Suboxic-dominated conditions in the Ediacaran shallow ocean: Geochemistry of pelitic siltstones in the Doushantuo Formation, South China

doi:10.1016/j.palaeo.2020.109658

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	Suboxic-dominated conditions in the Ediacaran shallow ocean: Geochemistry of pelitic siltstones in the Doushantuo Formation, South China
	Chen, Yali 3; Huang, Jing 4,5,6; Zhong, Yan 7; Zhang, Xingliang 1,8; Zhai, Mingguo 1,2,8,9; Chu, Xuelei 1,2,8,9
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2020-05-15
卷号	546 页码:10
关键词	Neritic facies Fe speciation Trace elements Sulfur isotope Yangtze Platform
ISSN号	0031-0182
DOI	10.1016/j.palaeo.2020.109658
通讯作者	Zhong, Yan(zhongy_tjc@163.com) ; Chu, Xuelei(xlchu@mail.iggcas.ac.cn)
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 Fe-HR/Fe-T ratios (<= 0.38), low Fe-py/Fe-HR 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 similar to 10-25) combined with depleted U and Mo (EF <= 1), indicating suboxic conditions. Furthermore, a few samples show Fe-HR/Fe-T > 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.
资助项目	Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18020102] ; Natural Science Foundation of China[41673002] ; Natural Science Foundation of China[41902197] ; Natural Science Foundation of China[41701355] ; National Key Research and Development Program of China[2017YFD0801003] ; Natural Science Foundation of Tianjin[17JCQNJC08100]
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000526826100007
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/167172]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Zhong, Yan; Chu, Xuelei
作者单位	1.Northwest Univ, Dept Geol, Shaanxi Key Lab Early Life & Environm, Xian 710069, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Minist Agr & Rural Affairs, Agroenvironm Protect Inst, Tianjin 300191, Peoples R China 4.Chinese Acad Sci, Inst Oceanog, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 6.Chinese Acad Sci, Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China 7.China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China 8.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 9.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Chen, Yali,Huang, Jing,Zhong, Yan,et al. Suboxic-dominated conditions in the Ediacaran shallow ocean: Geochemistry of pelitic siltstones in the Doushantuo Formation, South China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,546:10.
APA	Chen, Yali,Huang, Jing,Zhong, Yan,Zhang, Xingliang,Zhai, Mingguo,&Chu, Xuelei.(2020).Suboxic-dominated conditions in the Ediacaran shallow ocean: Geochemistry of pelitic siltstones in the Doushantuo Formation, South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,546,10.
MLA	Chen, Yali,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):10.