气候变化领域集成服务门户(CCPortal): The redox structure of Ediacaran and early Cambrian oceans and its controls

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DOI	10.1016/j.scib.2020.09.023
	The redox structure of Ediacaran and early Cambrian oceans and its controls
	Li C.; Shi W.; Cheng M.; Jin C.; Algeo T.J.
发表日期	2020
ISSN	20959273
起始页码	2141
结束页码	2149
卷号	65 期号:24
英文摘要	The rapid diversification of early animals during the Ediacaran (635–541 Ma) and early Cambrian (ca. 541–509 Ma) has frequently been attributed to increasing oceanic oxygenation. However, the pattern of oceanic oxygenation and its relationship to early animal evolution remain in debate. In this review, we examine the redox structure of Ediacaran and early Cambrian oceans and its controls, offering new insights into contemporaneous oceanic oxygenation patterns and their role in the coevolution of environments and early animals. We review the development of marine redox models which, in combination with independent distal deep-ocean redox proxies, supports a highly redox-stratified shelf and an anoxia-dominated deep ocean during the Ediacaran and early Cambrian. Geochemical and modeling evidence indicates that the marine redox structure was likely controlled by low atmospheric O2 levels and low seawater vertical mixing rates on shelves at that time. Furthermore, theoretical analysis and increasing geochemical evidence, particularly from South China, show that limited sulfate availability was a primary control on the attenuation of mid-depth euxinia offshore, in contrast to the existing paradigm invoking decreased organic carbon fluxes distally. In light of our review, we infer that if oceanic oxygenation indeed triggered the rise of early animals, it must have done so through a shelf oxygenation which was probably driven by elevated oxidant availability. Our review calls for further studies on Ediacaran-Cambrian marine redox structure and its controls, particularly from regions outside of South China, in order to better understand the coevolutionary relationship between oceanic redox and early animals. © 2020 Science China Press
关键词	Cambrian Explosion Early animal Euxinia Oceanic oxygenation Redox stratification
英文关键词	Animals; Geochemistry; Oceanography; Offshore oil well production; Organic carbon; Oxygenation; Sulfur compounds; Animal evolution; Co-evolutionary; Early cambrians; Ediacaran cambrians; Geochemical evidence; Organic carbon fluxes; Primary control; Vertical mixing; Atmospheric structure
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207089
作者单位	State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China; Yunnan Key Laboratory for Palaeobiology, Yunnan University, Kunming, 650091, China; State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Wuhan, 430074, China; Department of Geology, University of Cincinnati, Cincinnati, OH45221, United States
推荐引用方式 GB/T 7714	Li C.,Shi W.,Cheng M.,et al. The redox structure of Ediacaran and early Cambrian oceans and its controls[J],2020,65(24).
APA	Li C.,Shi W.,Cheng M.,Jin C.,&Algeo T.J..(2020).The redox structure of Ediacaran and early Cambrian oceans and its controls.Science Bulletin,65(24).
MLA	Li C.,et al."The redox structure of Ediacaran and early Cambrian oceans and its controls".Science Bulletin 65.24(2020).