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Academic literature on the topic 'Eocene sediments'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Eocene sediments"

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Fakhruddin, Rakhmat, and Dedy Kurniadi. "Age and Paleobathymetry of Salodik Group in PohPagimana section, East Arm of Sulawesi Based on Foraminiferal Assemblages." Journal of Geoscience, Engineering, Environment, and Technology 4, no. 1 (March 1, 2019): 30. http://dx.doi.org/10.25299/jgeet.2019.4.1.2751.

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Planktonic and benthic foraminiferal assemblages were used for age and paleobathymetry analysis of outcropping carbonate succession of the Salodik Group in Poh–Pagimana section, East Arm of Sulawesi. Twenty spot samples of carbonate rocks were collected from cut slope along the road between Poh and Pagimana. Age analysis conducted for each sample by its planktonic foraminifera assemblages and group into their age interval. The age range from Early Eocene to Pliocene. Benthic foraminiferal assemblages indicate paleobathymetry ranging from middle shelf to upper bathyal settings. Age analysis of the studied section show an older sediments (Early–Middle Eocene) overlie younger sediment (Early Miocene). This is interpreted as the evidence of thrust fault in the Poh–Pagimana section as part of thrust sheets of Batui thrust complex which imbricated on deformation zone. The youngest sediment which have suffered deformations shown by disordered age sequence is Pliocene in age (N20-21). The Eocene to Pliocene carbonate succession in the studied section was deposited relatively in the more basinward position compared to the carbonate-dominated sediments in the Tomori area which was deposited in the more landward position.
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Deyu, Zhang. "Clay mineralogy of the Upper Paleocene and Eocene clay sediments in Denmark." Bulletin of the Geological Society of Denmark 36 (December 31, 1987): 249–58. http://dx.doi.org/10.37570/bgsd-1988-36-06.

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The clay mineralogy of the Upper Paleocene and Eocene "plastic clay" sediments has been investigated from a new borehole in the Great Belt of Denmark. Predominant smectite, with small amounts of illite, kaolinite and, in the Holmehus Fm., chlorite, have been identified in the Upper Paleocene sediments. Abundant smectite and increased amounts of kaolinite and illite, with little chlorite, are present in the Eocene sediments. The Tertiary section of the borehole has been divided into two zones; one dominated by smectite with trace amount of kaolinite, including the Upper Paleocene and the Rl-R3 Beds of R!llsnres Clay Fm.; another characterized by the distinct increase of kaolinite and the relative decrease of smectite, including the R4-R6 and the Ll-lA Beds of Eocene sediments. Regionally, smectite content decreases, while kaolinite and illite increase from the north to the south and southeast in the Eocene sediments. No clear trend has been recognized in the Upper Paleocene sediments. The effect of material source, palaeoclimate and depositional environment on clay mineral distribution is discussed. The high content of smectite is considered to be mainly attributed to the alteration and/or weathering of volcanic material, contributions of smectitic clay from carbonate terrains and far trans­ported suspended matter from north-northwest. The change in climatic conditions may also be of importance. The distinct increase in kaolinite content of the Eocene sediments is thought to be related to a elastic source to the south and southeast and to the warmer climatic conditions.
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Hojati, S., H. Khademi, J. M. Arocena, A. Faz Cano, and S. Ayoubi. "Chronostratigraphic distribution and genesis of palygorskite in Tertiary sediments of the Isfahan region, central Iran." Clay Minerals 47, no. 1 (March 2012): 11–29. http://dx.doi.org/10.1180/claymin.2012.047.1.11.

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AbstractNo comprehensive study has yet been conducted to determine the chronostratigraphic distribution of palygorskite in the Tertiary sediments of Iran. Thirty sediment samples of different Tertiary epochs were taken, based on the field observations and geological maps. The clay fraction of samples was then investigated by X-ray diffraction (XRD), transmission and scanning electron microscopy (TEM and SEM), and inductively coupled plasma mass spectrometry (ICP-MS). Results showed that sediments of the Miocene and Pliocene had large amounts of palygorskite whereas no trace of this mineral was found in the sediments from the Palaeocene, Eocene and Oligocene. Geochemical analyses revealed that sediments younger than the Oligocene had greater amounts of soluble Mg and H4SiO4and a higher pH than those of the Palaeocene and Eocene. The stability diagram of the smectite-palygorskite system suggests that smectite is unstable and transforms to palygorskite in Neogene sediments. The SEM micrographs showed palygorskite as interwoven fibrous mats, coatings, pore-fillings and pore-bridging material in Neogene sediments. This textural evidence suggests a direct chemical precipitation of palygorskite by dissolution of silicates under the alkaline conditions. The results also suggest that geochemical conditions in the Early Tertiary era, represented by deep-sea conditions in central Iran, were not apparently favourable for palygoskite formation until the Late Oligocene.
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Kalender, Leyla, and Gamze Aytimur. "REE Geochemistry of Euphrates River, Turkey." Journal of Chemistry 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/1012021.

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The study area is located on the Euphrates River at 38°41°32.48′′N–38°14′24.10′′N latitude and 39°56′4.59′′E–39°8°13.41′′E longitude. The Euphrates is the longest river in Western Asia. The lithological units observed from the bottom to the top are Permo-Triassic Keban Metamorphites, Late Cretaceous Kömürhan Ophiolites, Upper Cretaceous Elazığ Magmatic Complex, Middle Eocene Maden Complex and Kırkgeçit Formation, Upper Pliocene and Lower Eocene Seske Formation and Upper Miocene, Pliocene Karabakır and Çaybağı Formations, Palu Formation, and Holocene Euphrates River sediments. The geochemical studies show that87Sr/86Sr and143Nd/144Nd isotopic compositions in the Euphrates River bank sediments are 0.7053, 0.7048, and 0.7057 and 0.512654, 0.512836, and 0.512775, respectively. These values indicate mixing of both carbonate-rich shallow marine sediment and felsic-mafic rocks from Elazığ Magmatic Complex into the stream sediments. The positiveεNd (0)values (0.35, 3.9, and 2.7) are higher downstream in the studied sediments due to weathering of the mafic volcanic rocks. The chondrite, NAS, and UCC normalized patterns show that the REE compositions of the Euphrates River sediments are higher than chondrite composition but close to NAS and UCC. The river sediments in the tectonic zone and the weathered granodioritic rocks of the Elazığ Magmatic complex affect upstream water compositions.
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Havryshkiv, Halyna, and Yuliya Haievska. "Facial features of the Paleocene-Eocene deposits of advanced units of the Skyba zone of Ukrainian Carpathians." Geology and Geochemistry of Combustible Minerals 3-4, no. 185-186 (2021): 44–55. http://dx.doi.org/10.15407/ggcm2021.03-04.044.

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There three main types of facies of Paleocene-Eocene complexes: sandy, siltstone and argillite distinguished within the study area by the nature of the distribution of the strata of the forming components were highlighted. Тhey accumulated avalanche at the foot of the continental slope and formed various facial parts of the foehn (Upper, Middle and Lower foehn). In the upper part of the Foehn was accumulated coarse-grained sediments (clusters of deep boulders and other psephyto-psammitic material containing edaphogenic rocks). Under the action of geostrophic and bottom currents, silt streams of pelitic and psammitic material moved in the direction to the south and south-east of the Carpathian sedimentation basin, forming sandy-clay and clay facies (Middle and Lower foehn). During the turbidite movement of a large amount of sediment from the first (shelf) to the second (foot of the continental slope) level of avalanche sedimentation, sorting and distribution of sediments on the continental slope took place. Based on the analysis of the material composition of Paleocene-Eocene sediments of the study area by such criteria as the size of the fragment, sedimentary textures and the ratio of different rocks, 7 facies were identified, which were deposited as gravitational flows down on the continental slope. Reconstructions of Paleocene-Eocene age flysch deposits showed that terrigene material in the studied sedimentation basin came from two sources – one of which was northwest of the study area and was characterized by a predominance of coarse-grained sandy sediments, while the source wear, which was in the central part of the studied basin was characterized by a predominance of clay silt and fine-grained psammitic material. This nature of the distribution of terrigenous material had a decisive influence on the further formation of Paleocene end Eocene sedimentary strata in the process of sedimentogenesis and post-sedimentary transformations of sediments, and on the formation of reservoir rocks and rocks with potential reservoir properties for hydrocarbon exploration. It has been established that the composition of the Psamitolites of the flysch formation of the Paleocene and Eocene ages of the Carpathians was formed on the passive continental margin or in the inland and boundary seas, and their genesis mostly corresponds only to the platform source of material wear.
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Tripathi, S. K. M. "Palynological changes across subsurface Palaeocene-Eocene sediments at Barmer, Rajasthan, India." Journal of Palaeosciences 46, no. (1-2) (December 31, 1997): 168–71. http://dx.doi.org/10.54991/jop.1997.1335.

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Palynofloras recovered from core samples from two bore-holes MK 327 and MK 332 drilled near Kapurdi, Barmer, Rajasthan are rich and diversified. Restricted occurrence of Matanomadhiasulcites maximus and Triangulorites pachyexinus alongwith other long-ranging taxa demarcates the Palaeocene sediments from those of Eocene. Presence of Eocene sediments in the studied bore-holes is indicated by the restricted occurrence of Meliapollis pachydermis, M. symplex, Lygodiumsporites lakiensis and Foveotricolporites reticuloidus. Two palynological zones, Assemblage Zone A indicating Late Palaeocene age and Assemblage Zone B indicating Early Eocene age, have been identified in the bore-hole sequences and sediments representing these zones have been correlated with Akli and Mataji Ka Dungar formations, respectively of the Barmer Basin.
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Strother, Stephanie L., Ulrich Salzmann, Francesca Sangiorgi, Peter K. Bijl, Jörg Pross, Carlota Escutia, Ariadna Salabarnada, Matthew J. Pound, Jochen Voss, and John Woodward. "A new quantitative approach to identify reworking in Eocene to Miocene pollen records from offshore Antarctica using red fluorescence and digital imaging." Biogeosciences 14, no. 8 (April 24, 2017): 2089–100. http://dx.doi.org/10.5194/bg-14-2089-2017.

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Abstract. Antarctic palaeoclimate evolution and vegetation history after the formation of a continent-scale cryosphere at the Eocene–Oligocene boundary, 33.9 million years ago, has remained a matter of controversy. In particular, the reconstruction of terrestrial climate and vegetation has been strongly hampered by uncertainties in unambiguously identifying non-reworked as opposed to reworked sporomorphs that have been transported into Antarctic marine sedimentary records by waxing and waning ice sheets. Whereas reworked sporomorph grains over longer non-successive geological timescales are easily identifiable within younger sporomorph assemblages (e.g. Permian sporomorphs in Pliocene sediments), distinguishing non-reworked from reworked material in palynological assemblages over successive geological time periods (e.g. Eocene sporomorphs in Oligocene sediments) has remained problematic. This study presents a new quantitative approach to identifying non-reworked pollen assemblages in marine sediment cores from circum-Antarctic waters. We measured the fluorescence colour signature, including red, green, and blue fluorescence; brightness; intensity; and saturation values of selected pollen and spore taxa from Eocene, Oligocene, and Miocene sediments from the Wilkes Land margin Site U1356 (East Antarctica) recovered during Integrated Ocean Drilling Program (IODP) Expedition 318. Our study identified statistically significant differences in red-fluorescence values of non-reworked sporomorph taxa against age. We conclude that red fluorescence is a reliable parameter for identifying the presence of non-reworked pollen and spores in Antarctic marine sediment records from the circum-Antarctic realm that are influenced by glaciation and extensive reworking. Our study provides a new tool to accurately reconstruct Cenozoic terrestrial climate change on Antarctica using fossil pollen and spores.
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Bijl, Peter K., G. Raquel Guerstein, Edgar A. Sanmiguel Jaimes, Appy Sluijs, Silvio Casadio, Victor Valencia, Cecilia R. Amenábar, and Alfonso Encinas. "Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow." Andean Geology 48, no. 2 (May 31, 2021): 185. http://dx.doi.org/10.5027/andgeov48n2-3339.

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The tectonic opening of the Tasmanian Gateway and Drake Passage represented crucial geographic requirements for the Cenozoic development of the Antarctic Circumpolar Current (ACC). Particularly the tectonic complexity of Drake Passage has hampered the exact dating of the opening and deepening phases, and the consequential onset of throughflow of the ACC. One of the obstacles is putting key regional tectonic events, recorded in southern Patagonian sediments, in absolute time. For that purpose, we have collected Campanian-Eocene sediment samples from the Chilean sector of Southern Patagonia. Using U-Pb radiometric dating on zircons and dinoflagellate cyst biostratigraphy, we updated age constraints for the sedimentary formations, and the hiatuses in between. Thick sedimentary packages of shallow-marine and continental sediments were deposited in the foreland basin during the early Campanian, mid-Paleocene, the Paleocene-Eocene boundary interval and the middle Eocene, which represent phases of increased foreland subsidence. We interpret regional sedimentary hiatuses spanning the late Campanian, early-to mid-Paleocene, mid-Eocene and latest Eocene-early Oligocene to indicate times of reduced foreland subsidence, relative to sediment supply. We relate these changes to varying subduction rates and Andean orogeny. Dinoflagellate cyst assemblages suggest that the region was under the influence of the Antarctic-derived waters through the western boundary current of the Subpolar Gyre, developed in the southwest Atlantic Ocean and thus argues for limited throughflow through the Drake Passage until at least the latest Eocene. However, the proliferation of dinoflagellate endemism we record in the southwest Atlantic is coeval with that in the southwest Pacific, and on a species level, dinoflagellate cyst assemblages are the same in these two regions. This suggests that both regions were oceanographically connected throughout the early Paleogene, likely through a shallow opening of a restricted Drake Passage. This implies a continuous surface-water connection between the south Pacific and the South Atlantic throughout the late Cretaceous-early Paleogene.
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Boulter, M. C. "Pollen and spore events from the marine Tertiary of North Europe." Journal of Micropalaeontology 5, no. 2 (December 1, 1986): 75–84. http://dx.doi.org/10.1144/jm.5.2.75.

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Abstract. Results are presented of semi-quantitative palynological analyses from two cored boreholes. One is from the central North Sea (16/1-1) and penetrates sediments from the Middle Miocene to the Palaeocene. The other is from the Voring Plateau of the Norwegian Sea (D.S.D.P. Leg 38 site 338) and penetrates sediments from the Early Miocene to the Early Eocene. The results show a number of interesting palynological features and these are discussed in relation to other evidence. The most important of these are: 1, the small range of angiosperm pollen in the Palaeocene; 2, changes in the dinocyst:pollen ratio in Early Eocene sediments in both cores at about the time of an increase in Subtriporopollenites pollen; 3, the presence of triprojectate pollen in the Late Eocene and Middle Oligocene sediments of site 338 some of which may not be reworked; and 4, a clear difference between Neogene and Palaeogene pollen taxa.
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Hill, Robert S., and Leonie J. Scriven. "Falcatifolium (Podocarpaceae) macrofossils from paleogene sediments in south-eastern Australia: a reassessment." Australian Systematic Botany 11, no. 6 (1998): 711. http://dx.doi.org/10.1071/sb97014.

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A re-investigation of macrofossils previously referred to the extantpodocarpaceous genus Falcatifolium Laubenfels shows thatno records can be sustained. Falcatifolium australisD.R.Greenwood from Middle Eocene sediments in Victoria bears littleresemblance to extant species in the genus and is transferred to the newfossil genus Sigmaphyllum R.S.Hill & L.J.Scriven.Specimens from Early Oligocene sediments in Tasmania previously assigned toFalcatifolium are described as a second species ofSigmaphyllum, S. tasmanensisR.S.Hill & L.J.Scriven, and specimens from mid to late Eocene sediments inTasmania previously assigned to Falcatifolium do notbelong to that genus, although their true generic affinities are uncertain.Dispersed cuticle specimens from Late Eocene–Oligocene sediments inSouth Australia referred to Falcatifolium are notreliable records of the genus and require further investigation. However,Dacrycarpus eocenica D.R.Greenwood, from Middle Eocenesediments in Victoria is transferred to Falcatifolium,and is similar to the extant species F. angustumLaubenfels, which has a leaf morphology unusual for the genus.Falcatifolium eocenica (D.R.Greenwood) R.S.Hill & L.J.Scriven is the only reliable record of the genus in the Australian fossilrecord to date.
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Dissertations / Theses on the topic "Eocene sediments"

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Hopcroft, Bradley Scott. "Lithology and provenance of late Eocene - Oligocene sediments in eastern Taranaki Basin margin and implications for paleogeography." The University of Waikato, 2009. http://hdl.handle.net/10289/2793.

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The latest Eocene and Oligocene was a time of marked paleoenvironmental change in Taranaki Basin, involving a transition from the accumulation of coal measures and inner shelf deposits to the development of upper bathyal environments. Up until the end of the Early Oligocene (Lower Whaingaroan Stage) Taranaki Basin had an extensional tectonic setting. Marine transgression culminated in the accumulation of condensed facies of the Matapo Sandstone Member of the lower part of the Ngatoro Group. During the Late Oligocene (Upper Whaingaroan Stage) Taranaki Basin's tectonic setting changed to one of crustal shortening with basement overthrusting westward into the basin on Taranaki Fault. The major part of the Ngatoro Group in thickness, including the Tariki Sandstone Member, Otaraoa Formation, Tikorangi Formation and Taimana Formation, accumulated in response to this change in tectonic setting. Various methods of stratigraphic and sedimentological characterisation have been undertaken to evaluate the stratigraphy of the Ngatoro Group. Wireline log records have been calibrated through particle sizing and carbonate digestion of well cuttings. A suite of wireline motifs have been defined for formations and members of the Ngatoro Group. The integration with other lithological and paleoenvironmental data sources has helped to better define the Late Eocene - Oligocene stratigraphy and sedimentary facies for eastern Taranaki Basin margin. U-Pb geochronology by laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) has been used to determine detrital ages for over 350 zircons from 13 samples of Late Eocene - Oligocene sandstone samples in eastern Taranaki Basin and correlative onshore North Island units. The spread of ages (1554 - 102 Ma) and the proportion of ages in particular age bands integrated with modal petrography data have aided provenance evaluation. A range of source rocks contributed to the Late Eocene - Oligocene sedimentary units analysed, mainly the Waipapa Terrane (Early Permian to Late Jurassic) as shown by 206Pb/238U zircon ages and the abundance of fine-grained sedimentary rock fragments observed in samples. The Median Batholith (i.e. Darran/Median Suite and Separation Point Suite) is also identified as a significant source, indicated by Early Triassic to Early Jurassic and Early Cretaceous 206Pb/238U zircon ages and an abundance of quartz in samples. Other minor sources identified include Murihiku and Caples Terranes, Rakaia Sub-terrane and possibly the Karamea Batholith. The Tariki Sandstone and the Hauturu Sandstone have the same source, with the main 206Pb/238U zircon ages of aggregated samples (124 - 116 Ma and 121 Ma, respectively) consistent with a Separation Point Suite/Median Batholith (124 - 116 Ma) source. Derivation of sediments from a landmass that existed to the east and southeast of the Wellington area has been inferred for the Late Eocene - Oligocene units, with subsequent migration of sediments northward into Taranaki Basin and the Waikato Region (i.e. Te Kuiti Group depocentre) via longshore drift. New provenance data have been used to revise understanding about the development of eastern Taranaki Basin margin through the Late Eocene to earliest Miocene. Three new paleogeography maps are presented for the Runangan (Late Eocene), Lower Whaingaroan (Early Oligocene) and Upper Whaingaroan (early-mid-Oligocene). New paleogeography interpretations illustrate a dramatic change in the basin development between Matapo Sandstone (Lower Whaingaroan) and Tariki Sandstone (Upper Whaingaroan) deposition, consistent with an Upper Whaingaroan age for the start of reverse movement on Taranaki Fault.
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Head, Martin James. "Dinoflagellate cysts and other marine palynomorphs from Lower Eocene through Lower Pliocene sediments of the Labrador Sea and Baffin Bay." Thesis, University of Aberdeen, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368502.

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Cenozoic sediments recovered during Leg 105 of the Ocean Drilling Program in Baffin Bay (Site 645) and the Labrador Sea (Sites 646 and 647) have yielded a persistent record of dinoflagellates and other marine palynomorphs. Hole 647A in the Labrador Sea contains an almost complete deep-water record of early Eocene through early late Oligocene sedimentation. Dinoflagellate assemblages indicate outer neritic to oceanic conditions throughout, but with possible increased influence from shelf environments during the early Eocene. Lower Eocene dinoflagellate assemblages are similar to coeval assemblages from the Rockall Plateau, but those from the middle through upper Eocene have mixed affinities, and are perhaps related to intensification of the proto-Gulf Stream. Oligocene dinoflagellate assemblages suggest the influence of both Arctic and North Atlantic watermasses at this site. A diverse marine palynoflora was recovered from upper Miocene and lowermost Pliocene sediments of Hole 646B in the central Labrador Sea. Palynomorph assemblages are thought to be largely allochthonous and may reflect changing bottom-water paleocurrents. The dinoflagellate flora consists of both oceanic and neritic species and indicates temperate surface-water conditions. Lower through lower upper Miocene dinoflagellates recovered from Baffin Bay (Hole 645E) indicate a cool-water, neritic environment. Assemblages have North Atlantic and Norwegian Sea affinities, but also contain notable protoperidiniacean elements. Dinoflagellate biostratigraphy estimates initiation of ice rafting in Baffin Bay at between 7.4 and 9.5 Ma. Increased terrigenous influx and apparent disappearance of certain dinoflagellate taxa occur in the middle to late Miocene and may be related to oceanographic changes or climatic deterioration. The erection of three new dinoflagellate genera, 19 new dinoflagellate species, and three new acritarch species, are among the many taxonomic proposals contained in this study of the Miocene. Several Miocene holotypes from Japan, have also been studied and compared to the Leg 105 material.
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Blaj, Teodora. "Late Eocene through Oligocene calcareous nannofossils from the paleo-equatorial Pacific Ocean – taxonomy, preservation history, biochronology and evolution." Doctoral thesis, Stockholm : Department of geology and geochemistry, Stockholm university, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-27600.

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Decou, Audrey [Verfasser], Hilmar von [Akademischer Betreuer] Eynatten, and Gerhard [Akademischer Betreuer] Wörner. "Provenance model of the Cenozoic siliciclastic sediments from the western Central Andes (16-21°S): implications for Eocene to Miocene evolution of the Andes / Audrey Decou. Gutachter: Hilmar von Eynatten ; Gerhard Wörner. Betreuer: Hilmar von Eynatten." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2011. http://d-nb.info/1042264899/34.

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Kahsnitz, Michaela [Verfasser], Helmut [Akademischer Betreuer] [Gutachter] Willems, and Jens [Gutachter] Lehmann. "Paleocene to Lower Eocene sediments of the eastern Neo-Tethyan Ocean : sedimentary and geodynamic evolution as well as biostratigraphy of the larger benthic foraminifera Lockhartia and the genesis of nodular limestones / Michaela Kahsnitz ; Gutachter: Helmut Willems, Jens Lehmann ; Betreuer: Helmut Willems." Bremen : Staats- und Universitätsbibliothek Bremen, 2017. http://d-nb.info/1142314227/34.

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Vinyoles, i. Busquets Andreu. "Sediment routing systems of the Eocene Tremp-Jaca basin: Stratigraphic analysis and numerical models." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/672479.

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The Eocene South-Pyrenean foreland basin provides a continuum of outcrops representing a Source to Sink sediment routing system from subaerial canyons to deep marine environments. On this context, the specific objective of this study is: (a) to contribute to the knowledge of the chronostratigraphy and the basin infill of the study area; (b) to analyze the evolution of the sedimentation rates on the Tremp-Jaca basin; and (c) to generate numerical models to (i) assess the sediment routing and sediment balance and, (ii) to evaluate the basin response to the propagation of climatic and tectonic signals. Two new magnetostratigraphic sections are built on the Tremp-Jaca basin; the Olsón (Ainsa basin) and the Yebra de Basa sections (Jaca basin). The Olsón section provides a late Lutetian to early Priabonian age for the Escanilla formation in the Ainsa basin, and the same age range is provided on the Yebra de Basa section for the strata encompassed between the Sabiñánigo sandstone and the Santa Orosia formation. The age constrains provided by these new sections and the data sorted from a systematic review of the literature have been used for an analysis of the sedimentation rates in the Tremp-Jaca basin. The studied sections were decompacted by backstripping to correct the differential burial compactions between the sections. This study shows that sedimentation rates may not show the expected variations related to depozone distribution. This lack of correlation between the depozones and the sedimentation rates are consequence of the lagged response to deformation front shifts and the complexity in the structure of the wedge-top. This complexity result in a widespread subsidence related to the emplacement of basement units in the hinterland. Also underfilled forelands may develop high sedimentation rates in the initial stages of wedge-top as basin gradients are a continuation to those developed in the previous foredeep phase. Sedimentation rates in overfilled areas are controlled by accommodation. In underfilled areas, the main control is clastic supply. During graded shelf regressive stages, maximum sedimentation rates are in foreset areas. In the transgressive stages, maximum sedimentation rates are at the topset. In out-of-grade periods, high sedimentation rates are in deep marine areas. The results obtained above have been used to feed forward stratigraphic models, using Dionisos software, to test and understand the different parameters affecting the sedimentary infill of the basin. A first model on the sediment routing systems of the Tremp-Jaca basin, based on the data from the sedimentation rates analysis, succeeds on reproducing the sedimentary routes that can be deduced from the paleocurrent patterns on the Tremp-Jaca basin, validating the inputted data. A second forward stratigraphic model, based on architectural and cyclostratigraphic analysis from previous works, determines that the high-frequency Milankovitch cyclicity of the Belsué-Atarés delta (Sierras Exteriores) is primarily forced from the sediment supply and secondary from the eustasy.
A les conques Eocenes Sudpirenaiques d’avantpaís hi ha un continu d’afloraments representatius de les rutes sedimentàries del sistema Source to Sink, des de canons subaeris fins a ambients marins profunds. En aquest context, aquest estudi té com a objectiu (a) contribuir al coneixement de la cronoestratigrafia i el reompliment de les conques de l'àrea d'estudi; (b) analitzar l’evolució de les taxes de sedimentació a la conca de Tremp-Jaca; i (c) generar models numèrics per (i) avaluar les rutes sedimentàries i el balanç sedimentari i (ii) avaluar la resposta de la conca a la propagació de senyals climàtics i tectònics. S’han construït dues noves seccions magnetostratigràfiques a la conca de Tremp-Jaca; les seccions d’Olsón (conca d’Aïnsa) i de Yebra de Basa (conca de Jaca). La secció d’Olsón proporciona una edat Luteciana superior fins a Priaboniana inferior per a la part superior de la formació Escanilla a la conca d’Aïnsa. A la secció de Yebra de Basa s’obté la mateixa franja d’edat pels estrats entre el gres de Sabiñánigo i la formació de Santa Orosia . Les edats proporcionades per aquestes noves seccions i les dades obtingudes a partir d'una revisió sistemàtica de les dades publicades, s'han utilitzat per a una anàlisi de les taxes de sedimentació de la conca de Tremp-Jaca. Les seccions estudiades han estat descompactades per backstripping per corregir l’enterrament diferencial que resulta en estadis de compactació diferents entre les seccions estudiades. Aquest estudi mostra que les taxes sedimentaries poden no mostrar les variacions esperades en relació a la distribució de les depozones. Aquesta manca de correlació entre les depozones i les taxes de sedimentació són conseqüència del retard en la resposta als canvis en la posició del front de deformació al wedge-top. Aquesta complexitat resulta en l’expansió de la subsidència relacionada amb l’emplaçament d’unitats basals al hinterland. Aquesta complexitat resulta en una major subsidència relacionada amb l’apilament d’unitats basalts al hinterland. També les conques d'avantpaís underfilled poden desenvolupar altes taxes de sedimentació en els estadis inicials del wedge-top, ja que els gradients sedimentaris són la continuació dels desenvolupats a la fase de foredeep anterior. Les taxes de sedimentació a les àrees overfilled estan controlades per l’acomodació. A les àrees underfilled, el control principal és l’aport de sediments. Durant els episodis regressius de les plataformes gradades, les taxes de sedimentació màximes es donen al topset. En els períodes no-gradats, les taxes de sedimentació més elevades es troben a les àrees marines profundes. Els resultats obtinguts s’han utilitzat per alimentar dos forward stratigraphic models, utilitzant el software Dionisos, per provar i entendre els diferents paràmetres que defineixen el reompliment de la conca. Un primer model en els sistemes de rutes sedimentàries de la conca de Tremp-Jaca, basat en les dades provinents de l’anàlisi de les taxes de sedimentació, té èxit en reproduir les rutes sedimentàries que es poden deduir dels paleocorrents de la conca de Tremp-Jaca, validant les dades introduïdes. Un segon model, a partir de dades arquitecturals i cicloestratigràfiques de treballs previs, determina que les ciclicitats de Milankovitch d’alta freqüència del delta de Belsué-Atarés (Sierras Exteriores) són primàriament forçats per l’aport sedimentari i secundàriament per l’eustàcia.
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Cantalejo, Lopez B. "Impact of basin tectonics and climate change on the timing of sediment flux to the Ainsa Basin, Middle Eocene, Spanish Pyrenees." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1457516/.

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This thesis integrates sedimentological, geochemical, magnetostratigraphic and spectral work from field and core data from the Middle Eocene, deep-marine siliciclastic sediments in the Ainsa Basin, Spanish Pyrenees. The deep-marine sediments of the Ainsa Basin comprise an alternation of coarse-grained sandbodies (submarine fans) and fine-grained packages of fan lateral-margin and interfan deposits. Time-series analysis performed on spectral gamma-ray and sandstone turbidite intensity data from 10 fine-grained interfan stratigraphic sections covering ~ 1.5 km of stratigraphy, and using multiple geochemical proxies (including high-resolution elemental XRF scanning, total organic carbon and carbon stable isotopes), all show that the interfan sediments contain a strong Milankovitch cyclicity. Orbital parameters most likely paced the cyclic delivery of the finer-grained sediments mainly by river- and delta-derived hyperpycnal turbidity currents. Sediment accumulation rates determined from spectral analysis reveal an overall decrease throughout the deep-marine stratigraphy from ~ 50 to ~13cm/kyr. Orbital tuning of the fine-grained sections using polarity reversals as anchor points permits the conversion from a depth-stratigraphy to a chronostratigraphy and also allows the estimation of the timing of initiation of each sandy submarine fan. The pacing of these sandbodies appears to have occurred at irregular time intervals and to have been of variable duration. They are, therefore, most likely controlled by the tectonic pulsating activity of the Pyrenean thrust systems linked with episodic changes in relative base level (e.g., overall tilting of the graded profile from source to sink, changing relative sea level).Climate may still have been important but only as a contributory rather than principal driver of submarine-fan development.
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Santos, Filho Rangel Borges dos. "Estratigrafia de sequencias no complexo vulcano-sedimentar de Abrolhos (Eoceno da Bacia do Espirito Santo, Brasil)." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/25545.

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No arquipélago de Abrolhos afloram rochas siliciclásticas nas ilhas de Santa Bárbara e Redonda. Datações radiométricas recentes atribuem a idade Eocênica às rochas vulcânicas aflorantes que ocorrem associadas a sequências sedimentares. Este trabalho sintetiza alguns aspectos sedimentológicos e estratigráficos levantados em campanhas de campo, com o objetivo de ampliar o conhecimento acerca de um dos poucos exemplares dessa natureza na margem continental leste do Brasil. Com base na classificação e interpretação das fácies, e no agrupamento destas em associações de fácies, foi possível inserir os depósitos estudados num contexto de plataforma rasa a profunda. Dessa forma, interpreta-se um modelo sedimentológico composto por um sistema deposicional deltaico e marinho raso, influenciado por ondas e caracterizado por um subsistema de shoreface médio a shoreface inferior. A partir do reconhecimento e da delimitação dos padrões de empilhamento das superfícies cronoestratigráficas nos perfis litológicos levantados nos afloramentos, foram identificadas três Sequências T-R de 4ª ordem. Os empilhamentos destas Sequências formam uma tendência geral progradacional para a seção estudada.
In the Abrolhos archipelago occours siliciclastic rocks outcrops on the islands of Santa Barbara and Redonda. Modern radiometric datings attribute Eocene age to the volcanic rocks occorrences associated with sedimentary sequences. This work summarizes some sedimentologics and stratigraphs aspects collected in field campaigns, in order to enhance our understanding about one of the few examples of its kind in the Brazilian continental eastern coast. Based on the classification and interpretation of facies, and the grouping of these facies associations, it was possible to insert the deposits studied in the context of shallow to deep shelf. Thus, it is interpreted sedimentological model composed of a deltaic depositional system and shallow marine, influenced by waves and characterized by a subsystem of medium shoreface to lower shoreface. From the recognition and demarcation of the stacking patterns of the surfaces chronostratigraphy in lithologic profiles collected in outcrops, three 4th order TR sequences were identified. The stacking of these sequences form a progradacional general trend for the section studied.
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Decou, Audrey. "Provenance model of the Cenozoic siliciclastic sediments from the western Central Andes (16-21°S): implications for Eocene to Miocene evolution of the Andes." Thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B303-A.

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Bullwinkel, Volker. "Organische Petrologie und Mikrofazies der mitteleozänen Seesedimente des Eckfelder Maares (Südwesteifel)." Doctoral thesis, 2003. http://hdl.handle.net/11858/00-1735-0000-0006-B30F-1.

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Books on the topic "Eocene sediments"

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Coccolith-bearing late middle Eocene kerogen shale, Tillamook Highlands, Northwest Oregon Coast Range. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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David, Bukry, Wells Ray E, and Geological Survey (U.S.), eds. Coccolith-bearing late middle Eocene kerogen shale, Tillamook Highlands, Northwest Oregon Coast Range. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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David, Bukry, Wells Ray E, and Geological Survey (U.S.), eds. Coccolith-bearing late middle Eocene kerogen shale, Tillamook Highlands, Northwest Oregon Coast Range. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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David, Bukry, Wells Ray E, and Geological Survey (U.S.), eds. Coccolith-bearing late middle Eocene kerogen shale, Tillamook Highlands, Northwest Oregon Coast Range. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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Coccolith-bearing late middle Eocene kerogen shale, Tillamook Highlands, Northwest Oregon Coast Range. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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David, Bukry, Wells Ray E, and Geological Survey (U.S.), eds. Coccolith-bearing late middle Eocene kerogen shale, Tillamook Highlands, Northwest Oregon Coast Range. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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Coccolith-bearing late middle Eocene kerogen shale, Tillamook Highlands, Northwest Oregon Coast Range. [Menlo Park, CA]: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin. Wiley-Blackwell, 2014.

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D, Henry Christopher, Ressel Michael W, and Geological Society of Nevada. Symposium, eds. Eocene magmatism and its role in generating sediment-hosted gold deposits of the Carlin Trend: Emigrant Pass volcanic field, northern Carlin Trend, Beast deposit, Genesis deposit, Betze-Post deposit, Tuscarora volcanic field, Mount Blitzen volcanic complex, Tuscarora epithermal precious-metal deposit. [Reno, Nev.?]: Geological Society of Nevada, 2000.

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Jovic, Sebastián Miguel. Geología y metalogénesis de las mineralizaciones polimetálicas del área El Tranquilo (Cerro León), sector central del Macizo del Deseado, provincia de Santa Cruz. Editorial de la Universidad Nacional de La Plata (EDULP), 2010. http://dx.doi.org/10.35537/10915/4346.

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La presente investigación tiene como eje principal el estudio detallado de las mineralizaciones y la geología de un área del Macizo del Deseado con características geológicas y metalogénicas únicas. La elección del área del El Tranquilo o también conocido como “anticlinal” El Tranquilo, como zona de estudio, se ha basado en el reducido conocimiento y la presencia características atípicas en las mineralizaciones y la escasa representación, en el Macizo del Deseado, de las rocas y unidades geológicas aflorantes. La investigación ha sido realizada en tres etapas: una primera con recopilación de antecedentes y trabajo de campo, una segunda analítica con trabajos de laboratorio y una tercera etapa interpretativa. Se realizó el procesado de imágenes satelitales (TM, SPOT, IKONOS) y se ejecutaron mapeos geológico-estructurales de detalle y semidetalle (con elaboración de una cartografía digital), descripción de testigos de sondeos (gran parte de los 30.000 metros de las perforaciones ejecutadas en la propiedad minera), se realizaron estudios petrográficos, calcográficos, de rayos X, determinaciones geoquímicas, estudios de inclusiones fluidas, de microscopía electrónica, microsonda electrónica, determinaciones geocronológicas y análisis de isótopos estables e inestables. Además se participó de otros trabajos complementarios realizados durante las distintas etapas de exploración minera, tales como geoquímica de suelos, muestras de trincheras y relevamientos magnetométricos y geoeléctricos terrestres y la interpretación, para la zona de trabajo, de estudios previos de magnetometría aérea y líneas sísmicas. El área del “anticlinal” El Tranquilo, está caracterizada por la presencia de rocas y unidades geológicas con escasa representación en el Macizo del Deseado, y representa una “ventana geológica” que permite el estudio del intervalo Triásico superior - Jurásico inferior, períodos que se encuentran poco expuestos en esta provincia geológica. La secuencia estratigráfica de este sector se inicia con las sedimentitas continentales, areniscas a areniscas conglomerádicas con intercalaciones de pelitas, del Grupo El Tranquilo, del Triásico medio a superior (Jalfin y Herbst 1995). Por encima, se presentan las rocas volcaniclásticas de la Formación Roca Blanca (Herbst, 1965), del Jurásico inferior. Esta es la litología más desarrollada en el área y está compuesta por tufitas, areniscas y sabulitas ricas en componentes volcánicos. Intruyendo a las sedimentitas continentales y a las tufitas, se disponen rocas básicas a intermedias del Jurásico inferior, que se presentan como filones capa de diabasa en el sector este del área y como pórfidos andesíticos de formas subcirculares en el sector noroeste, de la Formación Cerro León (Panza, 1995 y de Barrio et al., 1999). En los sectores norte y noreste del área afloran volcánitas del Jurásico medio a superior, basaltos y andesitas de la Formación Bajo Pobre, y en el sector sudoriental pequeños asomos de ignimbritas riolíticas del Grupo Bahía Laura (Panza, 1995). Estas unidades se encuentran parcialmente cubiertas por el Basalto Las Mercedes del Cretácico superior y el Basalto Cerro del Doce correspondiente al Eoceno (Panza, 1982) y finalizan esta secuencia sedimentos modernos, aluviales, coluviales y de bajos. En la presente investigación se determinó la presencia de niveles ignimbríticos ácidos y coladas basálticas intercaladas en las tufitas de la Formación Roca Blanca. A partir de las edades obtenidas, relaciones estratigráficas y composición se desvincula a los intrusivos dioríticos de la Formación Cerro León y se los asocia con el magmátismo de la Formación La Leona (Jurásico inferior). Los basaltos aflorantes en el área presentan características de basaltos continentales que se corresponden a los primeros indicios del magmatismo sinextensional jurásico y representan magmas básicos de origen mantélico que alcanzaron la superficie. Se los desvinculan de la Formación Bajo Pobre por ser ligeramente más antiguos al estar intercalados entre las tufitas de la Formación Roca Blanca (Jurásico inferior) y por presentar diferentes características isotópicas y petrogenéticas. Se define así una nueva unidad formacional para estas rocas denominándolas Formación El Piche. Los pórfidos andesíticos de la Formación Cerro León y las andesitas de la Formación Bajo Pobre presentan similitudes geoquímicas, isotópicas, petrogenéticas y edades semejantes, por lo que se interpreta un mismo origen para estas rocas, siendo los pórfidos andesíticos partes de los conductos de emisión de las coladas andesíticas. A diferencia del resto del Macizo del Deseado donde predomina casi por completo deformación con comportamiento netamente frágil, en el área de estudio se reconoció deformación tanto dúctil como frágil en las secuencias triásicas y jurásicas. Los rasgos estructurales más sobresalientes son: un domamiento regional de entre 15 a 20 km de diámetro, definido por Di Persia (1956) como “anticlinal” El Tranquilo, domamientos y plegamientos con dimensiones menores a 1 km localizados dentro de la antiforma regional, un sistema de fracturas radiales asociado al domamiento y la falla El Tranquilo con un sistema de vetas controladas por fallas. Se determinó que el “anticlinal” El Tranquilo, se formó por el emplazamiento de un cuerpo intrusivo no aflorante del orden de 8 a 10 Km de diámetro y profundidad mínima hasta su techo de 1400 m, subyaciendo al Grupo El Tranquilo y a la Formación Roca Blanca, y generando por su intrusión, el domamiento regional y los domamientos y plegamientos con dimensiones menores a 1 km localizados corresponde a una deformación producida por lacolitos o stocks no aflorantes. En el área de estudio se reconocieron gran cantidad de mineralizaciones, las que totalizan ~80 km lineales de vetas, ubicadas principalmente en el sector central del área. Las vetas se concentran hacia el este de la estructura regional, la falla El Tranquilo, son subparalelas a esta estructura y están emplazadas en las tufitas de la Formación Roca Blanca y pelitas y areniscas del Grupo El Tranquilo. Se han discriminado dos tipos distintos de vetas según su composición y expresión superficial, vetas formadas por importantes zonas de oxidación que representan la expresión superficial de vetas de sulfuros, y vetas, brechas hidrotermales, vetillas y stockworks formados principalmente por cuarzo. A partir de las distintas características observadas y datos obtenidos (composición, signatura geoquímica, mineralogía, datos de inclusiones fluidas, isótopos, controles estructurales y litológicos y edades) se ha podido diferenciar dos estilos de mineralización. La mineralización polimetálica que presenta una compleja mineralogía de sulfuros asociada a una signatura geoquímica de In, Cu, Au, As, Sn, W, Bi, Zn, Pb, Ag, Cd y Sb. Las temperaturas y salinidades de los fluidos indican un sistema epitermal para la formación de estas vetas. Su génesis esta vinculada a los cuerpos intrusivos dioríticos reducidos por sedimentos ricos en materia orgánica, concentrando en los fluidos hidrotermales In, Sn, Ag, W, Bi. Se define a esta mineralización como un depósito epitermal vetiforme polimetálico rico en In semejante a los depósitos de Japón y Bolivia. Las características de esta mineralización y la edad Jurásica inferior (193 Ma) confirman la presencia de un nuevo tipo de deposito epitermal que difiere del clásico modelo de baja sulfuración del Macizo del Deseado y que no se encuentra asociado al importante volcanismo bimodal del Jurásico medio a superior (Complejo Bahía Laura), como la mayoría de las mineralizaciones del Macizo del Deseado. Este hecho potencia el hallazgo de otros tipos de depósitos epitermales polimetálicos, asociados a otras rocas y con diferentes asociaciones metalogénicas. La mineralización argentífera está formada por cuarzo, carbonatos y en menor medida sulfuros y sulfosales con una signatura geoquímica de Ag (Au), Pb, Cu y Zn. Las temperaturas y salinidades de los fluidos indican un sistema epitermal para la formación de estas vetas. Su génesis está vinculada al magmatismo intermedio de las Formaciones Cerro León y Bajo Pobre, atribuyéndole una edad Jurásica media (168 Ma). Según sus características esta mineralización puede ser definida como un depósito epitermal de sulfuración intermedia. Esta mineralización también representa una variación en el modelo de baja sulfuración del Macizo del Deseado, pero está genéticamente asociada al volcanismo bimodal del Complejo Bahía Laura (Fm. Bajo Pobre) por lo que podría incluirse dentro de las mineralizaciones de la Provincia auroargéntifera del Deseado.
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Book chapters on the topic "Eocene sediments"

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AlRefaei, Yaqoub, Ali Najem, Aimen Amer, and Faisal Al-Qattan. "Surface Geology of Kuwait." In The Geology of Kuwait, 1–26. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-16727-0_1.

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AbstractThis chapter represents a comprehensive review of Kuwait’s surface geology and stratigraphy from previous works accomplished by numerous geoscience researchers in the past decades. The surface of Kuwait is characterized by nearly flat topography, featureless to gently undulating, apart from a few tens of meters of escarpments in the north and south, and flat low to moderately elevated hills and ridges. It predominantly consists of siliciclastic sediments and sedimentary rock units ranging in age from Middle Eocene to Holocene. The main stratigraphic exposed successions are located in Jal Az-Zor escarpment, Al-Subyiah (Bahrah) area, Ahmadi Quarry, the Khiran Ridges, and the Enjefa Beach. The oldest exposed rock units are represented by the Middle Eocene Dammam Formation, which is exposed at the Ahmadi Quarry, whereas the youngest recent deposits cover most of Kuwait’s surficial area and lie on top of the Kuwait Group’s deposits. This chapter will illustrate the geology and stratigraphy of Kuwait's surface sediments and sedimentary rock strata. Recommendations and future insights were also documented as part of the way forward to improve the presently available work for the surface geology of Kuwait.
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ParéS, Josep M., and Luca Lanci. "A Middle Eocene-Early Miocene Magnetic Polarity Stratigraphy in Equatorial Pacific Sediments (Odp Site 1220)." In Timescales Of The Paleomagnetic Field, 131–40. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/145gm10.

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Röhl, Ursula, Henk Brinkhuis, Catherine E. Stickley, Mike Fuller, Stephen A. Schellenberg, Gerold Wefer, and Graham L. Williams. "Sea level and astronomically induced environmental changes in Middle and Late Eocene sediments from the East Tasman Plateau." In The Cenozoic Southern Ocean: Tectonics, Sedimentation, and Climate Change Between Australia and Antarctica, 127–51. Washington, D. C.: American Geophysical Union, 2004. http://dx.doi.org/10.1029/151gm09.

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Lenz, Olaf K., Volker Wilde, and Walter Riegel. "Palynology as a High-Resolution Tool for Cyclostratigraphy in Middle Eocene Lacustrine Sediments: The Outstanding Record of Messel (Germany)." In Springer Geology, 113–17. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_23.

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Olivarez Lyle, A., and M. Lyle. "Organic Carbon and Barium in Eocene Sediments: Possible Controls on Nutrient Recycling in the Eocene Equatorial Pacific Ocean." In Proceedings of the Ocean Drilling Program, 199 Scientific Results. Ocean Drilling Program, 2005. http://dx.doi.org/10.2973/odp.proc.sr.199.222.2005.

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Kennett, D. M., and J. P. Kennett. "Bolboforma Daniels and Spiegler|from Eocene and Lower Oligocene Sediments|Maud Rise|Antarctica." In Proceedings of the Ocean Drilling Program, 113 Scientific Reports. Ocean Drilling Program, 1990. http://dx.doi.org/10.2973/odp.proc.sr.113.208.1990.

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Faul, K. L., and A. Paytan. "Phosphorus and Barite Concentrations and Geochemistry in Site 1221 Paleocene/Eocene Boundary Sediments." In Proceedings of the Ocean Drilling Program, 199 Scientific Results. Ocean Drilling Program, 2005. http://dx.doi.org/10.2973/odp.proc.sr.199.214.2005.

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Taft, George, and Bilal Haq. "Deep Sea Fan Issues." In Continental Shelf Limits. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195117820.003.0026.

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Deep sea fans occur along many continental margins. The Bengal Fan is the world's largest elongated submarine fan area, occupying over 3 x 106 km2 of seafloor in the Bay of Bengal. The Bay of Bengal is bordered by Sri Lanka, India, Bangladesh, Myanamar, the Andaman and Nicobar Islands, and Sumatra. The fan spans an area that is 2800-3000km in length and 830-1430 km in width. At the northern end of the Bay, the sediment cover is estimated to be more than 16 km in thickness (Curray and Moore, 1971, 1974, Moore et al., 1974). Recent drilling on the distal part of the fan just south of the equator during Ocean Drilling Program Leg 116 cored nearly 1 km of sediment without reaching hardrock basement (Cochran et al., 1990). The submarine feature of the Ninetyeast Ridge divides the fan into two major lobes, the main Bengal Fan and the eastern lobe, also known as the Nicobar Fan (Curray and Moore, 1974) (figure 19.1). The fan extends from 20°N latitude and, based on recent sedimentological and channel-system studies, to beyond 9°S latitude (Stow et al., 1990; Hübscher et al., 1997). The great size of the Bengal Fan is related to the history of the collision of the Indian tectonic plate with Eurasia and the subsequent uplift of the Himalayas. The first encounter of the northward-moving Indian Plate with the Asian mainland occurred around 50 million years (my) ago in the early Eocene Epoch (Haq, 1985). The first collision caused the initial uplift in the Himalayan region. Sedimentation in the bay is inferred to have started after this first collision, but extensive sedimentation probably did not begin until the early Miocene (ca. 17 my ago) after a major uplift in the Himalayas (Haq, 1985). Weathering and denudation of the Himalayas has furnished huge volumes of sediments that have built the Bengal Fan, supplied through the Ganges and Brahmaputra Rivers and their delta (figure 19.2). Sediments are transported largely by turbidity currents across the submerged continental terrace in the proximal part of the fan through a major delta-front canyon, also known as the Swatch-of-No-Ground. Currently, this canyon discharges its load into a single active channel that supplies sediment to the entire length of the fan.
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Polgreen, E. L., and W. W. Sager. "Data Report: Paleomagnetic Measurements of Paleocene-Eocene Sediments, Leg 143, Holes 865B and 865C." In Proceedings of the Ocean Drilling Program, 143 Scientific Results. Ocean Drilling Program, 1995. http://dx.doi.org/10.2973/odp.proc.sr.143.234.1995.

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Knox, R. W. O'B. "Stratigraphic Significance of Volcanic Ash in Paleocene and Eocene Sediments at Sites 549 and 550." In Initial Reports of the Deep Sea Drilling Project, 80. U.S. Government Printing Office, 1985. http://dx.doi.org/10.2973/dsdp.proc.80.134.1985.

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Conference papers on the topic "Eocene sediments"

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Radwan, A., A. Kassem, A. Atef, A. Uchman, and R. Jach. "Contribution to the Eocene Sediments in Egypt: A New Formation Name for the Earlymiddle Eocene Sediment." In 82nd EAGE Annual Conference & Exhibition. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202011446.

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Akhundov, Shahin Khosrov, Mushfig Farhad Tagiyev, Arastun Ismail Khuduzade, and Natig Namig Aliyev. "Hydrocarbon Generative Properties and Maturity of Cretaceous and Eocene Sediments in the Middle Kura Depression, Azerbaijan." In SPE Annual Caspian Technical Conference. SPE, 2021. http://dx.doi.org/10.2118/207041-ms.

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Abstract Meso-Cenozoic sedimentary cover in the Middle Kura depression located between the Greater and Lesser Caucasus mountain structures contains numerous oil accumulations. According to studies in the Cretaceous and Paleogene strata, sedimentary organic matter is of mixed clastic-marine origin. Moderate amounts of organic matter have been recorded in the Eocene sediments (on average 0.70%), in the Upper and Lower Cretaceous average values made up 0.39% и 0.42%, respectively. Analysis of bitumoid composition suggests that in a number of areas bitumoids have experienced a widespread movement across the sedimentary strata. The results of measurements on isolated samples indicate that the Cretaceous strata have only advanced to the initial hard-coal stage of organic transformation (0.48-0.55%Ro). On vitrinite reflectance data the Eocene deposits in studied areas of the Middle Kura depression have reached initial (brown-coal) stage of catagenetic transformation (±0.48Ro%; est. paleotemperature of 85°C). Nonetheless, analysis of formation conditions of commercial HC accumulations found earlier in the Eocene strata allows considering them the most prospective in the Middle Kura depression.
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Akhundov, Shahin Khosrov, Mushfig Farhad Tagiyev, Arastun Ismail Khuduzade, and Natig Namig Aliyev. "Hydrocarbon Generative Properties and Maturity of Cretaceous and Eocene Sediments in the Middle Kura Depression, Azerbaijan." In SPE Annual Caspian Technical Conference. SPE, 2021. http://dx.doi.org/10.2118/207041-ms.

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Abstract Meso-Cenozoic sedimentary cover in the Middle Kura depression located between the Greater and Lesser Caucasus mountain structures contains numerous oil accumulations. According to studies in the Cretaceous and Paleogene strata, sedimentary organic matter is of mixed clastic-marine origin. Moderate amounts of organic matter have been recorded in the Eocene sediments (on average 0.70%), in the Upper and Lower Cretaceous average values made up 0.39% и 0.42%, respectively. Analysis of bitumoid composition suggests that in a number of areas bitumoids have experienced a widespread movement across the sedimentary strata. The results of measurements on isolated samples indicate that the Cretaceous strata have only advanced to the initial hard-coal stage of organic transformation (0.48-0.55%Ro). On vitrinite reflectance data the Eocene deposits in studied areas of the Middle Kura depression have reached initial (brown-coal) stage of catagenetic transformation (±0.48Ro%; est. paleotemperature of 85°C). Nonetheless, analysis of formation conditions of commercial HC accumulations found earlier in the Eocene strata allows considering them the most prospective in the Middle Kura depression.
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Kuzmina, Olga B., and Natalia K. Lebedeva. "Palynological characteristic of the border cretaceous and paleogene deposits in the Sourth of Trans-Ural region (bh 9, Troizk)." In Недропользование. Горное дело. Направления и технологии поиска, разведки и разработки месторождений полезных ископаемых. Экономика. Геоэкология. Федеральное государственное бюджетное учреждение науки Институт нефтегазовой геологии и геофизики им. А.А. Трофимука Сибирского отделения Российской академии наук, 2020. http://dx.doi.org/10.18303/b978-5-4262-0102-6-2020-014.

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The Upper Cretaceous and Paleogene sediments exposed in Borehole 9 (Troizk, Chelyabinsk Area) in the south of the Trans-Ural Region (Western Siberia) are studied by palynological methods. The BH9 has uncovered the Fadyushinskaya and Gan’kino formations of Upper Cretacious age and the Talitsa, Serov, Irbit, Chegan and Kurtamysh formations of Paleogene age. Nine dinocysts assemblages and nine spores and pollen assemblages were revealed. The Campanian, Maastrichtian, Late Paleocene, Low-Middle Eocene and Early Oligocene age of the sediments were substantiated.
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Guimbi Nzoumba, Ghervy N., and Thomas Yancey. "DOCUMENTING DIATOM OCCURENCE IN LATE EOCENE MARINE COASTAL SEDIMENTS IN CENTRAL TEXAS." In 51st Annual GSA South-Central Section Meeting - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017sc-289554.

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Stemmerik, L., and T. Varming. "Seismic Multi-attribute Analysis of Palaeocene-Eocene Deep-water Sediments Offshore Southern West Greenland." In 79th EAGE Conference and Exhibition 2017. Netherlands: EAGE Publications BV, 2017. http://dx.doi.org/10.3997/2214-4609.201700635.

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Stojanova, Violeta. "BIOSTRATIGRAPHIC CHARACTERISTICS OF UPPER - EOCENE SEDIMENTS IN THE SERBIAN-MACEDONIAN MASSIF, REPUBLIC OF MACEDONIA." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/11/s01.007.

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Niyolia, D., S. Kumar, and S. Dutta. "Biomarker Signatures Revealed by Gcxgc-Tofms in Eocene Sediments from Cambay Basin, Western India." In 29th International Meeting on Organic Geochemistry. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201902981.

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Rubino, Erica, Andrew Leier, S. Bruce Archibald, and Elizabeth J. Cassel. "DETRITAL ZIRCON HF CHARACTERIZATION OF EOCENE SEDIMENTS DEPOSITED IN THE SOUTHERN CANADIAN CORDILLERAN HINTERLAND." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-302749.

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White, Emily J., Elizabeth J. Cassel, Owen A. Anfinson, and Christopher D. Henry. "HEAVY MINERAL ANALYSIS OF EOCENE SEDIMENTS DEPOSITED ON THE HIGH ELEVATION NORTH AMERICAN CORDILLERAN PLATEAU." In 68th Annual Rocky Mountain GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016rm-276242.

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Reports on the topic "Eocene sediments"

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Barker, J. C. Evidence for geothermal tungsten & germanium mineralization in Eocene coal and associated sediments, Fort Hamlin Hills, area, interior, Alaska. Alaska Division of Geological & Geophysical Surveys, 2006. http://dx.doi.org/10.14509/14862.

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Dafoe, L. T., G. L. Williams, K. Dickie, U. Gregersen, P. C. Knutz, G. Dam, G. K. Pedersen, H. Nøhr-Hansen, J. W. Haggart, and K. J. DesRoches. Overview of the stratigraphy, paleoclimate, and paleoceanography of the Labrador-Baffin Seaway. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/321853.

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The tectonic evolution of the Labrador-Baffin Seaway began with Early Cretaceous extension between Greenland and North America, resulting in the development of basins infilled with nonmarine and shallow-marine clastic strata. The Late Cretaceous was a time of continued rifting and local subsidence, with deposition of widespread deeper water marine mud and localized sand deposits. Seafloor spreading began in the south in the Latest Cretaceous and propagated throughout the seaway by the Early Paleocene. Regional seafloor spreading coincided with the onset of significant volcanism in the Davis Strait to central West Greenland region, as well as a regional regression. A change in the spreading direction around the Paleocene- Eocene boundary, was accompanied by strike-slip motion in the Davis Strait and Baffin Bay, deformation and basin inversion, and development of regional unconformities. After seafloor spreading ceased in the late Eocene, the seaway was filled by upper Paleogene to Recent sediments, with clinoform progradation building the modern-day shelves.
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