气候变化领域集成服务门户(CCPortal): Suboxic-dominated conditions in the Ediacaran shallow ocean: Geochemistry of pelitic siltstones in the Doushantuo Formation; South China

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DOI	10.1016/j.palaeo.2020.109658
	Suboxic-dominated conditions in the Ediacaran shallow ocean: Geochemistry of pelitic siltstones in the Doushantuo Formation; South China
	Chen Y.; Huang J.; Zhong Y.; Zhang X.; Zhai M.; Chu X.
发表日期	2020
ISSN	0031-0182
卷号	546
英文摘要	The Ediacaran witnessed a significant oxygenation of the Earth's surface in line with the emergence and diversification of early animals, but the redox conditions of the shallow waters during this period are still uncertain. Here, we present geochemical profiles from neritic pelitic siltstones of the Doushantuo Formation at the village of Xiaoyang on the northwestern margin of the Yangtze Platform in South China. Most sediments show moderate to low FeHR/FeT ratios (≤0.38), low FePy/FeHR ratios (<0.7), and low enrichment factors (EF ≤ 1) for most redox-sensitive elements, suggesting predominately oxygenated shallow waters. However, we also find moderately enriched Re (EF ~10–25) combined with depleted U and Mo (EF ≤ 1), indicating suboxic conditions. Furthermore, a few samples show FeHR/FeT > 0.38, suggesting episodic anoxia in the shallow ocean. Overall, the Xiaoyang section represents a suboxic shallow ocean with occasional episodes of anoxia during the Doushantuo stage, implying that the oxygenation level in the early-mid Ediacaran ocean was still limited, even under some shallow conditions. It also supports the high redox heterogeneity in the early-mid Ediacaran ocean, which could have restricted the evolution and distribution of early metazoans. © 2020 Elsevier B.V.
英文关键词	Fe speciation; Neritic facies; Sulfur isotope; Trace elements; Yangtze Platform
语种	英语
scopus关键词	Ediacaran; geochemical survey; geochemistry; redox conditions; siltstone; speciation (chemistry); suboxic conditions; sulfur isotope; trace element; China; Yangtze Platform; Animalia; Metazoa
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/150542
作者单位	Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin, 300191, China; Center of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao, 266071, China; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China; CAS Center for Excellence in Comparative Planetology, Hefei, 230026, China; Tianjin Center, China Geological Survey, Tianjin, 300170, China; State Key Laboratory of Continental Dynamics and Shaanxi Key Laboratory of Early Life and Environment, Department of Geology, Northwest University, Xi'an, 710069, China; Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Chen Y.,Huang J.,Zhong Y.,et al. Suboxic-dominated conditions in the Ediacaran shallow ocean: Geochemistry of pelitic siltstones in the Doushantuo Formation; South China[J],2020,546.
APA	Chen Y.,Huang J.,Zhong Y.,Zhang X.,Zhai M.,&Chu X..(2020).Suboxic-dominated conditions in the Ediacaran shallow ocean: Geochemistry of pelitic siltstones in the Doushantuo Formation; South China.Palaeogeography, Palaeoclimatology, Palaeoecology,546.
MLA	Chen Y.,et al."Suboxic-dominated conditions in the Ediacaran shallow ocean: Geochemistry of pelitic siltstones in the Doushantuo Formation; South China".Palaeogeography, Palaeoclimatology, Palaeoecology 546(2020).