黔中地区震旦系洋水组地球化学特征及其对古海洋环境的指示<sup>*</sup>

doi:10.7605/gdlxb.2021.03.034

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Abstract To reconstruct the palaeoceanographic environments during the Ediacaran Doushantuo period,this study focused on the phosphatic sequences of the Xiaohe(XH)and Xifeng(XF)phosphorite orefield to reveal the interaction between deposition of phosphorites and their sedimentary environments,by means of identification of rock and minerals,SEM,trace and rare earth elements analyses on phosphatic samples. Research results show that deposition of phosphorite was controlled by palaeo-morphology of shallow shoals around the Qianzhong Oldland. The ratio of Sr/Ba in phosphatic samples in Yangshui Formation is commonly larger than 1,and the average value is 1.90(XH)and 0.95(XF),respectively. The Sr/Ba ratio of samples in the Chenjiang Formation is less than 1 with average values of 0.11(XH)and 0.18(XF). The different results of the Sr/Ba ratio suggest transformation from lacustrine environments in the Chengjiang period to marine environments. The ratios of V/Cr and Ni/Co in phosphatic deposits in the Xiaohe Yansgshui Formation are 1.77 and 2.17,respectively,and 1.26 and 2.83 in the Xifeng section,collectively indicating suboxic to oxic environments. The values of δCe in the Xifeng phosphorites are limited between 0.75 and 0.95 with a mean value of 0.85,and those in the Xiaohe phosphorites are 0.74 to 1.09(mean value of 0.88). Increase of negative Ce anomalies from the bottom to the top of the Yangshui Formation shows that sedimentary environments transferred from suboxic to oxic. The change of paleo-ocean geochemical values suggests the increase of the ocean productivity in coastal environments,stimulating deposition of biological action induced phosphorite,and the life evolution also changed the oxygen content and distribution in ocean. Therefore,the transformation of phosphogenesis environments is a positive response to the Neoproterozoic Oxygenation Event and life evolution.

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	Articles by authors
	Wang Ze-Peng
	Wu Wen-Ming
	Liu Jian-Zhong
	Du Yuan-Sheng
	Zhang Ya-Guan
	Fu Yong
	Chen Guo-Yong
	Li Lei
	Tan Dai-Wei
	Wang Da-Fu
	Pan Qi-Quan
	Wang Xiao-Yong
	Huang Yi
	Wan Da-Xue

Key words： central Guizhou Province Doushantuoian phosphorite Yangshui Formation geochemistry ancient marine environment

Received: 11 July 2020

ZTFLH:

P588.24+4

Fund:National Natural Science Foundation of China(No.U1812405),the Second Batch of Integrated Exploration Projects of Guizhou Province and the Third Batch of National Integrated Exploration Projects of China Geological Survey(No.12120114016501)and(No.0747-1661SITCN131),the Geological Scientific Research Projects of Guizhou Geology and Mineral Exploration and Development Bureau(Guizhou Geology and Mineral Exploration Development[2016]No.10 and No.11)

Corresponding Authors: Du Yuan-Sheng,born in 1958,is a professor and Ph.D. supervisor of China University of Geosciences(Wuhan). He is mainly engaged in sedimentary geology and sedimentary minerals. E-mail: duyuansheng126@126.com.

About author: Wang Ze-Peng,born in 1983,obtained his Ph.D. degree from Institute of Geochemistry,Chinese Academy of Sciences in 2013. Now he is a senior engineer,and is mainly engaged in geochemistry. E-mail: wangzepengyu@126.com.

Cite this article:

Wang Ze-Peng,Wu Wen-Ming,Liu Jian-Zhong et al. Geochemical characteristics of the Sinian Yangshui Formation and their implications for palaeoceanographic environments in central Guizhou Province[J]. JOPC, 2021, 23(3): 610-624.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2021.03.034 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2021/V23/I3/610

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