干旱区生态环境知识资源中心(Arid): Predominantly Ferruginous Conditions in South China during the Marinoan Glaciation: Insight from REE Geochemistry of the Syn-glacial Dolostone from the Nantuo Formation in Guizhou Province, China

Arid

DOI	10.3390/min9060348
	Predominantly Ferruginous Conditions in South China during the Marinoan Glaciation: Insight from REE Geochemistry of the Syn-glacial Dolostone from the Nantuo Formation in Guizhou Province, China
	Gu, Shangyi 1; Fu, Yong 1; Long, Jianxi 2
通讯作者	Gu, Shangyi
来源期刊	MINERALS
ISSN	2075-163X
出版年	2019
卷号	9 期号:6
英文摘要	The Neoproterozoic Era witnessed two low-latitude glaciations, which exerted a fundamental influence on ocean-atmosphere redox conditions and biogeochemical cycling. Climate models and palaeobiological evidence support the belief that open waters provided oases for life that survived snowball Earth glaciations, yet independent geochemical evidence for marine redox conditions during the Marinoan glaciation remains scarce owing to the apparent lack of primary marine precipitates. In this study, we explore variability in rare earth elements (REEs) and trace metal concentrations in dolostone samples of the Cryogenian Nantuo Formation taken from a drill core in South China. Petrological evidence suggests that the dolostone in the Nantuo Formation was formed in near-shore waters. All the examined dolostone samples featured significant enrichment of manganese (345-10,890 ppm, average 3488 ppm) and middle rare earth elements (MREEs) (Bell Shape Index: 1.43-2.16, average 1.76) after being normalized to Post-Archean Australian Shale (PAAS). Most dolostone samples showed slight to no negative Ce anomalies (Ce/Ce 0.53-1.30, average 0.95), as well as positive Eu anomalies (Eu/Eu 1.77-3.28, average 1.95). This finding suggests that the dolostone samples were deposited from suboxic to iron-enriched and anoxic waters. Although total REE concentrations correlated positively with Th concentrations in dolostone samples, MREE-enriched PAAS-normalized patterns preclude the conclusion that REEs were largely introduced by terrestrial contamination. Rather, we interpret the correlation between REEs and Th as an indication that the former were transported by colloids and nanoparticles in meltwaters. Taken together, we propose that anoxic and ferruginous water columns dominated in South China during the Marinoan glaciation with a thin oxic/suboxic layer restricted to coastal waters. The extreme anoxic and ferruginous conditions prevailing in the Cryogenian would have provided a baseline for subsequent transient Ediacaran ocean oxygenation and life evolution.
英文关键词	Nantuo Formation syn-glacial dolostone rare earth elements ferruginous conditions South China
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000473809300021
WOS关键词	RARE-EARTH-ELEMENTS ; NEOPROTEROZOIC DOUSHANTUO FORMATION ; TRACE-ELEMENT ; MICROBIAL CARBONATE ; ROCK INTERACTION ; OCEAN CHEMISTRY ; RIVERS ; IRON ; CONSTRAINTS ; DIAGENESIS
WOS类目	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217625
作者单位	1.Guizhou Univ, Coll Resource & Environm Engn, Guiyang 550025, Guizhou, Peoples R China; 2.Guizhou Geol Survey, Bur Geol & Mineral Explorat & Dev Guizhou Prov, Guiyang 550081, Guizhou, Peoples R China
推荐引用方式 GB/T 7714	Gu, Shangyi,Fu, Yong,Long, Jianxi. Predominantly Ferruginous Conditions in South China during the Marinoan Glaciation: Insight from REE Geochemistry of the Syn-glacial Dolostone from the Nantuo Formation in Guizhou Province, China[J],2019,9(6).
APA	Gu, Shangyi,Fu, Yong,&Long, Jianxi.(2019).Predominantly Ferruginous Conditions in South China during the Marinoan Glaciation: Insight from REE Geochemistry of the Syn-glacial Dolostone from the Nantuo Formation in Guizhou Province, China.MINERALS,9(6).
MLA	Gu, Shangyi,et al."Predominantly Ferruginous Conditions in South China during the Marinoan Glaciation: Insight from REE Geochemistry of the Syn-glacial Dolostone from the Nantuo Formation in Guizhou Province, China".MINERALS 9.6(2019).