【摘 要】
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The Early Toarcian “Oceanic Anoxic Event” (T-OAE) is recorded by marked disruption to both the climate system and marine ecosystems.Here,we present intergraded high-resolution carbon-isotope data (δ13C),bulk geochemistry,mineral characterization from an o
【机 构】
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State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum Universit
论文部分内容阅读
The Early Toarcian “Oceanic Anoxic Event” (T-OAE) is recorded by marked disruption to both the climate system and marine ecosystems.Here,we present intergraded high-resolution carbon-isotope data (δ13C),bulk geochemistry,mineral characterization from an open-ocean setting in the eastern Tethys.With 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 elastic sediments into marginal and deeper marine basin;(3) propose that the low Corg∶Ptotal 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.
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