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	REE and trace element patterns from organic-rich rocks of the Ediacaran-Cambrian transitional interval
	Guo Q. J.; Deng, Y. N.; Hippler, D.; Franz, G.; Zhang, J. M.
	2016
关键词	Ediacaran-Cambrian interval Trace elements and REE Two oxidation events The Yangtze Platform, South China rare-earth-elements mo-pge-au south china implications redox-sensitive metals 3 gorges area yangtze platform black shales precambrian/cambrian boundary niutitang formation guizhou province
英文摘要	It has been established that important changes in the marine environment and the biosphere occurred during the Cambrian. However, the relationships between the so-called "Cambrian Explosion" and the concomitant environmental changes are not yet fully understood. This study presents new geochemical data from the black shale successions from different facies belts of the Yangtze Platform in South China. Variations in the concentrations of REE and trace elements (varying Ce/Ce*, Th/U, V/Sc, and V/Cr ratios) in kerogen as well as in bulk rocks from different depositional environments along a transect from platform to basin indicate two oxidation events, which led to the oxygenation of the water column in shallow-marine environments and euxinic conditions (weak correlation between TOC, V, U, and Mo) in the deeper sea. During the first oxidation event in the late Terreneuvian, anoxic conditions in bottom waters rapidly changed to euxinic conditions. Subsequently, the second oxidation event during the early Epoch 2 of the Cambrian led to oxic suboxic conditions in deeper seawater. (C) 2016 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
出处	Gondwana Research
卷	36
页	94-106
语种	英语
ISSN号	1342-937X
DOI标识	10.1016/j.gr.2016.03.012
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/42961]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Guo Q. J.,Deng, Y. N.,Hippler, D.,et al. REE and trace element patterns from organic-rich rocks of the Ediacaran-Cambrian transitional interval. 2016.

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