Geochemical characteristics of the Sinian Yangshui Formation and their implications for palaeoceanographic environments in central Guizhou Province
Wang Ze-Peng1,5, Wu Wen-Ming1,5, Liu Jian-Zhong2,5, Du Yuan-Sheng3,5, Zhang Ya-Guan4,5, Fu Yong6, Chen Guo-Yong2, Li Lei1, Tan Dai-Wei1, Wang Da-Fu1, Pan Qi-Quan1, Wang Xiao-Yong1, Huang Yi1, Wan Da-Xue1
1 Geological Brigade 105,Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Guiyang 550018,China; 2 Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Guiyang 550004,China; 3 State Key Laboratory of Biogeology and Environmental Geology,School of Earth Sciences, China University of Geosciences(Wuhan),Wuhan 430074,China; 4 School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China; 5 Innovation Center of Ore Resources Exploration Technology in the Region of Bedrock, Ministry of Natural Resources of People’s Republic of China,Guiyang 550081,China; 6 College of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,China
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.
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.
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