气候变化领域集成服务门户(CCPortal): Cooling-driven oceanic anoxia across the Smithian/Spathian boundary (mid-Early Triassic)

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DOI	10.1016/j.earscirev.2019.01.009
	Cooling-driven oceanic anoxia across the Smithian/Spathian boundary (mid-Early Triassic)
	Song H.; Du Y.; Algeo T.J.; Tong J.; Owens J.D.; Song H.; Tian L.; Qiu H.; Zhu Y.; Lyons T.W.
发表日期	2019
ISSN	00128252
起始页码	133
结束页码	146
卷号	195
英文摘要	The Smithian/Spathian boundary (SSB) represents a major climatic-oceanic-biotic event within the ~5-Myr-long recovery interval of the Early Triassic following the end-Permian mass extinction. The SSB was associated with pronounced cooling following the middle Smithian hyper-greenhouse, a ~ +2 to +8‰ positive carbon isotope excursion, and a second-order mass extinction, yet its underlying cause(s) remain poorly understood. Here, we review oceanic environmental changes during the middle Smithian to early Spathian interval and their potential mechanisms. In addition, we undertook an analysis of the carbon‑sulfur‑iron (C-S-Fe) systematics of the South Majiashan section, which was located on the paleo-western margin of the South China Craton during the Early Triassic, to better understand the causation of these environmental changes. This analysis revealed low δ13Ccarb (i.e., the N3 minimum) in the middle Smithian but rapidly rising δ13Ccarb (i.e., to the P3 maximum) and δ34SCAS within the SSB interval (i.e., late Smithian-earliest Spathian). Both the middle Smithian and SSB intervals are marked by development of marine euxinia, which we hypothesize had fundamentally different causes. The middle Smithian was associated with hyperwarming (the “Smithian Thermal Maximum”), which was probably triggered by a peak in magmatic activity of the Siberian Traps LIP. In contrast, the SSB interval was associated with global climatic cooling, which may have stimulated oceanic overturning circulation and upwelling on continental margins, leading to transient local increases in marine productivity and expansion of oceanic oxygen-minimum zones (OMZs). The concurrent positive excursions in δ13Ccarb and δ34SCAS at South Majiashan and other sections worldwide are evidence of enhanced burial of organic carbon and pyrite on a regional or global scale, as well as of a concurrent decline in atmospheric pCO2 that may have positively re-enforced the SSB cooling event. © 2019 Elsevier B.V.
关键词	Carbon isotopes Organic carbon burial Primary productivity South China Sulfur isotopes
英文关键词	anoxia; carbon isotope; chemostratigraphy; cooling; isotopic composition; organic carbon; Permian; primary production; sulfur isotope; Triassic; China
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/203557
作者单位	State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; 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; Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32306-4520, United States; Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China; Wuhan Institute of Geology and Mineral Resources, Wuhan, 430205, China; Department of Earth Sciences, University of California, Riverside, CA 92521, United States
推荐引用方式 GB/T 7714	Song H.,Du Y.,Algeo T.J.,et al. Cooling-driven oceanic anoxia across the Smithian/Spathian boundary (mid-Early Triassic)[J],2019,195.
APA	Song H..,Du Y..,Algeo T.J..,Tong J..,Owens J.D..,...&Lyons T.W..(2019).Cooling-driven oceanic anoxia across the Smithian/Spathian boundary (mid-Early Triassic).Earth Science Reviews,195.
MLA	Song H.,et al."Cooling-driven oceanic anoxia across the Smithian/Spathian boundary (mid-Early Triassic)".Earth Science Reviews 195(2019).