Littérature scientifique sur le sujet « Paleoreconstruction »

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Articles de revues sur le sujet "Paleoreconstruction"

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Neplyukhina, A. A. « Diatoms of the Aleutian Islands (Alaska, USA) in the Holocene ». Limnology and Freshwater Biology, no 4 (2022) : 1509–11. http://dx.doi.org/10.31951/2658-3518-2022-a-4-1509.

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Abstract. Here presented a short overview of paleoreconstruction works started since 2018 for the Aleutian Islands region. Material is from four Aleutian Islands that represented by peat deposits and modern waterbodies samples are studied. Modern and fossil diatom communities of these islands are described, diatom analyses and paleoreconstructions are performed.
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Ts Pintaeva, E. « Lipid biomarkers in paleoreconstruction of lake sedimentogenesis ». IOP Conference Series : Earth and Environmental Science 320 (29 août 2019) : 012016. http://dx.doi.org/10.1088/1755-1315/320/1/012016.

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Maznev, S. V. « The Anthropocene evolution of the Aral Sea ice gouging derived from the bottom topography ». Limnology and Freshwater Biology, no 4 (2022) : 1495–96. http://dx.doi.org/10.31951/2658-3518-2022-a-4-1495.

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Abstract. Ice gouging landforms on the exposed bottom of the Aral Sea give a possibility to get a profound knowledge about processes of the ice-bottom interaction during the level fall. We analyzed ice scours in the different parts of the Aral Sea using geomorphological and remote methods and evaluated the paleoreconstruction of ice gouging processes in the Anthropocene.
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Castellano, E., M. Severi, R. Traversi, S. Becagli et R. Udisti. « Paleoreconstruction of volcanic history inferred from glacio-chemical ice core analyses ». PAGES news 13, no 3 (novembre 2005) : 3–5. http://dx.doi.org/10.22498/pages.13.3.3.

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Unger, A. V., A. M. Nikishin, M. A. Kuzlyapina et A. P. Afanasenkov. « History of the inversion megaswells of the Yenisei-Khatanga basin development ». Moscow University Bulletin. Series 4. Geology, no 2 (28 avril 2017) : 8–15. http://dx.doi.org/10.33623/0579-9406-2017-2-8-15.

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Paper presents description of Balakhninsky and Rassohinsky swells, which were located in the central part of the Yenisei-Khatanga Basin by seismic and drilling data, and the results of its geological structure comparative analysis. History of swells formation discussed in de- tails, including rift initiation in the Late Permian-Early Triassic time and stages of inversion structures growth intensification in the Middle Triassic, Late Jurassic, Early Cretaceous and Cenozoic time. Asynchronous development of these structures established on the base of paleoreconstruction analysis.
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Nikitina, E., et E. Pintaeva. « A new approach to paleoreconstruction of Gusinoe Lake sediments : lipid biomarker analysis ». Limnology and Freshwater Biology, no 4 (2020) : 573–74. http://dx.doi.org/10.31951/2658-3518-2020-a-4-573.

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Macreadie, Peter I., Katie Allen, Brendan P. Kelaher, Peter J. Ralph et Charles G. Skilbeck. « Paleoreconstruction of estuarine sediments reveal human‐induced weakening of coastal carbon sinks ». Global Change Biology 18, no 3 (23 novembre 2011) : 891–901. http://dx.doi.org/10.1111/j.1365-2486.2011.02582.x.

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Baskakova, G. V., et A. M. Nikishin. « Geological history of the Kerch-Taman area based on the reconstruction of the regional balanced section ». Moscow University Bulletin. Series 4. Geology, no 4 (28 août 2018) : 23–29. http://dx.doi.org/10.33623/0579-9406-2018-4-23-29.

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The geological framework and tectonics of the Eastern Black Sea region is characterized through balancing a geological cross-section and paleoreconstruction during the Paleogene-Neogene period. Studied area includes the Kerch-Taman Trough, the Anapa Swell (the continuation of the immersed part of the Greater Caucasus Orogen), the Tuapse trough and the Shatsky Swell. The paper is mainly focused on the Russian shelf zone of the Black sea. The results are important for understanding of the trap formation time and the hydrocarbon deposits preservation in the Russian sector of the Black sea shelf.
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Mißbach, H., J. P. Duda, N. K. Lünsdorf, B. C. Schmidt et V. Thiel. « Testing the preservation of biomarkers during experimental maturation of an immature kerogen ». International Journal of Astrobiology 15, no 3 (4 avril 2016) : 165–75. http://dx.doi.org/10.1017/s1473550416000069.

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AbstractLipid biomarkers have been extensively applied for tracing organisms and evolutionary processes through Earth's history. They have become especially important for the reconstruction of early life on Earth and, potentially, for the detection of life in the extraterrestrial realm. However, it is not always clear how exactly biomarkers reflect a paleoecosystem as their preservation may be influenced by increasing temperatures (T) and pressures (P) during burial. While a number of biomarker indices reflecting thermal maturity have been established, it is often less well constrained to which extent biomarker ratios used for paleoreconstruction are compromised by T and P processes. In this study we conducted hydrous pyrolysis of Green River Shale (GRS) kerogen in gold capsules for 2–2400 h at 300°C to assess the maturation behaviour of several compounds used as life tracers and for the reconstruction of paleoenvironments (n-alkanes, pristane, phytane, gammacerane, steranes, hopanes and cheilanthanes). Lignite samples were maturated in parallel with the GRS kerogen to obtain exact vitrinite reflectance data at every sampling point. Our experiment confirms the applicability of biomarker-based indices and ratios as maturity indicators (e.g. total cheilanthanes/hopanes ratio; sterane and hopane isomerization indices). However, several biomarker ratios that are commonly used for paleoreconstructions (e.g. pristane/phytane, pristane/n-C17, phytane/n-C18 and total steranes/hopanes) were considerably affected by differences in the thermal degradation behaviour of the respective compounds. Short-term experiments (48 h) performed at 400°C also revealed that biomarkers >C15 (especially steranes and hopanes) and ‘biological’ chain length preferences for n-alkanes are vanished at a vitrinite reflectance between 1.38 and 1.83% RO. Our data highlight that ‘thermal taphonomy’ effects have to be carefully considered in the interpretation of biomarkers in ancient rocks and, potentially, extraterrestrial materials.
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Tessier, Bernadette. « Upper intertidal rhythmites in the Mont-Saint-Michel Bay (NW France) : Perspectives for paleoreconstruction ». Marine Geology 110, no 3-4 (mars 1993) : 355–67. http://dx.doi.org/10.1016/0025-3227(93)90093-b.

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Thèses sur le sujet "Paleoreconstruction"

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Bartoloni, Chiara. « Palynological content of surface sediments offshore Myanmar : a modern dataset for paleoreconstructions ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Palynology is the study of microscopic organic-walled organism remains, called palynomorphs and consisting of different groups of planktonic and benthic microorganisms. They can be preserved in the sediments and applied as proxies to reconstruct paleoenvironmental and paleoclimatic conditions. Among marine palynomorphs, dinoflagellate cysts (dinocysts) are regarded as one of the most useful (paleo-)environmental indicators, occurring in all aquatic environments. The main aim of this study is to improve the knowledge on palynomorphs spatial distribution patterns offshore Myanmar in relationship to the organic matter composition (C/N), concentration (TOC) and to the relative position to riverine and coastal systems. In this uninvestigated area, 29 surface sediment samples were analyzed for their palynofacies composition, focusing on dinocysts content and distribution also to investigate the significance of specific palynological ratios (e.g., Protoperidinioid vs. Gonyaulacoid dinocysts and pollen and spores vs. dinocysts) as proxies for paleoreconstructions.
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Schreiner, Kathryn 1983. « Paleoreconstruction of Particulate Organic Carbon Inputs to the High-Arctic Colville River Delta, Beaufort Sea, Alaska ». Thesis, 2013. http://hdl.handle.net/1969.1/149229.

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High Arctic permafrosted soils represent a massive sink in the global carbon cycle, accounting for twice as much carbon as what is currently stored as carbon dioxide in the atmosphere. However, with current warming trends this sink is in danger of thawing and potentially releasing large amounts of carbon as both carbon dioxide and methane into the atmosphere. It is difficult to make predictions about the future of this sink without knowing how it has reacted to past temperature and climate changes. This dissertation summarizes the results of the first study to look at long term, fine scale organic carbon delivery by the high-Arctic Colville River into Simpson’s Lagoon in the near-shore Beaufort Sea. Modern delivery of organic carbon to the Lagoon was determined to come from a variety of sources through the use of a three end-member mixing model and sediment biomarker concentrations. These sources include the Colville River in the western area of the Lagoon near the river mouth, marine sources in areas of the Lagoon without protective barrier islands, and coastal erosional sources and the Mackenzie River in the eastern area of the Lagoon. Downcore organic carbon delivery was measured on two cores in the Lagoon, one taken near the mouth of the Colville River (spans about 1800 years of history) and one taken on the eastern end of the Lagoon (spans about 600 years of history). Bulk organic parameters and biomarkers were measured in both cores and analyzed with Principle Component Analysis to determine long-term trends in organic carbon delivery. It was shown that at various times in the past, highly degraded organic carbon inputs of what is likely soil and peat carbon were delivered to the Lagoon. At other times, inputs of fresher, non-degraded, terrestrially-derived organic carbon inputs of what are likely higher amounts of plant and vegetative material was delivered to the Lagoon. Inputs of degraded soil carbon were also shown to correspond to higher temperatures on the North Slope of Alaska, likely indicating that warmer temperatures lead to a thawing of permafrost and in turn organic carbon mobilization to the coastal Beaufort Sea.
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Sojo, Gamboa. « Late Quaternary paleoceanographic variations in the eastern Greenland Sea, Barents Sea and Spitsbergen fjords inferred by the foraminiferal assemblages and sedimentological records ». Doctoral thesis, 2021. http://hdl.handle.net/2158/1237976.

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The Arctic area is responding more rapidly to global warming than most other areas on our planet. The identification of sedimentary systems and processes in the Arctic area allows the reconstruction of its palaeoclimatic and palaeoenvironmental evolution during the Quaternary period. This work consists of the study of three sites located in the Fram Strait (eastern Greenland Sea), in the western Spitsbergen Fjords and in the northwestern edge of the Barents Sea, corresponding with diverse geographical, morphological and oceanographical settings. These sites are all located along the main incoming pathway of the Atlantic Water (AW) into the Arctic area, allowing to reconstruct the oceanographical changes during the last 12 kyr BP, with a special focus on the last centuries. Thus, the overall aim of this PhD Thesis is to improve the knowledge of the centennial and decadal climatic variations and ocean circulation and to trace the AW impact into the Arctic area during the upper Pleistocene and Holocene. A multiproxy (e.g. planktic and benthic foraminifera, sediment lithology) investigation is applied to a long marine sediment core recovered from the Bellsund Drift depocenter and six short cores from Bellsund Drift, a coastal fjord and the Kveithola Trough. The sedimentary record of the Calypso piston core (GS191-01PC, 1647m water depth), records the Upper Pleistocene (12.05 to 11.7 kyr BP), and an expanded Holocene sequence (more than 5 m thick, 11.7 to 0.63 kyr BP). The millennial record of the Bellsund Drift indicates a general progressive increase of the bottom and superficial water temperature, due to the incoming of the warm AW and the decreasing of sea ice extent. In the same area, I also analysed a box-corer (20 cm length, 1647 m water depth), which records the climatic variations of the Modern Period (MP, 1890 A.D. to present). My results indicate a general warm increment during the entire MP, interrupted by short cold events of about ca. 5 years. In the Kongsfjorden-Krossfjorden glacial system, a tidewater glacier fjord, (western margin of Svalbard) I analysed a multi-corer (32 cm at 105.6 m water depth), which records the last 60 years. This ice-covered area shows a decrease of the ice influence not directly related to the AW inflow, but indicated by the dominance of the cold ArW species related to meltwater and the no increment in the AW species. Four multi-cores collected along the Kveithola Trough are also studied (between 8 and 38 cm of sediment recovered and at water depths ranging from 376 m to 159 m) and correspond with the last part of the Little Ice Age (LIA) and Modern Period (MP). The foraminiferal assemblages indicate the passage from colder to warmer conditions during the last 350 years, conditioned by the morphology and geographical position of the trough. The palaeoenvironmental evolution of the bottom and the surface water masses indicate multiyear and decadal variations between warm and cold periods during the last c.a. two centuries, related to the interaction between the polar superficial cold-water and the warm bottom AW. The foraminiferal assemblages demonstrate increasing temperatures, but still the dominance of Arctic species, which are related to the continuing retreat of the sea ice, the reduction in the albedo and further favouring heat of the ocean surface; and the increase of the air temperature amplifying the input of heat in the area.
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Livres sur le sujet "Paleoreconstruction"

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McEIhinny, M. W., et D. A. Valencio. Paleoreconstruction of the Continents. Wiley & Sons, Limited, John, 2013.

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Antoshkina, A. I., V. A. Saldin, A. N. Sandula, N. Yu Nikulova, E. S. Ponomarenko, A. N. Shadrin, D. N. Shebolkin et N. A. Kaneva. Paleozoic sedimentation in the outer part of the shelf of NE European platform passive margin. Institute of Geology Komi SC UB RAS, 2011. http://dx.doi.org/10.19110/98491-029.

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The evolution of the Northern-Uralian sedomentaru basin in the Paleozoic is characterized on the basis of sedimentology, cyclic pattern and facies fistibution data. Paleoreconstructions of sedimentary environments were carried out applying new ideas on the Paleozoic stratigraphy. The event boundaries that changed the character of sedimentation are shown, and sedimentation models are built.
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Chapitres de livres sur le sujet "Paleoreconstruction"

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Smith, Alan G. « Plates and Paleoreconstructions ». Dans Encyclopedia of Solid Earth Geophysics, 1–6. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-10475-7_170-1.

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Smith, Alan G. « Plates and Paleoreconstructions ». Dans Encyclopedia of Solid Earth Geophysics, 998–1003. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-8702-7_170.

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Smith, Alan G. « Plates and Paleoreconstructions ». Dans Encyclopedia of Solid Earth Geophysics, 1274–80. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58631-7_170.

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Stepanova, A. Yu, et E. E. Taldenkova. « Ostracods in the sediments of the Arctic shelf seas of Eurasia (stratigraphy and paleoreconstruction) ». Dans THE BARENTS SEA SYSTEM, 95–109. Shirshov Institute of Oceanology Publishing House, 2021. http://dx.doi.org/10.29006/978-5-6045110-0-8/(9).

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We present data on ostracod assemblage analysis from the Laptev, Kara and White Seas in the Arctic Ocean. We established the relationship between modern ostracod distribution and environmental parameters and applied this knowledge to interpret fossil Quaternary ostracod assemblages. Data on distribution and ecological parameters for different modern Arctic and Boreal species give us an opportunity to interpret even taxonomically poor samples. Late Pleistocene-Holocene ostracod assemblages from the eastern Arctic shelves and their stratigraphic succession in the studied cores reflect the environmental transition during the gradual deepening of the sites and distance increase from the coastline during the Postglacial sea-level rise. Variations in fossil ostracod assemblages at the continental slope location suggest temporal increases in modified Atlantic water inflow, as well as point to periods of glacier meltwater and freshwater input. Late Saalian-Eemian assemblages from the White Sea area contain typical Arctic representatives as well as taxa inhabiting boreal and more southern locations and the majority of species present are known to tolerate decreased salinities. Assemblage changes reflect the transition from the initial stage of inundation, with active hydrodynamics, to stable marine conditions with subsequent warming and shallowing of the basin.
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Actes de conférences sur le sujet "Paleoreconstruction"

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Pavlov, V., A. Stupakova, R. Sautkin, A. Suslova et K. Osipov. « Paleoreconstruction of the Krasnoleninsky Field ». Dans Tyumen 2019. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201900631.

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Gritsenko, A., et A. Enilin. « Sedimentation and Tectonics Paleoreconstruction Approach in a Part of Fula Sub-basin (Sudan) ». Dans Saint Petersburg 2018. Netherlands : EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201800208.

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Astakhov, S., A. Perepelina, D. Spahic, K. Sokolov, O. Gutnik et V. Savenko. « 2d Basin Modeling and 2d Paleoreconstruction of Shaimskoe Petroliferous Region of West-Tokushinskaya Area ». Dans KazGeo 2012. Netherlands : EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20142928.

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Perepelina, A. N., D. Spahic, O. S. Gutnik et V. A. Savenko. « 2D Basin Modeling and 2D Paleoreconstruction of Shaimskoe Petroliferous Region of West-Tokushinskaya Area ». Dans Tyumen 2013 - New Geotechnology for the Old Oil Provinces. Netherlands : EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20142740.

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Karpenko, I. « Method of paleoreconstructions applied in seismic survey for oil and gas ». Dans 56th EAEG Meeting. European Association of Geoscientists & Engineers, 1994. http://dx.doi.org/10.3997/2214-4609.201410045.

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Pankov, V. V. « Modeling Paleoreconstructions Based on Geochemical Data and Complex Research of Clay Minerals ». Dans 76th EAGE Conference and Exhibition 2014. Netherlands : EAGE Publications BV, 2014. http://dx.doi.org/10.3997/2214-4609.20141625.

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