Marne, France) : perception des changements climatoanthropiques à l'Holocène[ Holocene morpho-sedimentary and bio-stratigraphy records from alluvial fills of the Beuvronne river catchment (Paris basin, France): perception of climatic changes and human activities. ]." Quaternaire 15, no. 3 (2004): 285–98. http://dx.doi.org/10.3406/quate.2004.1775.
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Duarte, Luis Vitor, Manfred Krautter, and Antonio Ferreira Soares. "Bioconstructions a spongiaires siliceux dans le Lias terminal du Bassin lusitanien (Portugal); stratigraphie, sedimentologie et signification paleogeographique." Bulletin de la Société Géologique de France 172, no. 5 (September 1, 2001): 637–46. http://dx.doi.org/10.2113/172.5.637.
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Abstract The Upper Liassic series in the western border of Iberia (Lusitanian Basin, Portugal), show an important lutitic sedimentation, characterized generally by a monotonous marl/limestone alternation. Small scale siliceous sponge mudmounds occur in these deposits from Middle Toarcian to Lower Aalenian age. The scope of this work is to pinpoint the stratigraphical and sedimentological context and to characterize controlling factors of the spongioliths. Stratigraphic and facies analysis. Relevant sections were observed and investigated in different locations of the Lusitanian Basin (e.g., Alvaiazere, Porto de Mos, Rabacal, Coimbra and Cantanhede) (fig. 1). The siliceous sponge facies correspond to the upper part of the S. Giao Unit and to the lower part of the Povoa da Lomba Unit (fig. 2). Considering the sequential scheme of Duarte [1997], the sediments correspond to groups of third-order depositional sequences MST3 and MST4 (mainly in the upper part of this sequence: MST4B). The sedimentary evolution of these units shows a stacking pattern composed of shallowing upward sequences deposited in an outer homoclinal ramp setting, dipping northwestwards. Both units increase in thickness from south to north (fig. 3) and their vertical facies associations correspond to a very bioturbated (Chondrites, Zoophycos, Planolites and Thalassinoides) marl/limestone succession (figs. 4 and 5). MST3 is demonstrably more marly than MST4B. The base of MST4 [MST4A in Duarte, 1997] corresponds to a marl/marly limestone alternation, very poor in siliceous sponge mudmounds. The first unit (MST3) which includes sponge mudmounds is dated as uppermost Bifrons zone through the base of the Bonarellii zone. The majority of the siliceous sponge mudmounds occur within this time slice. These mounds are characterized by a great diversity of accompanying fauna mainly composed of brachiopods (rhynchonellids and terebratulids), crinoids and bivalves. The initial growth of the sponge build-ups can be correlated basin-wide to the intra Bifrons regional flooding surface (MST2/MST3 boundary). The second unit (MST4), particularly its upper part (MST4B), corresponds to the top of the Meneghinni-Opalinum interval and is related to a carbonate progradational phase. In the eastern part of the basin, the calcareous facies of MST4B are more bioclastic. Siliceous sponge mudmounds. The Toarcian mudmounds of the Lusitanian Basin are usually only a few decimetres thick and most display irregular knob-like to flat lenticular morphologies. Some build-ups are round and can reach 1,5 metres in thickness and ten metres in diametre. Also worth mentioning is a siliceous sponge biostrome developed at the base of MST3 in the Porto de Mos section (figs. 3 and 6). The upper mound surface is normally rough and uneven. In both sequences they are always related laterally with carbonate beds, which corresponds to the top of fourth order sequences. The mudmounds consist of mostly brownish iron-rich calcified siliceous sponges and a greyish, sometimes peloidal allochthonous micritic matrix. In general, the sponges themselves consist of dense leiolitic microbolites [automicrites sensu Reitner and Neuweiler, 1993]. The sponge spicules are diagenetically transformed into calcite. The great majority of the sponge specimens belong to the Hexactinosa (Class Hexactinellida) and are unknown and undescribed to date. "Lithistides" (polyphyletic desma-bearing demosponges) are very rare and only occur as forms encrusting Hexactinosan sponges. The benthic macrofauna is abundant and consists of monospecific crinoids, rhynchonellids, terebratulids and bivalves (mainly pectinids and ostreids). Encrusting organisms are serpulids, bryozoans and foraminifera, as well as "Lithistids" mentioned above. They are entirely restricted to the stratonomical surfaces of the siliceous sponges. The sponge bioherms consist of several microfacies types (wackestones, packstones, floatstones and boundstones). All of them are micrite dominated and represent low energy environments. They differ mainly in the amount of siliceous sponges, micrite, microbialites and the accompanying fauna. Palaeoenvironmental significance. The amount of microbial induced carbonate clearly mirrors the importance of microbial activity in respect of the reef building potential. Furthermore, three other controlling factors played an important role in the initiation of the siliceous sponge mudmounds of the Lusitanian Basin: bathymetry, sea-floor morphology and sedimentation rate. The role of the first two factors is evident because the siliceous sponge mudmounds are particularly important (abundance and volumetric expression) in the eastern part of the basin (Rabacal-Alvaiazere region). They are practically absent towards the west (essentially in MST4B) where the series show hemipelagic sedimentologic features (figs. 7 and 8). Reduced sedimentation rate is a precondition for the settlement of siliceous sponges and Hexactinosa in particular. Compared to all other Toarcian sequential units, MST3 and MST4B are the thinnest and therefore reflect the lowest sedimentation rates (fig. 8).
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Doig, Ronald, J. Brendan Murphy, and R. Damian Nance. "U–Pb geochronology of Late Proterozoic rocks of the eastern Cobequid Highlands, Avalon Composite Terrane, Nova Scotia." Canadian Journal of Earth Sciences 28, no. 4 (April 1, 1991): 504–11. http://dx.doi.org/10.1139/e91-044.
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In the Cobequid Highlands of Nova Scotia, low-grade late Precambrian arc-related volcano-sedimentry rocks typical of the Avalon Composite Terrane overlie platformal metasedimentry rocks and are spatially associated with gneisses previously considered to be basement to both these units. U–Pb zircon dates of 580–587 Ma from an orthogneiss and an amphibolite are similar to the U–Pb zircon dates of 580–610 Ma from both syntectonic granites in ductile shear zones and high-level posttectonic plutons that intruded the Avalonian successions. Hence, the gneisses do not represent basement but are an integral part of the Avalonian orogenic cycle. The geochronological data indicate that penetrative fabrics in the gneisses, syntectonic granites, and volcano-sedimentary successions are penecontemporaneous (ca. 580–620 Ma) and not sequential, as previously interpreted. The gneisses have a metamorphic fabric (S1a), crystallized under amphibolite-facies conditions, and may represent the deeper roots of a late Precambrian magmatic arc. Fabrics within the deformed granite gneisses (S1b) are interpreted as reflecting crystallization within active ductile shear zones associated with intra-arc transtension and basin development. Fabrics in the volcano-sedimentary successions (S1c) are associated with deformation of the basin.
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Xiang, Jianbo, Xianghui Zhang, Jiale Liu, Qinghao Meng, Yu Zhang, and Xinglu Li. "Characterization and Modernization of the Depositional System in Modern Ebinur Lake Basin, Northwest China." Applied Sciences 14, no. 11 (May 23, 2024): 4425. http://dx.doi.org/10.3390/app14114425.
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The Ebinur Lake Basin is a typical terrestrial sedimentary Basin in Northwest China that has developed a piedmont distributive fluvial system (DFS) sedimentary environment, lake sedimentary environment, and desert sedimentary environment. The Ebinur Lake receives the sediments carried by the rivers in the basin and is the regional sedimentary center. In this study, a division scheme of modern sedimentary system tracts in the Ebinur Lake Basin was proposed. According to the landform, sedimentary environment, structure, and sedimentary system types, the Ebinur Lake Basin was divided into five system tracts. The area with high altitude and steep gradients mainly develops the rapid sedimentary system DFS, and the area with the lowest altitude in the region develops the lake sedimentary system. The main action area of climate drought and wind field is the dune sedimentary area. The wind field under the influence of hydrological climate and geomorphology has an important influence on the distribution of the sedimentary system tract. The structure determines the development of different types of sedimentary systems by controlling the topographic fluctuation and sedimentary space. Hydroclimate and geomorphology affect the development of sedimentary systems by controlling the sediment source rate in the sedimentary area. Based on the analysis of the characteristics and distribution of the modern sedimentary system in the Ebinur Lake Basin, a method for determining the level of the sedimentary system of the Ebinur Lake was established together with a plane model of the sedimentary system of the Ebinur Lake, which provides a reference for the study of the sedimentary system of continental basins.
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Sunarjanto, Djoko, Sri Wijaya, Suprajitno Munadi, Bambang Wiyanto, and Doma F. Prasetio. "INDONESIAN TERTIARY SEDIMENTARY BASIN." Scientific Contributions Oil and Gas 31, no. 2 (March 21, 2022): 19–27. http://dx.doi.org/10.29017/scog.31.2.1002.
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Since 1980 the number of Indonesian Sedimentary Basin which is officially announced by the government are 60 basins, but informally the variation in the range of less than 60 up to around 66 basins. Based on stratigraphic and tectonics conditions of some areas there are overlapping layers between Tertiary Sedimentary and Pre Tertiary Basin. In general the definition of a sedimentary basin is a region, part of the earth's crust where sedimentary strata have been deposited in a relatively much greater thickness than its surrounding area. The nomenclature for basin is referred more to basinal areas. Based on sedimentary basin classification there are: type of plate where basin exists, basin position in the plate margin, type of plate interaction, time development of basin and basins fill with respect to tectonic and shape of the basin. The updating classification using new technology and knowledge of the basin, can also update previous knowledge because of the limitation of the data and the lack of new concept when the report was published. 63 Tertiary Sedimentary Basins (16 producing basin of oil and gas, 8 drilled basin with discovery, 15 drilled basin with has no discovery yet and 24 basin which has not been drilled yet) could be used as a basic data for development of science and technology, to support government policy and investor, to improve and accelerate oil and gas exploration and production in Indonesia.
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Ferdinand, Yao Diby, Assale Fori Jean Paul, Alla Amani Jonas, and Digbehi Zeli Bruno. "Caracterisasion Geochimique des Deblais du Substratum de la Baie du Banco, Abidjan, Basse Cote d‘Ivoire." European Scientific Journal, ESJ 19, no. 36 (December 31, 2023): 124. http://dx.doi.org/10.19044/esj.2023.v19n36p124.
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L’étude géochimique réalisée s’est éffectuée sur les déblais du substratum de la baie du Banco situé au Sud-est du bassin sédimentaire côtier de la Côte d’Ivoire. Cette étude vise à caractériser le substratum de la baie du Banco à partir des éléments chimiques ainsi que la détermination des paléoconditions des environnements de dépôt. La spectrométrie par fluorescence à rayon x (XRF) a permis de déterminer les éléments majeurs ainsi que des éléments traces présents dans les lutites noirâtres du substratum de la baie. Les éléments majeurs identifiés sont par ordre décroissant le Silicium (45,33 %), le Fer (35,56 %), l’Aluminium (9,24 %), le Potassium (2,31 %), le Calcium (2,22 %), le Titane (2 ,15 %), le Chlore (2,04 %) et le Phosphore (1,12 %). L’analyse géostatistique a permis de mettre en évidence de fortes corrélations entre la matière organique et le fer réduit (Fe 2+), l’étain (Sn), l’arsenic (As) et le soufre (S). Le substratum de la baie du Banco est caractérisé par une forte concentration en soufre variant de 12475 à 75752 ppm et une bioproductivité primaire plus importante en profondeur qu’en surface. Les éléments traces U, V et Mo ont permis d’identifier un milieu euxinique à interface eau-sédiment en subsurface du substratum (0- 32 m) tandis qu’en fin de forage (78-80 m), on distingue un milieu suboxique à anoxique. Ces différents résultats ont permis de caractériser le substratum de la baie du Banco.
The geochemical study was carried out on cuttings from the Banco Bay bedrock in the southeastern part of the Côte d'Ivoire coastal sedimentary basin. The study aimed to characterize the Banco Bay bedrock based on chemical elements and to determine the paleo conditions of the depositional environments. X-ray fluorescence spectrometry (XRF) was used to determine the major and trace elements present in the blackish lutites of the bay bedrock. The major elements identified were, in descending order, Silicon (45.33%), Iron (35.56%), Aluminium (9.24%), Potassium (2.31%), Calcium (2.22%), Titanium (2.15%), Chlorine (2.04%) and Phosphorus (1.12%). Geostatistical analysis revealed strong correlations between organic matter and reduced iron (Fe 2+), tin (Sn), arsenic (As), and sulfur (S). The Banco Bay bedrock is characterized by high sulfur concentrations ranging from 12475 to 75752 ppm, and higher primary bioproductivity at depth than at the surface. Trace elements U, V, and Mo identified an euxinic environment at the water-sediment interface in the subsurface of the bedrock (0-32 m), while at the end of the borehole (78-80 m), a suboxic to anoxic environment was distinguished. These results have enabled us to characterize the bedrock of the Banco Bay.
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Ilboudo, Adama, Maurice Ouango Savadogo, Fidèle Kabore, Der Some, Joseph Nomwindé Kabore, Edmond Hien, and Salifou Traore. "Typologie et caractérisation morphopédologique des sols de bas-fonds soudano-sahéliens : cas du sous-bassin versant du Nakanbé-Dem au Centre-nord du Burkina Faso." International Journal of Biological and Chemical Sciences 17, no. 3 (August 24, 2023): 1269–87. http://dx.doi.org/10.4314/ijbcs.v17i3.39.
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Dans la zone soudano-sahélienne Burkinabè, la population locale est plus dépendante des bas-fonds dont l’exploitation s’est accrue au cours de ces dernières décennies. Cette étude a pour objectif d’analyser les caractéristiques morphopédologiques des sols de bas-fonds du sous-bassin versant du Nakanbé-Dem situé dans la partie Sud du sahel. Des échantillons rocheux ont été prélevés et des analyses microscopiques en ont été effectuées. Des fosses pédologiques ont été ouvertes, des échantillons de sol de bas-fonds ont été effectués et analysés au laboratoire. Les données collectées ont été analysées à l'aide du logiciel R et statistiquement évaluées par des analyses de variances (ANOVA). Les résultats ont montré que le type morphologique de bas-fond est fonction du milieu géologique. La fertilité chimique du sol est plus élevée en milieu volcano-sédimentaire (0,82) qu’en milieu plutonique (0,78). Quatre classes de sols ont été recensées : les sols peu évolués, les sols ferrugineux tropicaux lessivés, les sols brunifiés et les sols hydromorphes. Leur répartition est en fonction des sous unités géomorphologiques des bas-fonds. Il existe une corrélation positive entre le degré de fertilité chimique du sol et les sous unités géomorphologiques des bas-fonds. Les sols de zones centrales sont de fertilité plus élevée que ceux des versants et des glacis. L’étude a souligné la fertilité faible à moyenne des sols de bas-fonds. Elle suggère la nécessité d’en tenir compte dans la valorisation agricole des bas-fonds soudano-sahéliens dans un contexte de pluviosité limitée
English title: Typology and morphopedological characterization of the soils of the Sudano-Sahelian lowlands: case of the Nakanbé-Dem sub-watershed in the Center-North of Burkina Faso
In the Sudano-Sahelian zone of Burkina Faso, local population is more dependent on lowlands. Lowlands exploitation has increased in recent decades. This study analyzes morphopedological characteristics of soils lowland of the Nakanbé-Dem sub-watershed, located in the sahel southern part. Rock samples were taken and microscopic analyzes were carried out. Soil pits were opened, bottomland soil samples were taken and analyzed in the laboratory. The data collected was analyzed using R software and statistically evaluated by analysis of variance (ANOVA). The results showed lowland morphological type is function of geological environment. Soil chemical fertility is higher in a volcano-sedimentary environment (0.82) than in plutonic environment (0.78). Four soils classes have been identified: poorly evolved soils, leached tropical ferruginous soils, brown soils and hydromorphic soils. Their distribution is based on the lowlands geomorphological subunits. There is positive correlation between degree of soil chemical fertility and lowlands geomorphological subunits. Central zone soils are higher fertility than those of the slopes and glacis. The study highlighted low fertility soils lowland. It suggests the need to take this into account in the agricultural development of Sudano-Sahelian lowlands in context of limited rainfall.
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Russo, Antonio, Getaneh Assefa, and Balemwal Atnafu. "Sedimentary evolution of the Abay River (Blue Nile) Basin, Ethiopia." Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 1994, no. 5 (May 1, 1994): 291–308. http://dx.doi.org/10.1127/njgpm/1994/1994/291.
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Ilboudo, Adama, Mamoudou Traore, Edmond Hien, and Zombre Prosper. "Dynamique de la Macrofaune des Bas-fonds Soudanosaheliens dans un Contexte de Changement Climatique: Étude de Cas dans le Sous-bassin Versant du Nakanbé-Dem au Centre-nord du Burkina Faso." European Scientific Journal, ESJ 19, no. 3 (January 31, 2023): 29. http://dx.doi.org/10.19044/esj.2023.v19n3p29.
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La dégradation des bassins versants est une preuve du changement environnemental que connait l’Afrique de l’ouest. Elle s‘exprime par la dégradation des sols de bas-fonds qui demeure une préoccupation récurrente dans les pays sahéliens comme le Burkina Faso. Cette étude qui analyse la dynamique de la macrofaune des sols de bas-fonds, a pour objectif de contribuer à la gestion durable des bas-fonds du sous-bassin du Nakanbé-Dem dans la zone soudano-sahélienne Un échantillonnage spatialisé de la macrofaune du sol par la méthode TSBF a été réalisé pour analyser les principaux facteurs explicatifs de la variabilité spatiale de la macrofaune dans les bas-fonds. La fertilité chimique des sols de bas-fonds en milieu plutonique est faible par rapport au degré moyen de la fertilité des sols de bas-fonds en milieu de l’ensemble volcano sédimentaire. L’évaluation de la macrofaune du sol a révélé que les indices de diversité les plus élevés ne dépassent guère 2,40 ± 0,09 pour Shannon et 1,09± 0,02 pour Piélou. La plus grande proportion de la macrofaune est relevée dans les profondeurs de plus de 20 cm du sol. L’étude a relevé un état dégradé des bas-fonds dont les sols sont de fertilité basse à moyenne. La restauration des écosystèmes de ces bas-fonds nécessite une correction des éléments déficitaires si l’on veut gérer durablement les sols de ces bas-fonds.
The degradation of watersheds proves the environmental change West Africa is experiencing. It is expressed by the degradation of lowland soils which remains a recurring concern in Sahelian countries such as Burkina Faso. This study analyzes the dynamics of the macrofauna of lowland soils and has the main objective of contributing to the sustainable management of lowlands in the Sudano-Sahelian zone. It was conducted in the Nakanbé-Dem sub-watershed in the Center-North of Burkina Faso. The morphological and chemical parameters of lowland soils were determined by the method of soil prospecting according to the top sequence of the lowland including the glacis, the slope, and the central zone. A spatialized sampling of the soil macrofauna by the TSBF method was carried out to analyze the main explanatory factors of the spatial variability of the macrofauna in the lowlands. The chemical fertility of lowland soils in a plutonic environment is low compared to the average degree of fertility of lowland soils in the middle of the sedimentary volcano complex. The evaluation of the soil macrofauna revealed that the highest diversity indices hardly exceed 2.40 ± 0.09 for Shannon and 1.09 ± 0.02 for Piélou. The most significant proportion of macrofauna is found in depths of more than 20 cm from the ground. The study noted a degraded state of the lowlands whose soils are of low to medium fertility. Restoring the ecosystems of these lowlands requires a correction of the deficit elements if we want to sustainably manage the soils of these lowlands.
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Boruah, Annapurna. "Unconventional Shale Gas Prospects in Indian Sedimentary Basins." International Journal of Scientific Research 3, no. 6 (June 1, 2012): 35–38. http://dx.doi.org/10.15373/22778179/june2014/181.
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Patrikeev, P. A., and A. V. Akhiyarov. "Pre-Mesozoic sediments of the Tunguska sedimentary basin complicated by the products of intrusive trap magmatism: Hydrocarbon potential, development issues and their solutions." Actual Problems of Oil and Gas, no. 41 (September 14, 2023): 227–45. http://dx.doi.org/10.29222/ipng.2078-5712.2023-41.art16.
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The sedimentary basin examined in this paper is the largest of the three main basins of the Siberian Platform: the Tunguska (S > 1.2 million km2), the Irkutsk (S = 825 thousand km2) and the Pre-Verkhoyansk-Vilyui (according to various estimates, from 280 to 350 thousand km2). Meanwhile, in the Tunguska sedimentary basin area (as of 01.01.2023), only seven hydrocarbon fields have been discovered (quite insignificant in terms of reserves), which is a fairly modest result in comparison to the other two above-mentioned sedimentary basins (much smaller in area) and cannot be explained by the fact that the Tunguska sedimentary basin is poorly studied in terms of oil and gas geology prospecting criteria. Despite the considerable amount of information on the geological structure of the Tunguska sedimentary basin obtained during geological surveying, prospecting and thematic works; special studies devoted to detailed structural and facies analysis and the history of formation of the Permian–Triassic intrusive stratum, all of the above is clearly insufficient. The correlation of the northern and southern types of sections of this stratum is also insufficiently developed, considering the role of facies substitution of the tuffs from the southern part of the Tunguska sedimentary basin by the lavas of its northern territories. Regional studies concerning the identification of magmatic activity centers and determination of the main types of natural mechanisms that initiated the global process of trap magmatism are insufficiently presented. The appearance in recent years of the new data on the little- studied areas of the Putorana Plateau in the north of the sedimentary basin made it possible to create a more comprehensive picture and begin to study the history of the formation of the volcanic strata of the entire sedimentary basin. Thus, despite the relatively poor geological study of the Tunguska sedimentary basin and the presence of traps (reservoir and transgressive intrusions) in the section, the oil and gas prospects of this sedimentary basin can be assessed rather optimistically. Most of the predicted and potential hydrocarbon resources are associated with the Vendian–Lower Cambrian and Riphean complexes.
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Spalletti, Luis A. "Evolución sedimentaria de una cuenca pull apart: la cuenca de Nirihuau (Oligoceno - Mioceno), flanco oriental de los Andes Patagónicos, Argentina." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 181, no. 1-3 (December 10, 1990): 171–88. http://dx.doi.org/10.1127/njgpa/181/1990/171.
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Zhiguo, Wang. "Study on sedimentary facies characteristics of Xujiahe Formation in Sichuan Basin." E3S Web of Conferences 290 (2021): 02022. http://dx.doi.org/10.1051/e3sconf/202129002022.
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Sedimentary facies is the summation of all primary sedimentary features in a sedimentary unit, which is the product of sedimentation in a specific environment. It emphasizes the material performance of sediment formation conditions, including mineralogy, petrology, paleontology, geochemistry and geophysics. Therefore, it has unique sedimentary features in this environment. In this paper, the types and units of sedimentary facies which can reflect the basic characteristics and geometry of sedimentary system are established, and based on the comprehensive analysis of rock types, lithological assemblages, sedimentary structures, palaeontological assemblages and section structures, the sedimentary facies types of Xujiahe formation of Upper Triassic in the study area mainly include semi-arid flooded basin facies, delta facies, beach bar-lagoon system and lake facies, among which delta facies and beach bar-lagoon system are the main sedimentary facies types. Because sedimentary facies is the historical product of basin formation, evolution and extinction, it can not only reflect the formation conditions, temporal and spatial distribution and evolution law of related strata and rock types, but also be the basis for analyzing the nature and structural background of sedimentary basin. At the same time, the analysis of sedimentary facies is of great significance for understanding and analyzing the evolution history of basin and guiding the exploration and development of related oil and gas resources.
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LONI, Soudeh, and Mahmoud MEHRAMUZ. "Gravity field inversion using Improved Particle Swarm Optimization (IPSO) for estimation of sedimentary basin basement depth." Contributions to Geophysics and Geodesy 50, no. 3 (September 22, 2020): 303–23. http://dx.doi.org/10.31577/congeo.2020.50.3.2.
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In this paper, for the first time an Improved Particle Swarm Optimization (IPSO) algorithm, is developed to evaluate the 2.5-D basement of sedimentary basin and consequently to simulate its bottom, by using the density contrast that varies parabolically with depth simultaneously. The IPSO method is capable of improving the global search of particles in all of the search fields. Finding the optimum solution is adjusted by an inertia weight and acceleration coefficients. Here, we have examined the ability of the IPSO inversion by the synthetic gravity data due to a sedimentary basin, with and without noise. The calculated depth and gravity of the synthetic model do not differ too much from assumed values due to set limits for model parameters and are always within the range. Also, the mentioned method has been applied for the 2.5-D gravity inverse modelling of a sedimentary basin in Iran. We also have modelled the sedimentary basin in 2-D along seven profiles. Furthermore, using the depth values estimated by IPSO from all profiles, a 3-D model of the sedimentary basin was generated. The obtained maximum depth for this sedimentary basin is 2.62 km.
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Garba, Zibo, Alain Durand, and Jacques Lang. "Enregistrement sédimentaire de l'activité éolienne et de l'aridité pendant la transition Tardiglaciaire-Holocène à la limite Sahara/Sahel Termit, bassin du lac Tchad [Sedimentary record ofaeolian processes and aridity during the Late-Gtacial/Hotocene transition at the Sahara/Sahel boundary (Termit, Lake Chad basin).)]." Quaternaire 6, no. 2 (1995): 91–98. http://dx.doi.org/10.3406/quate.1995.2042.
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Deng, Mo, Guowei Zhao, Xiaobing Lin, Chunyu Chen, Longlong Li, and Qingshao Liang. "Sedimentary Facies, Paleogeography, and Depositional Models of the Middle–Late Permian in the Sichuan Basin, Southwest China." Minerals 13, no. 11 (November 1, 2023): 1406. http://dx.doi.org/10.3390/min13111406.
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This study focuses on the analysis of the sedimentary facies of the Middle–Late Permian, including the Qixia, Maokou, Wujiaoping/Longtan, and Changxing/Dalong Formations, in the Sichuan Basin, southwest China. Integrating drilling data and field outcrop data, various sedimentary facies indicators were employed to define eight sedimentary facies types in the Sichuan Basin during the Middle–Late Permian, namely, mixed tidal flat, tidal flat, restricted platform, open platform, platform margin, slope, basin, and volcanic facies. Detailed facies analysis was conducted on selected well logs, and sedimentary facies distribution maps were compiled for different time intervals, establishing depositional models. During the Qixia to Maokou stages, an extensive open platform was developed in the Sichuan Basin, accompanied by shallow intra-platform shoals. Towards the west along the Dayi–Ya’an line, platform margins were developed, followed by slope facies and basin facies in a northwest direction. During the Changxing stage, the Kaijiang–Liangping fault block subsided, forming the “Kaijiang-Liangping” paleochannel, which controls reef–shoal deposition in the region. This study provides comprehensive insights into the sedimentary facies characteristics and depositional environments of the Middle–Late Permian in the Sichuan Basin, contributing to the understanding of the regional sedimentary history and geological evolution.
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Ershov, S. V., A. E. Kontorovich, N. I. Shestakova, Jin Zhijun, A. K. Kartashova, and M. N. Shaporina. "GEOLOGICAL STRUCTURE OF THE ZEYA-BUREYA SEDIMENTARY BASIN BASED ON THE RESULTS OF INTEGRATED INTERPRETATION OF DRILLING DATA AND SEISMIC STRATIGRAPHY." Tikhookeanskaya Geologiya 42, no. 5 (2023): 76–91. http://dx.doi.org/10.30911/0207-4028-2023-42-5-76-91.
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This study summarizes the most recent geological and geophysical data on the Zeya-Bureya sedimentary basin (Russian Far East). The stratigraphy of the sedimentary cover is described. A comparative analysis of the Zeya-Bureya sedimentary basin and the Songliao basin (China) to the south of it, which is similar in its tectonic nature, structure and geological history, indicates that the Ekaterinoslavka Formation, occurring at the base of the sedimentary cover and formerly assigned to the Jurassic, is Lower Cretaceous in age. Results of the reinterpretation of the old CDP data (2014–2018) were used to infer the seismostratigraphic characteristics of the section and to identify six geoseismic sequences. The wave pattern of the constructed sections confirms the synrift nature of the grabens at the base of the sedimentary cover of the Zeya-Bureya sedimentary basin. Thickness maps of Cretaceous formations and a tectonic map of the sedimentary cover were compiled from the core and deep drilling data as well as 2D and 3D CDP seismic survey data taking into account the integrated interpretation of gravity, magnetic, and geological survey data. The evolution of the study area is divided into four stages: synrift, early syneclise, late syneclise, and neotectonic.
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Kazanci, Nizamettin, and Oğuz Erol. "Sedimentary characteristics of a Pleistocene fan-delta complex from Burdur basin, Turkey." Zeitschrift für Geomorphologie 31, no. 3 (September 30, 1987): 261–75. http://dx.doi.org/10.1127/zfg/31/1987/261.
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Santillán-Piña, Noé, and Joaquín Eduardo Aguayo-Camargo. "Facies sedimentarias turbidíticas del Terciario Inferior en la Cuenca de Chicontepec, Centro-Oriente de México." Ingeniería, investigación y tecnología 12, no. 3 (July 1, 2011): 337–52. http://dx.doi.org/10.22201/fi.25940732e.2011.12n3.034.
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LYUBOV V., GLEBOVA, CHI QINGYUAN, and SEREBRYAKOV ANDREY O. "REGIONAL GEOLOGICAL STUDIES OF DOME-SHAPED UPLIFTS OF THE TARIM SEDIMENTARY BASIN." Geology, Geography and Global Energy 81, no. 2 (2021): 31–41. http://dx.doi.org/10.21672/2077-6322-2021-81-2-031-041.
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He regional geological study of the Tarim sedimentary basin, located in the tectonic zone of the Donkhetang fault, is of national interest. The Tarim sedimentary basin is an ultradeep and complex basin. A number of anticline structures are confined to the central part of the Tabei uplift. In the structure of the tectonic belt, two inversion faults take part, with the formation of a structural nose. Domed uplifts lie at a depth of 6000 meters, the thickness of the prospective layers reaches 20 meters. Combining regional geological studies and the results of sedimentary facies studies, the rocks of the prospective formations are a transgressively controlled sandstone layer, which uses the environment of deltaic sediments as a background. Based on the results of modern sedimentary studies, the characteristics of the Donghae sandstone are analyzed. To study the Tarim sedimentary basin, a complex of regional studies related to the geological study, the tectonic structure of the region, lithological-stratigraphic studies, sequence-stratigraphic studies, studies of the physical and reservoir properties of rocks, regional studies of the thickness, uniformity and strike of the studied layers was carried out. The main target objects are a group of reservoirs of the Jurassic and Carboniferous periods. Proven geological reserves of oil and gas have been recorded in the Tarim sedimentary basin.
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DALY, M. C. "Principles of Sedimentary Basin Analysis." Geophysical Journal International 105, no. 3 (June 1991): 812. http://dx.doi.org/10.1111/j.1365-246x.1991.tb00820.x.
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Stanton, Robert J. "Principles of Sedimentary Basin Analysis." Eos, Transactions American Geophysical Union 66, no. 25 (1985): 498. http://dx.doi.org/10.1029/eo066i025p00498-01.
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Wolf, K. H. "Principles of sedimentary basin analysis." Earth-Science Reviews 22, no. 3 (November 1985): 253–57. http://dx.doi.org/10.1016/0012-8252(85)90076-5.
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Freiman, S. I., A. M. Nikishin, and E. I. Petrov. "Cenozoic clinoform complexes and geological history of the North-Chukchi basin (Chukchi sea, Arctic)." Moscow University Bulletin. Series 4. Geology, no. 4 (August 28, 2019): 11–19. http://dx.doi.org/10.33623/0579-9406-2019-4-11-19.
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New sesmostratigraphic model has been established for the sedimentary cover of the North-Chukchi basin. Based on the model interpretation of the main paleogeographic events within the territory was performed. We identify three stage in the post-rift sedimentary history of the North-Chukchi basin: Late Cretacerous to Paleocene stage when strong progradation of shelf sedimentary packages was occurred, Mid Eocene — Miocene, with gradual infilling of the basin from different sides and Late Miocene to Present stage with present shapes of the shelf and slow clinoform complex aggradation.
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Thinh, N. T. "Petroleum Potential in the Center of Song Hong Basin of the Northern Continental Shelf Vietnam." Oil and Gas Technologies 132, no. 1 (2021): 25–29. http://dx.doi.org/10.32935/1815-2600-2021-132-1-25-29.
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The sedimentary basin Song Hong is one of the largest Cenozoic oil and gas bearing sedimentary basins, in which the center of the basin covers a large part. It elongates from block 105 to block 115. This article presents the geological structure, history of geological development, oil and gas potential and characteristics of reservoirs f the central basin, where the thickness of the basin deposits reaches more than 16 000 m.
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Teitz, H. H. "THE OGADEN BASIN, ETHIOPIA: AN UNDEREXPLORED SEDIMENTARY BASIN." Journal of Petroleum Geology 14, no. 1 (January 1991): x—xii. http://dx.doi.org/10.1111/j.1747-5457.1991.tb00292.x.
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Barka, J., and A. Nur. "2D modelling of high resolution aeromagnetic data over northern sector of Bida basin north-central Nigeria." Applied Journal of Physical Science 2, no. 4 (October 30, 2020): 89–99. http://dx.doi.org/10.31248/ajps2020.032.
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The study was carried out in the northern sector of Bida basin. The study focuses on mapping depths to magnetic basement and basement structural framework that may assist in delineating overlying sedimentary sections that have prospect for hydrocarbon exploration. High resolution aeromagnetic data of the study area was subjected to regional residual separation, analytic signal and 2D modeling using Oasis Montaj geo-software. Results of the analytic signal demarcated the basement/sedimentary contact, interpretation of 2D geologic models revealed a horst and graben structures underlying the sedimentary formations in the northern sector of Bida basin. The graben structures having sedimentary fills to a depth greater than 2 km were viewed as favourable sites for source rock development. In view of the aforementioned areas around Bakoni, northeast of Tshipo, Enagi and southwest of Wuya with thick sedimentary piles were recommended for further application of other geophysical methods of better resolving power to explore the area for hydrocarbon; since the basin has potentials for hydrocarbon generation.
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Kováč, Michal, Rastislav Synak, Klement Fordinál, Peter Joniak, Csaba Tóth, Rastislav Vojtko, Alexander Nagy, Ivan Baráth, Juraj Maglay, and Jozef Minár. "Late Miocene and Pliocene history of the Danube Basin: inferred from development of depositional systems and timing of sedimentary facies changes." Geologica Carpathica 62, no. 6 (December 1, 2011): 519–34. http://dx.doi.org/10.2478/v10096-011-0037-4.
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Late Miocene and Pliocene history of the Danube Basin: inferred from development of depositional systems and timing of sedimentary facies changesThe development of the northern Danube Basin (nDB) was closely related to the Late Miocene geodynamic evolution of the Pannonian Basin System. It started with a wide rifting which led to subsidence of several basin depocenters which were gradually filled during the Late Miocene and Early Pliocene. In the Late Pliocene the subsidence continued only in the basin's central part, while the northern marginal zone suffered inversion and the uplifted sedimentary fill began to be eroded. Individual stages of the basin development are well recorded in its sedimentary succession, where at least three great tectono-sedimentary cycles were documented. Firstly, a lacustrine cycle containing Lower, Middle and lowermost Upper Pannonian sediments (A-F Zones;sensuPapp 1951) deposited in the time span 11.6-8.9 Ma and is represented in the nDB in Slovakia by the Ivanka and Beladice Formations. In the Danube Basin of the southern part in Hungary, where the formations are defined by the appearance of sedimentary facies in time and space, the equivalents are: (1) the deep-water setting marls, clays and sandy turbidites of the Endrod and Szolnok Formations leading to the overlying strata deposits of the basin paleoslope or delta-slope represented by the Algyő Formation, and (2) the final shallow-water setting deposits of marshes, lagoons and a coastal and delta plain composed of clays, sands and coal seams, represented by the Újfalu Formation. The second tectono-sedimentary cycle was deposited in an alluvial environment and it comprises the Upper Pannonian (G and H Zones;sensuPapp 1951) and Lower Pliocene sediments dated 8.9-4.1? Ma. The cycle is represented in the nDB, by the Volkovce Formation and in the southern part by the Zagyva Formation in Hungary. The sedimentary environment is characterized by a wide range of facies from fluvial, deltaic and ephemeral lake to marshes. The third tectono-sedimentary cycle comprises the Upper Pliocene sediments. In Slovakia these are represented by the Kolárovo Formation dated 4.1-2.6 Ma. The formation contains material of weathering crust preserved in fissures of Mesozoic carbonates, diluvial deposits and sediments of the alluvial environment.