Redox-sensitive elements of Ediacaran black shales in South China with implications for a widespread anoxic ocean

doi:10.1016/j.jseaes.2023.105670

	Redox-sensitive elements of Ediacaran black shales in South China with implications for a widespread anoxic ocean
	Hao, Yufei 1,2,3; Liu, He 1,2; Chen, Qian1,2,3 ; Sun, Weidong1,2,3 ; Huang, Jing 1,2
	2023-08-01
发表期刊	JOURNAL OF ASIAN EARTH SCIENCES
ISSN	1367-9120
卷号	251 页码:12
通讯作者	Huang, Jing(hjmail@qdio.ac.cn)
摘要	The high enrichment of redox-sensitive elements (RSEs), Mo, U, V, and Cr, in Ediacaran shales was attributed to the Neoproterozoic Oxygenation Event (NOE). However, recent studies have shown that contemporaneous shales from NW Canada do not exhibit RSE enrichment, whereas those from South China exhibit varying degrees of RSE enrichment. Here we investigate RSE records in a broader spatial and temporal distribution of shales within the Ediacaran Doushantuo Formation from South China. In general, RSEs in these shales do not display high en-richments, suggesting an extensively anoxic Ediacaran ocean with low RSE contents. There are also some outliers with high RSE enrichments of various depositional facies, which are closely tied to anoxic conditions. The abnormally high RSE enrichments in shales of the Doushantuo Formation were primarily related to the ocean environment, not due to secondary processes. We suggest that local RSE-enriched events intermittently occurred in the Nanhua Basin, possibly as a result of pulses of RSEs being transported from the surface ocean to the deep ocean. This would enhance the local RSE reservoirs, yielding high RSE enrichments in sediments. Our results suggest a widespread anoxic and RSE-depleted ocean in the Nanhua Basin during the early-middle Ediacaran Period. Contemporarily, RSE and sulfate reservoirs in the surface ocean were likely enhanced, supporting at-mospheric and oceanic oxidation. Moreover, the exchange of materials between the surface and deep sea was significantly strengthened, facilitating oceanic oxidation via the downward transportation of dissolved O2 from the surface.
关键词	Redox-sensitive element Doushantuo Formation Redox conditions Ediacaran South China
DOI	10.1016/j.jseaes.2023.105670
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[42173060] ; National Natural Science Foundation of China[42073011] ; National Natural Science Foundation of China[LSKJ202204100] ; Taishan Scholar Program of Shandong[ts201712075] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2020212]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000983408200001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS关键词	YANGTZE GORGES AREA ; DOUSHANTUO FORMATION ; SEDIMENTARY-ROCKS ; OXYGENATION ; GEOCHEMISTRY ; MOLYBDENUM ; RISE ; DISSOLUTION ; ACRITARCHS ; ENRICHMENT
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/183039
专题	深海极端环境与生命过程研究中心
通讯作者	Huang, Jing
作者单位	1.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 2.Deep Sea Multidisciplinary Res Ctr, Laoshan Lab, Qingdao 266237, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	深海极端环境与生命过程研究中心
通讯作者单位	深海极端环境与生命过程研究中心
推荐引用方式 GB/T 7714	Hao, Yufei,Liu, He,Chen, Qian,et al. Redox-sensitive elements of Ediacaran black shales in South China with implications for a widespread anoxic ocean[J]. JOURNAL OF ASIAN EARTH SCIENCES,2023,251:12.
APA	Hao, Yufei,Liu, He,Chen, Qian,Sun, Weidong,&Huang, Jing.(2023).Redox-sensitive elements of Ediacaran black shales in South China with implications for a widespread anoxic ocean.JOURNAL OF ASIAN EARTH SCIENCES,251,12.
MLA	Hao, Yufei,et al."Redox-sensitive elements of Ediacaran black shales in South China with implications for a widespread anoxic ocean".JOURNAL OF ASIAN EARTH SCIENCES 251(2023):12.