气候变化领域集成服务门户(CCPortal): Sulfate-controlled marine euxinia in the semi-restricted inner Yangtze Sea (South China) during the Ordovician-Silurian transition

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DOI	10.1016/j.palaeo.2019.109281
	Sulfate-controlled marine euxinia in the semi-restricted inner Yangtze Sea (South China) during the Ordovician-Silurian transition
	Li N.; Li C.; Fan J.; Algeo T.J.; Yan D.; Zhu G.; Wu S.; Tang S.; Cheng M.; Jin C.
发表日期	2019
ISSN	0031-0182
卷号	534
英文摘要	Conflicting published interpretations of marine redox conditions during the Ordovician-Silurian transition (OST) may have been linked to spatial redox heterogeneity during this interval. However, details of the pattern of redox heterogeneity and its underlying causes remain unclear. Here, we present a high-resolution geochemical study of a drillcore section (Pengye #1) from Pengshui County (Chongqing municipality, southwestern China) that was located in the semi-restricted inner Yangtze Sea during the OST. We analyzed Fe-speciation, redox-sensitive trace elements, major elements, and pyrite δ34S compositions (δ34Spy) and then compared these data with published results from coeval sections at Datianba and Shuanghe in the same basin. The integrated dataset demonstrates pronounced spatiotemporal heterogeneity of redox conditions—especially the local development of euxinic conditions in the inner Yangtze Sea during the OST. Integrated data further suggest that high primary productivity and ample Fe fluxes in the inner Yangtze Sea may have depleted dissolved sulfate through microbial sulfate reduction (MSR) and subsequent pyrite formation, except in areas with enhanced sulfate supply from continental weathering or open-ocean exchange, which varied as a function of both tectonic (i.e., the regional Kwangsian Orogeny) and eustatic changes (i.e., the global Hirnantian glaciation). Limited sulfate availability thus likely prevented the development of euxinic conditions in some regions of the inner Yangtze Sea, as reflected in spatial variation of δ34Spy. Our study highlights the potential role of sulfate availability on the development of watermass euxinia in semi-restricted marginal-marine basins during the OST. © 2019 Elsevier B.V.
英文关键词	Fe speciation; Hirnantian glaciation; Longmaxi Formation; Redox conditions; Sulfur isotopes; Wufeng Formation
语种	英语
scopus关键词	euxinic environment; glaciation; heterogeneity; Hirnantian; iron; Ordovician-Silurian boundary; primary production; pyrite; redox conditions; reduction; spatial variation; spatiotemporal analysis; speciation (chemistry); sulfate; sulfur isotope; China; Chongqing; Hubei; Shuanghe
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150799
作者单位	State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China; School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, 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, United States; Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, 430074, China; Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China; School of Earth and Environment, Anhui University of Science & Technology, Huainan, 232001, China
推荐引用方式 GB/T 7714	Li N.,Li C.,Fan J.,et al. Sulfate-controlled marine euxinia in the semi-restricted inner Yangtze Sea (South China) during the Ordovician-Silurian transition[J],2019,534.
APA	Li N..,Li C..,Fan J..,Algeo T.J..,Yan D..,...&Jin C..(2019).Sulfate-controlled marine euxinia in the semi-restricted inner Yangtze Sea (South China) during the Ordovician-Silurian transition.Palaeogeography, Palaeoclimatology, Palaeoecology,534.
MLA	Li N.,et al."Sulfate-controlled marine euxinia in the semi-restricted inner Yangtze Sea (South China) during the Ordovician-Silurian transition".Palaeogeography, Palaeoclimatology, Palaeoecology 534(2019).