DOI: 10.1016/j.scib.2020.09.023
论文题名: The redox structure of Ediacaran and early Cambrian oceans and its controls
作者: Li C. ; Shi W. ; Cheng M. ; Jin C. ; Algeo T.J.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 24 起始页码: 2141
结束页码: 2149
语种: 英语
中文关键词: 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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169945
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Li C.,Shi W.,Cheng M.,et al. The redox structure of Ediacaran and early Cambrian oceans and its controls[J]. Science Bulletin,2020-01-01,65(24)