Contrasting Mo-U enrichments of the basal Datangpo Formation in South China: Implications for the Cryogenian interglacial ocean redox

doi:10.1016/j.precamres.2018.07.013

IOCAS-IR > 海洋地质与环境重点实验室

	Contrasting Mo-U enrichments of the basal Datangpo Formation in South China: Implications for the Cryogenian interglacial ocean redox
	Ye, Yuntao 1,2,3; Wang, Huajian 3; Zhai, Lina 4; Wang, Xiaomei 3; Wu, Chaodong 1,2; Zhang, Shuichang 3
	2018-09-01
发表期刊	PRECAMBRIAN RESEARCH
ISSN	0301-9268
卷号	315 页码:66-74
通讯作者	Zhang, Shuichang(sczhang@petrochina.com.cn)
摘要	Paleoredox reconstructions of Neoproterozoic successions have been the subject of long-standing debates, especially concerning the precise timing of ocean ventilation and its causal relationship, if any, with the evolution of early animal life. Sponge biomarkers and putative sponge-like body fossils have been found from rocks in the Cryogenian Period, yet the contemporaneous deep-water conditions remain poorly understood. To fill this gap, we report pyrite morphology, trace metal enrichments, and total organic carbon data from interglacial black shales of the lower Datangpo Formation at Daotuo area, northeast Guizhou Province, South China. A contrasting Mo-U enrichments pattern emerges from the basal Datangpo black shales, despite the persistently euxinic local environment as testified by the presence of abundant tiny pyrite framboids. Molybdenum is markedly enriched in the basal interval and its concentration decreases sharply up section, while uranium stays relatively constant at crustal concentrations throughout the entire profile. This decoupled Mo-U signature, integrated with a simple mass balance model, suggests that euxinia only covered a small proportion of the dominantly ferruginous global seafloor, thus allowing dissolved Mo to accumulate to significant level in seawater. The enrichment degrees of Mo, although nontrivial, are still much lower than those from Phanerozoic equivalents. Contrarily, they are quite close to the total mean abundance for Mesoproterozoic euxinic shales. Such a mild increase of marine Mo-U inventory is therefore inferred as recording no dramatic rise in oxygen levels following the Sturtian glaciation. A drop of Mo contents after the basal interval could represent either limited Mo availability or inadequate hydrogen sulfide supply.
关键词	Cryogenian Datangpo Formation Pyrite framboid Trace elements Seafloor redox Nanhua Basin
DOI	10.1016/j.precamres.2018.07.013
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDA14010101] ; State Key Program of National Natural Science Foundation of China[41530317] ; National Science and Technology Major Project of the Ministry of Science and Technology of China[2016ZX05004-001] ; Scientific Research and Technological Development Project of China National Petroleum Corporation[CNPC 2016A-0204] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA14010101] ; State Key Program of National Natural Science Foundation of China[41530317] ; National Science and Technology Major Project of the Ministry of Science and Technology of China[2016ZX05004-001] ; Scientific Research and Technological Development Project of China National Petroleum Corporation[CNPC 2016A-0204]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000445165800004
出版者	ELSEVIER SCIENCE BV
引用统计	被引频次：32[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/337002/160178
专题	海洋地质与环境重点实验室
通讯作者	Zhang, Shuichang
作者单位	1.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Minist Educ, Beijing 100871, Peoples R China 2.Peking Univ, Inst Oil & Gas, Beijing 100871, Peoples R China 3.China Natl Petr Corp, Key Lab Petr Geochem, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China 4.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Ye, Yuntao,Wang, Huajian,Zhai, Lina,et al. Contrasting Mo-U enrichments of the basal Datangpo Formation in South China: Implications for the Cryogenian interglacial ocean redox[J]. PRECAMBRIAN RESEARCH,2018,315:66-74.
APA	Ye, Yuntao,Wang, Huajian,Zhai, Lina,Wang, Xiaomei,Wu, Chaodong,&Zhang, Shuichang.(2018).Contrasting Mo-U enrichments of the basal Datangpo Formation in South China: Implications for the Cryogenian interglacial ocean redox.PRECAMBRIAN RESEARCH,315,66-74.
MLA	Ye, Yuntao,et al."Contrasting Mo-U enrichments of the basal Datangpo Formation in South China: Implications for the Cryogenian interglacial ocean redox".PRECAMBRIAN RESEARCH 315(2018):66-74.

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