Was the Late Ordovician mass extinction truly exceptional?

Trends in Ecology & Evolution, Год журнала: 2023, Номер 38(9), С. 812 - 821

Опубликована: Май 12, 2023

Язык: Английский

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Organic matter accumulation mechanisms in the Wufeng-Longmaxi shales in western Hubei Province, China and paleogeographic implications for the uplift of the Hunan-Hubei Submarine high

International Journal of Coal Geology, Год журнала: 2023, Номер 270, С. 104223 - 104223

Опубликована: Март 22, 2023

Язык: Английский

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Evolution of black shale sedimentary environment and its impact on organic matter content and mineral composition: a case study from Wufeng-Longmaxi Formation in Southern and Eastern Sichuan Basin

Frontiers in Environmental Science, Год журнала: 2024, Номер 12

Опубликована: Май 6, 2024

Due to global geological events and differences in regional sedimentary environments, marine shale reservoirs of Wufeng-Longmaxi Formation Eastern Southern Sichuan Basin exhibit significant heterogeneity organic matter content mineral composition. In order reveal the influence paleoenvironment evolution on reservoir heterogeneity, key geochemical indicators elements were used reconstruct environment Basin. The mechanism components was also explored. results indicate that can be divided into two third-order sequences (Sq 1 Sq 2). Each sequence is a transgressive system tract (TST) highstand (HST). average TOC highest during TST1 period with reaching 4.2%, while reached its maximum at 3.9% TST2 high paleo-productivity, accumulation quartz eastern region higher than those southern from middle period. However, late lower due dilution terrestrial debris. During HST2 period, clay adsorption preservation condition, slightly increased early stage. At same time, has minerals low strong weathering intensity input coarse-grained debris (silt-size quartz).

Язык: Английский

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Relative Sea-Level Fluctuations during Rhuddanian–Aeronian Transition and Its Implication for Shale Gas Sweet Spot Forming: A Case Study of Luzhou Area in the Southern Sichuan Basin, SW China

Journal of Marine Science and Engineering, Год журнала: 2023, Номер 11(9), С. 1788 - 1788

Опубликована: Сен. 13, 2023

Most scholars believe that transgression events can contribute positively to organic matter enrichment and shale gas sweet spot development, while whether or not regression are conducive development remains be further discussed. Variations in carbon content (TOC), major trace elements at the Rhuddanian–Aeronian stage Luzhou area, southern margin of Sichuan Basin, were analyzed this paper. We discuss differences paleoenvironment during regression. A transgressive system tract (TST) occurred early Rhuddanian stage, highstand tracts (Ehst-1 Ehst-2) late Aeronian a (LHST) developed stage. rise sea level TST upper Yangtze resulted an anoxic environment, where continuous upwelling current brought about large number nutrients seawater, significantly increasing paleoproductivity. Strong tectonic subsidence, weak chemical weathering, rising together led low terrigenous debris supply catchment area. Therefore, paleoproductivity redox conditions primary controlling factors with clastic secondary importance. With advance Guangxi orogeny, EHST-1, EHST-2, LHST stages was mainly controlled by supply. comparison key physical parameters geochemical indicators reservoirs from these four suggests two types (type I II) occurring EHST-2 stages. High TOC high microcrystalline quartz developing type spots, enhanced bottom water caused ephemeral, small-scale rises main determinant class II spots later EHST

Язык: Английский

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High-resolution Re-Os isotope stratigraphy, and geochemical fingerprints identification of Late Ordovician–Early Silurian strata in northern Guizhou, China: Implications for LOME and environmental changes

Earth-Science Reviews, Год журнала: 2023, Номер 243, С. 104497 - 104497

Опубликована: Июль 11, 2023

Язык: Английский

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Applications of mercury stable isotopes for tracing volcanism in the geologic record

Science China Earth Sciences, Год журнала: 2024, Номер 67(5), С. 1436 - 1458

Опубликована: Апрель 17, 2024

Язык: Английский

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The impact catastrophism and Alvarez theory of mass extinctions in a retrospective, perspective and prospective: towards the Phanerozoic impact event stratigraphy

Earth-Science Reviews, Год журнала: 2024, Номер 259, С. 104904 - 104904

Опубликована: Авг. 31, 2024

Язык: Английский

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