Dynamic evolution of the Ediacaran ocean across the Doushantuo Formation, South China

	Dynamic evolution of the Ediacaran ocean across the Doushantuo Formation, South China
	Tao Han; Haifeng Fan
	2015
发表期刊	Chemical Geology
卷号	417 期号:1 页码:261-272
摘要	Oceanic redox conditions and atmospheric oxygenation likely played a crucial role in the evolution of macroscopic multicellular eukaryotes during the early Ediacaran period. However, the oxidation mechanism and magnitude of the Ediacaran ocean-atmosphere system remain controversial. To constrain the oceanic redox conditions and the contemporaneous oxygenation of the atmosphere, we present a comprehensive investigation of redox-sensitive elements (e.g., Mo and U), Fe speciation and S isotopes of pyrite from the platform, slope and basin sections across the Doushantuo Formation in South China. Our results suggest a redox-stratified Ediacaran ocean with a fluctuating chemocline from the slope to platform location across the Doushantuo Formation. In particular, euxinic/intermittently euxinic conditions developed not only at the platform and slope but also in the deep basin. Furthermore, these euxinic conditions indicate that high sulfate concentrations may have accumulated not only at the ending of the Ediacaran Doushantuo Formation but also at the middle and beginning. Thus, these results suggest that the extensive euxinic conditions associated with the continuous oceanic sulfate input were in response to progressive oxygenation of the atmosphere during the early Ediacaran period. Integrated with previously published results, if the dissolved organic carbon (DOC) reservoir existed, different mechanisms may be responsible for the oxidation of deep ocean in each part of the studied sections across the Doushantuo Formation. One mechanism is oxidation by sulfate through a bacterial sulfate reduction (BSR) process under anoxic conditions. Another mechanism is oxidation by dissolved free oxygen under oxic/suboxic conditions. Finally, a dynamic evolution model of the Ediacaran ocean-atmosphere system across the Doushantuo Formation, South China, was suggested.
关键词	Redox-stratified Ocean Euxinic Condition Oxidation Mechanism Ediacaran Doushantuo Formation
学科领域	矿床地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5762
专题	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文矿床地球化学国家重点实验室
推荐引用方式 GB/T 7714	Tao Han,Haifeng Fan. Dynamic evolution of the Ediacaran ocean across the Doushantuo Formation, South China[J]. Chemical Geology,2015,417(1):261-272.
APA	Tao Han,&Haifeng Fan.(2015).Dynamic evolution of the Ediacaran ocean across the Doushantuo Formation, South China.Chemical Geology,417(1),261-272.
MLA	Tao Han,et al."Dynamic evolution of the Ediacaran ocean across the Doushantuo Formation, South China".Chemical Geology 417.1(2015):261-272.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Dynamic evolution of（2014KB）			开放获取	使用许可	浏览下载