Готові списки джерел за темами / Paleodelta

Добірка наукової літератури з теми "Paleodelta"

Автор: Grafiati

Опубліковано: 4 травня 2024

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Статті в журналах з теми "Paleodelta"

Dai, Chen, Shu Gao, Yongzhan Zhang, Fei Xia, and Dandan Wang. "A Paleo-Changjiang Delta Complex on the East China Sea Shelf Formed Some 30 ka Ago (at the MIS 3 Stage)." Journal of Marine Science and Engineering 11, no. 11 (October 24, 2023): 2035. http://dx.doi.org/10.3390/jmse11112035.

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The distribution patterns of the paleo-Changjiang River deltas formed during the MIS 3 period before the last glacial maximum (LGM) contain important information about the deltaic deposits in response to climate and sea-level changes. However, so far, they are still poorly understood. Here, we reconstruct the stratigraphic and chronological framework of the deltaic system based on the analysis of 1835 km of high-resolution seismic profiles obtained from the northern East China Sea, together with a comparison with the research results from four existing boreholes and three groups of published seismic profiles from the study area. Within the strata from MIS 5 to MIS 1 that are preserved on the northern shelf of the East China Sea, we discovered a large-scale paleodeltaic complex formed during the MIS 3 period. During MIS 3, sea level dropped slowly; the paleodelta formed was large in scale and was distributed between water depths of 40 and 150 m. It is now directly exposed at the seabed at a depth of more than 100 m. The paleodelta had extended from the northwest to the southeast, with maximum thickness of the deposits around 55 m. The extensions in the east–west and south–north directions both exceeded 300 km, with a total area around 1.35 × 105 km2. Since the late Pleistocene, the tectonic structure beneath the East China Sea has been relatively stable. As such, sea-level fluctuations, sediment supply, and original topography were the main controlling factors for the development of the delta.

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Narayana, A. C., Vinu Prakash, P. K. Gautam, and Swati Tripathi. "Holocene environmental changes as recorded in sediments of a paleodelta, southwest coast of India." Quaternary International 443 (July 2017): 115–23. http://dx.doi.org/10.1016/j.quaint.2017.04.016.

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Il'ina, N., and V. Zharkov. "Palynological assemblage of the Synya Formation (Middle Triassic) from outcrops at the Vertny river (Bol’shaya Synya Depression, the Timan-Northern Urals region)." Vestnik of geosciences, no. 3 (June 8, 2023): 23–41. http://dx.doi.org/10.19110/geov.2023.3.3.

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The results of a palynological study of terrigenous rocks exposed in the lower reaches of the Vertny River and correlated with the Syninskaya Formation of the Bolshesyninskaya Series of the Legend of the North Ural Sheet Series GK-200/2 are presented. The Middle Triassic (Ladinian) age of the rocks was determined. A quantitative analysis of the species composition of the identified palynological assemblage using the Sporomorph EcoGroup method (SEG-analysis) was carried out. Based on palynological data, elements of the vegetation cover and landscape conditions have been reconstructed. It is concluded that the studied deposits were formed in the Ladinian Age in a very warm, humid climate within a vast tidal paleodelta. In the formation of the terrestrial vegetation cover, the leading role was played by moisture-loving plants characteristic of coastal marshes, deltaic lowlands, and tidal flats with mangrove-like thickets.

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Vasilev, Atanas, Petar Petsinski, Raina Hristova, and Rosica Pehlivanova. "Heat flow over a gas hydrate deposit in the Danube paleodelta: cruise MN249, 10-20/09/2023." Review of the Bulgarian Geological Society 84, no. 3 (December 2023): 223–26. http://dx.doi.org/10.52215/rev.bgs.2023.84.3.223.

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This work presents results from the first purposeful in situ temperature measurements in seafloor sediments above a scalable gas hydrate deposit in the deep-water Danube paleodelta. Temperatures and temperature gradients with accuracy 5 mK and sensitivity 1 mK are measured with 3 MTL loggers with clamps (Antares GmbH) welded to a gravity corer with length of 6 m, outer diameter of 130 mm and weight ~300 kg. During the cruise MN249 on board of the Romanian R/V Mare Nigrum 10-20/10/2023, the gravity corer was deployed on 23 stations with successful temperature measurements and >3 m sediments lifting on 11 stations. Temperature gradients above the gas hydrate deposit (BSR area) are in ~20–50 mK/m when the background is ~30 mK/m. Additional data needed to determine the effects from the 2 main factors formatting temperature gradients – gas hydrate masses and sedimentation rates.

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Adams, Peter N. "Geomorphic origin of Merritt Island-Cape Canaveral, Florida, USA: A paleodelta of the reversed St. Johns River?" Geomorphology 306 (April 2018): 102–7. http://dx.doi.org/10.1016/j.geomorph.2018.01.005.

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Naudts, Lieven, Marc De Batist, Jens Greinert, and Yuriy Artemov. "Geo- and hydro-acoustic manifestations of shallow gas and gas seeps in the Dnepr paleodelta, northwestern Black Sea." Leading Edge 28, no. 9 (September 2009): 1030–40. http://dx.doi.org/10.1190/1.3236372.

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Martin, John, Anjali M. Fernandes, Jennifer Pickering, Nick Howes, Simon Mann, and Katja McNeil. "The Stratigraphically Preserved Signature of Persistent Backwater Dynamics in a Large Paleodelta System: The Mungaroo Formation, North West Shelf, Australia." Journal of Sedimentary Research 88, no. 7 (July 31, 2018): 850–72. http://dx.doi.org/10.2110/jsr.2018.38.

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Lobacheva, D. M., E. N. Badyukova, and R. R. Makshaev. "The Positions of the Channels of the Volga Paleodelta at the End of the Khvalynian Time According to Geomorphological Data." Arid Ecosystems 13, no. 3 (August 12, 2023): 248–56. http://dx.doi.org/10.1134/s2079096123030071.

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Trobec, Ana, Martina Busetti, Fabrizio Zgur, Luca Baradello, Alberto Babich, Andrea Cova, Emiliano Gordini, et al. "Thickness of marine Holocene sediment in the Gulf of Trieste (northern Adriatic Sea)." Earth System Science Data 10, no. 2 (June 14, 2018): 1077–92. http://dx.doi.org/10.5194/essd-10-1077-2018.

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Abstract. We use various geophysical datasets (multibeam and singlebeam echosounder data, sub-bottom profiling Chirp and sonar data and very high-resolution boomer seismic data) along with published sedimentological data and depth data from nautical charts in order to create models of the depth of the seafloor and the base of Holocene marine sediment in the Gulf of Trieste. The two models are later used in order to calculate the thickness of marine Holocene sediment which has been depositing on the Late Pleistocene alluvial plain since the Holocene transgression in the Italian and Slovenian parts of the gulf. Thicker Holocene marine sedimentary sequences averaging at around 5 m are characteristic for the southeastern part of the gulf. In other parts of the gulf the Holocene marine sedimentary cover is very thin or even absent, except in close proximity to the shoreline and fluvial sediment sources, in the area of the Trezza Grande paleodelta and above topographic depressions of the Late Pleistocene base. The presented datasets available from the OGS SNAP data repository (http://doi.org/cpz2) represent a valuable reference for a wide variety of research disciplines dealing with the dynamic Earth system in the Gulf of Trieste and could be used as a valuable tool for designing sampling and geophysical campaigns in the studied area.

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Miluch, Jakub, Łukasz Maciąg, Andrzej Osadczuk, Jan Harff, Tao Jiang, Hongjun Chen, Ryszard Krzysztof Borówka, and Kevin McCartney. "Multivariate geostatistical modeling of seismic data: Case study of the Late Pleistocene paleodelta architecture (SW off-shore Hainan Island, south China sea)." Marine and Petroleum Geology 136 (February 2022): 105467. http://dx.doi.org/10.1016/j.marpetgeo.2021.105467.

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Більше джерел

Дисертації з теми "Paleodelta"

Sabil, Naïma. "La datation par les traces de fission : aspects méthodologiques et applications thermochronologiques en contexte alpin et marge continentale." Phd thesis, Grenoble 1, 1995. http://www.theses.fr/1995GRE10066.

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La méthode de datation par les traces de fission de l'uranium s'est révélée unique dans le domaine de la thermochronologie par sa capacité à retracer l'histoire finale du refroidissement et de la dénudation de massifs métamorphiques comme de l'histoire thermique de formations sédimentaires ou la datation de certains matériels volcaniques. Dans ce travail, nous décrivons cette méthode et présentons un ensemble de techniques analytiques mises au point et de calibrations réalisées dans le but d'utilisations ultérieures en géologie. Nous discutons quelques exemples d'application. Dans les Alpes occidentales françaises, l'analyse des traces de fission sur apatites d'échantillons issus du granite des Sept Laux (massif de Belledonne), dans la vallée de l'Eau d'Olle, suggère que cette méthode pourrait apporter une contribution dans la discussion actuelle sur l'origine de certaines vallées alpines. Ainsi, l'ouverture de cette vallée pourrait être la conséquence d'un jeu de failles actives depuis le Miocène moyen jusqu'à l'actuel. La caractérisation par traces de fission des apatites détritiques de dépôts fluviaux pourrait éventuellement être utilisée pour l'étude d'éventuels phénomènes de captures liées à des changements de régimes tectoniques. Nous avons ainsi étudié les apatites d'un paléodelta situé dans la moyenne vallée de l'Isère au niveau du sillon subalpin, et de deux vallées, celles de l'Arc et du Bréda, situées en amont. La distribution des âges traces de fission de ces minéraux n'a pas confirmé un modèle suggéré récemment, qui proposait que le paléodelta étudié pourrait être associé à un «paléo-Arc» plutôt qu'à un «paléo-Bréda». Dans la Meseta occidentale marocaine, trois massifs granitiques (massif de Sebt Brikiine, de Ras El Abiod et de Hjir El Bark) situés dans les Rehamna ont fait l'objet d'une étude thermochronologique. L'analyse des traces de fission dans les zircons et les apatites de ces granites montre qu'ils ont enregistré les grands évènements thermotectoniques ayant affecté la Meseta depuis l'ouverture de l'Océan Atlantique central. Nous montrons comment un modèle de simulation numérique récemment proposé (1994) pour l'analyse des traces de fission dans les apatites permet de préciser l'histoire thermique des massifs considérés depuis le dernier refroidissement au-dessous d'environ 120°C des échantillons analysés. Dans des travaux effectués antérieurement à l'apparition de ce modèle, nous avons montré, d'une part, que les sédiments de la marge transformante de Côte d'Ivoire-Ghana avaient connu une période de réchauffement entre 250°C et moins de 60°C post-datant largement, de manière inattendue, le «balayage» d'une dorsale océanique. D'autre part, dans l'Ile d'Elbe, nous avons apporté les premières données «traces de fission» sur l'histoire de refroidissement de la granodiorite de Monte Capanne. Par ailleurs, au début des années 90, la méthode des traces de fission manquait encore de bons échantillons de référence pour la datation des verres volcaniques. A la suggestion de la Sous-Commission de Géochronologie de l'International Union of Geological Sciences, nous avons étudié les macusanites, obsidiennes du SE péruvien. Les résultats de ce travail suggèrent qu'il faut considérer avec réserve ces verres volcaniques en tant que standards d'âge potentiels, même s'ils conservent une certaine valeur comme matériel d'intercalibration entre laboratoires

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Книги з теми "Paleodelta"

Girininkas, Algirdas, and Vladas Žulkus, eds. Lithuanian Baltic Sea Coasts during the Holocene: Sea Level Changes, Environmental Developments and Human Adaptations. BAR Publishing, 2022. http://dx.doi.org/10.30861/9781407359878.

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Lithuanian Baltic Sea Coasts During the Holocenefocuses on the relicts of the cultural and natural landscapes that survived in the Baltic Sea during the final Paleolithic-Middle Neolithic period in Lithuania. Using a combination of interdisciplinary research methodologies from archaeology, physical and biomedical sciences, with innovative use of underwater technologies, the contributors identify complex underwater landscapes (relic forests, peat bogs, lagoons, paleodelts or palaeo-riverbeds) and cultural objects to determine the evolution of marine paleobasin formation, sea level fluctuations and climate change.

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Частини книг з теми "Paleodelta"

Miller, Robert B., Scott R. Paterson, and Jennifer P. Matzel. "Plutonism at different crustal levels: Insights from the ~5–40 km (paleodepth) North Cascades crustal section, Washington." In Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic Processes. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.2456(05).

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Bianchi, Thomas S. "The Holocene and Global Climate Change." In Deltas and Humans. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199764174.003.0008.

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The Pleistocene Epoch, often referred to as the Ice Age, lasted from approximately 2.6 million to 11,700 years ago. The last major ice advance began about 110,000 years ago, and the most recent episode of maximum ice coverage, the Last Glacial Maximum, began about 26,500 years ago and ended approximately 19,000 years ago. Thereafter, glacier retreat began, largely ending by about 11,700 years ago. That marked the beginning of the Holocene interglacial geologic epoch, which continues to the present. During the last glacial period, sea level was much lower because so much water was locked up in ice sheets, largely at the poles. This lowering of the sea level exposed the margins of the continents (the continental shelves) around the world. When the Ice Age ended, sea level started to rise during the deglacial period, a process that continued into the Holocene. Deltaic regions received meltwaters from the thawing glaciers, along with glacier- derived sediments. Of particular note in the late Holocene is a climate episode called the Medieval Warm Period, originally identified by the English botanist Hubert Lamb. The Medieval Warm Period was a time of warm climate in the North Atlantic region and may have also impacted other areas around the world. It lasted from about the years 950 to 1250. Later in this chapter, I will discuss this climate anomaly, along with something called the “Hockey Stick” debate, which relates to exceptional warming during recent centuries of the Holocene (i.e., global warming). In any case, all modern and paleodeltas formed during periods of peak sea level in the Holocene. These new deltas had fertile soils that were constantly irrigated by the flow of fresh water, which promoted early settlement by humans. So, the Holocene started near the end of the retreat of the Pleistocene glaciers, and human civilizations arose entirely in the Holocene Epoch. To view the Holocene, simply look around you today. In this chapter, I will explore the natural and human-induced causes of global climate change and how they impact deltaic regions.

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Seltmann, Reimar, Richard J. Goldfarb, Bo Zu, Robert A. Creaser, Alla Dolgopolova, and Vitaly V. Shatov. "Chapter 24: Muruntau, Uzbekistan: The World’s Largest Epigenetic Gold Deposit." In Geology of the World’s Major Gold Deposits and Provinces, 497–521. Society of Economic Geologists, 2020. http://dx.doi.org/10.5382/sp.23.24.

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Abstract Muruntau in the Central Kyzylkum desert of the South Tien Shan, western Uzbekistan, with past production of ~3,000 metric tons (t) Au since 1967, present annual production of ~60 t Au, and large remaining resources, is the world’s largest epigenetic Au deposit. The host rocks are the mainly Cambrian-Ordovician siliciclastic flysch of the Besapan sequence. The rocks were deformed into a broadly east-west fold-and-thrust belt prior to ca. 300 Ma during ocean closure along the South Tien Shan suture. A subsequent tectonic transition was characterized by left-lateral motion on regional splays from the suture and by a massive thermal event documented by widespread 300 to 275 Ma magmatism. The Besapan rocks were subjected to middle to upper greenschist-facies regional metamorphism, an overprinting more local thermal metamorphism to produce a large hornfels aureole, and then Au-related hydrothermal activity all during early parts of the thermal event. The giant Muruntau Au deposit formed in the low-strain hornfels rocks at ca. 288 Ma at the intersection of one of the east-west splays, the Sangruntau-Tamdytau shear zone, with a NE-trending regional fault zone, the Muruntau-Daugyztau fault, which likely formed as a cross fault during the onset of left-lateral translation on the regional splays. Interaction between the two faults opened a large dilational zone along a plunging anticlinorium fold nose that served as a major site for hydrothermal fluid focusing. The Au ores are dominantly present as a series of moderately to steeply dipping quartz ± K-feldspar stockwork systems surrounding uncommon central veins and with widespread lower Au-grade metasomatites (i.e., disseminated ores). Pervasive alteration is biotite-K-feldspar, although locally albitization is dominant. Sulfides are mainly arsenopyrite, pyrite, and lesser pyrrhotite, and scheelite may be present both in preore ductile veins and in the more brittle auriferous stockwork systems. The low-salinity, aqueous-carbonic ore-forming fluids probably deposited the bulk of the ore at 400° ± 50°C and 6-to 10-km paleodepth. The genesis of the deposit remains controversial with metamorphic, thermal aureole gold (TAG), and models related to mantle upwelling all having been suggested in recent years. More importantly, the question as to why there was such a focusing of so much Au and fluid into this one location, forming an ore system an order of magnitude larger than other giant Au deposits in metamorphic terranes, remains unresolved.

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Hoiland, C., J. Hourigan, and E. Miller. "Evidence for large departures from lithostatic pressure during Late Cretaceous metamorphism in the northern Snake Range metamorphic core complex, Nevada." In Tectonic Evolution of the Sevier-Laramide Hinterland, Thrust Belt, and Foreland, and Postorogenic Slab Rollback (180–20 Ma). Geological Society of America, 2022. http://dx.doi.org/10.1130/2021.2555(07).

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ABSTRACT The highest-grade Barrovian-type metamorphic rocks of the North American Cordillera exposed today are Late Cretaceous in age and found within an orogen-parallel belt of metamorphic core complexes for which the tectonic histories remain controversial. Thermobarometric studies indicate that many of these Late Cretaceous metamorphic assemblages formed at pressures of >8 kbar, conventionally interpreted as >30 km depth by assuming lithostatic conditions. However, in the northern Basin and Range Province, detailed structural reconstructions and a growing body of contradictory geologic data in and around the metamorphic core complexes indicate these metamorphic rocks are unlikely to have ever been buried any deeper than ~15 km depth (~4 kbar, lithostatic). Recent models controversially interpret this discrepancy as the result of “tectonic overpressure,” whereby the high-grade mineral assemblages were formed under superlithostatic conditions without significant tectonic burial. We performed several detailed studies within the Snake Range metamorphic core complex to test the possibility that cryptic structures responsible for additional burial and exhumation might exist, which would refute such a model. Instead, our data highlight the continued discordance between paleodepth and paleopressure and suggest the latter may have reached nearly twice the lithostatic pressure in the Late Cretaceous. First, new detrital zircon U-Pb geochronology combined with finite-strain estimates show that prestrain thicknesses of the lower-plate units that host the high-pressure mineral assemblages correspond closely to the thicknesses of equivalent-age units in adjacent ranges rather than to those of the inferred, structurally overridden (para) autochthon, inconsistent with cross sections and interpretations that assume a lower plate with a deeper origin for these rocks. Second, new Raman spectroscopy of carbonaceous material of upper- and lower-plate units identified an ~200 °C difference in peak metamorphic temperatures across the northern Snake Range detachment but did not identify any intraplate discontinuities, thereby limiting the amount of structural excision to motion on the northern Snake Range detachment itself, and locally, to no more than 7–11 km. Third, mapped geology and field relationships indicate that a pre-Cenozoic fold truncated by the northern Snake Range detachment could have produced ~3–9 km of structural overburden above Precambrian units, on the order of that potentially excised by the northern Snake Range detachment but still far short of expected overburden based on lithostatic assumptions. Fourth, finite-strain measurements indicate a shortening (constrictional) strain regime favorable to superlithostatic conditions. Together, these observations suggest that pressures during peak metamorphism may have locally reached ~150%–200% lithostatic pressure. Such departures from lithostatic conditions are expected to have been most pronounced above regions of high heat flow and partial melting, and/or at the base of regional thrust-bounded allochthons, as is characteristic of the spatial distribution of Cordilleran metamorphic core complexes during the Late Cretaceous Sevier orogeny.

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Тези доповідей конференцій з теми "Paleodelta"

Alexander, Jason S., Brandon McElroy, and Marissa Murr. "MINDING THE GAPS—FLUVIAL PALEODEPTH REVISITED." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-286076.

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Vasilev, Atanas, Nikola Botusharov, Rositsa Pehlivanova, Petar Petsinski, and Eva Marinovska. "BLACK SEA GAS HYDRATES: RESOURCE ESTIMATION UPDATE." In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023/1.1/s06.77.

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The Black Sea exhibits significant potential for the development of substantial gas hydrate reserves, primarily due to its low salinity, extensive sedimentary complexity, and the presence of vast deep-sea buried paleodeltas. Recent geophysical and geochemical studies carried out as part of European and national projects have yielded valuable data and outcomes, serving as the basis for a reassessment of gas hydrates in the Black Sea. This research aims to provide an updated estimation of the Black Sea gas hydrate resources and assess the potential for methane, hydrogen, and sequestered carbon dioxide as hydrate within each exclusive economic zone. Our methodology involves incorporating updated input data from recent publications and analyzing the results of detailed investigations to establish more precise parameters. The key findings reveal how detailed explorations have changed the area of gas hydrate deposits (BSR areas), the portion of sediments containing gas hydrates within the gas hydrate stability zone, and the gas hydrate saturation of the pore volume. The updated resource estimation is presented through maps and tables. These new findings contribute to a better understanding of the Black Sea basin's potential for carbon capture and robust storage in gas hydrate deposits, as well as the prospects for gas hydrate development in each country surrounding the Black Sea.

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