气候变化领域集成服务门户(CCPortal): Global-ocean circulation changes during the Smithian–Spathian transition inferred from carbon‑sulfur cycle records

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DOI	10.1016/j.earscirev.2019.01.010
	Global-ocean circulation changes during the Smithian–Spathian transition inferred from carbon‑sulfur cycle records
	Lyu Z.; Zhang L.; Algeo T.J.; Zhao L.; Chen Z.-Q.; Li C.; Ma B.; Ye F.
发表日期	2019
ISSN	00128252
起始页码	114
结束页码	132
卷号	195
英文摘要	Early Triassic marine ecosystems experienced multiple environmental perturbations and a delayed biotic recovery following the end-Permian mass extinction. The Smithian–Spathian boundary (SSB), in the late Early Triassic, marks a major shift toward a less intensely warm climate, ameliorated marine environmental conditions, and the onset of a more sustained recovery of marine faunas. Accumulating geochemical evidence indicates that these developments were accompanied by large changes in global-ocean circulation during the Smithian–Spathian (S–S) transition. In the present study, tandem carbon and sulfur isotopic records were used to investigate changes in the marine carbon and sulfur cycles across the SSB and their potential relationship to global-ocean circulation changes. First, we conducted a carbon‑sulfur isotope study at two deepwater SSB sections (West Pingdingshan and Jiarong) in South China. High-resolution δ13Ccarb-δ34SCAS profiles show large positive excursions and strong correlations through the S–S transition, suggesting control by co-burial of organic matter and pyrite. Second, we reviewed global carbon‑sulfur isotope studies through the Smithian and Spathian substages. Similar to carbonate carbon isotopes, sulfate sulfur isotopes also show vertical gradient changes during the S–S transition. We link these changes to an expansion of oceanic oxygen-minimum zones (OMZs) in response to a cooling-driven re-invigoration of global-ocean circulation that triggered enhanced productivity on platform margins. OMZ expansion may have contributed to a second-order extinction among conodonts and ammonoids at the SSB, but the long-term shift toward more vigorous ocean circulation and better-ventilated watermasses is likely to have facilitated the overall recovery of marine biotas during the Spathian Substage of the late Early Triassic. © 2019 Elsevier B.V.
关键词	Carbon isotopes Early Triassic Pyrite Redox condition South China Sulfur isotopes
英文关键词	carbon isotope; global ocean; oceanic circulation; oxygen minimum layer; paleoceanography; pyrite; redox conditions; sulfur cycle; Triassic; China; Ammonoidea
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203496
作者单位	State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, United States; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China
推荐引用方式 GB/T 7714	Lyu Z.,Zhang L.,Algeo T.J.,等. Global-ocean circulation changes during the Smithian–Spathian transition inferred from carbon‑sulfur cycle records[J],2019,195.
APA	Lyu Z..,Zhang L..,Algeo T.J..,Zhao L..,Chen Z.-Q..,...&Ye F..(2019).Global-ocean circulation changes during the Smithian–Spathian transition inferred from carbon‑sulfur cycle records.Earth Science Reviews,195.
MLA	Lyu Z.,et al."Global-ocean circulation changes during the Smithian–Spathian transition inferred from carbon‑sulfur cycle records".Earth Science Reviews 195(2019).