DOI: 10.1016/j.earscirev.2019.01.010
论文题名: Global-ocean circulation changes during the Smithian–Spathian transition inferred from carbon‑sulfur cycle records
作者: Lyu Z. ; Zhang L. ; Algeo T.J. ; Zhao L. ; Chen Z.-Q. ; Li C. ; Ma B. ; Ye F.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2019
卷: 195 起始页码: 114
结束页码: 132
语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165872
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Lyu Z.,Zhang L.,Algeo T.J.,et al. Global-ocean circulation changes during the Smithian–Spathian transition inferred from carbon‑sulfur cycle records[J]. Earth Science Reviews,2019-01-01,195