globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.10.006
论文题名:
Global and regional controls on marine redox changes across the Ordovician-Silurian boundary in South China
作者: Liu Y.; Li C.; Algeo T.J.; Fan J.; Peng P.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 463
起始页码: 180
结束页码: 191
语种: 英语
英文关键词: Anoxia ; Black shale ; Fe speciation ; Hirnantian glaciation ; Kwangsian Orogeny ; Yangtze Platform
英文摘要: The Ordovician-Silurian (O-S) transition coincided with significant environmental and biological changes. In South China, the Yangtze Platform experienced both global and regional events at this time, including sea-level fluctuations, tectonic movements, volcanic eruptions, mass extinction, and widespread anoxia. The O-S transitional strata of the Yangtze Platform comprise organic-rich black shales that are an important oil source rock. To explore the evolution of watermass chemistry and its relationship to organic matter accumulation, we conducted an integrated Fe-S-C geochemical study (i.e., Fe-speciation, δ13Corg, δ34Spy, pyrite-S and TOC) of the O-S boundary sections at Datianba (Chongqing Municipality) and Shuanghe (Sichuan Province). These sections were located in the restricted inner Yangtze Sea, in contrast to the previously studied Wangjiawan section, which was deposited in a more open setting of the outer Yangtze Sea. In contrast to the well-oxygenated conditions at Wangjiawan, the Datianba and Shuanghe sections record persistently anoxic, and episodically euxinic, conditions during the Hirnantian, which can be explained by the unique paleogeography and restricted hydrography of the inner Yangtze Sea. We propose that the regional Kwangsian Orogeny, which was driven by collision of the Yangtze and Cathaysia blocks, played a key role in basin development, watermass chemistry changes, and accumulation of Wufeng Formation black shales within the Yangtze Sea. The more widespread black shales of the Lower Silurian Lungmachi Formation were linked to the post-Hirnantian global marine transgression. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68194
Appears in Collections:过去全球变化的重建

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作者单位: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry of CAS, Guangzhou, China; University of Chinese Academy of Sciences, Beijing, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, China; Department of Geology, University of Cincinnati, Cincinnati, OH, United States; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China

Recommended Citation:
Liu Y.,Li C.,Algeo T.J.,et al. Global and regional controls on marine redox changes across the Ordovician-Silurian boundary in South China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,463
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