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A toarcian Ocean anoxic event record from an open-ocean setting in the eastern Tethys: Implications for global climatic change and regional environmental perturbation

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Science China Earth Sciences 2021年第11期64卷 1860-1872页

作者： Xiugen FU Jian WANG Huaguo WEN Chunyan SONG Zhongwei WANG Shengqiang ZENG Xinglei FENG Hengye WEI State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610050China School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China Chengdu Center China Geological SurveyChengdu 610081China Qiangtang Institute of Sedimentary Basin Southwest Petroleum UniversityChengdu 610500China

The Early toarcian“oceanic anoxic event”(T-OAE)is recorded by marked disruption to both the climate system and marine ***,we present intergraded high-resolution carbon-isotope data(δ^(13)C),bulk geochemistry,mineral characterization from an open-ocean setting in the eastern *** these data,we(1)construct the high-resolution record of the T-OAE from an open-ocean setting in the eastern Tethys;(2)show that the T-OAE in the Sewa succession was marked by coarser-grained deposits associated with high-energy conditions within the otherwise low-energy claystone deposits that likely linked to a globally increased supply of clastic sediments into marginal and deeper marine basin;(3)propose that the low C_(org):P_(total) ratios,in combination with bioturbated structure and depletion or slight enrichment in redox-sensitive trace elements of V,Mo,and U suggest a long-term oxygenation event throughout the T-OAE interval at the Sewa succession,and hence,anoxia may not play a fundamental role during the toarcian negative CIE in this setting;(4)exhibit that a warming and more humid climate began at the start of the T-OAE,and many episodic changes in sediment provenance throughout the T-OAE interval occurred at this location;and(5)suggest that accumulation of organic-matter sediments during the T-OAE is generally controlled by global climatic changes,but a regional environmental perturbation also might influence the preservation of organic matter.

关键词： toarcian oceanic anoxic event Carbonate carbon isotopes Shallow marine Oxygen-rich conditions Eastern Tethys

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