Abstract：In this paper,geochemical characteristics of trace elements and rare earth elements of the Daye Formation in Yanlou-Huaxi, Guiyang were analyzed. The enrichment of redox sensitive elements(U,V,Mo)and ratios of U/Th,V/Th,Mo/Th are higher than those of PAAS. Some geochemical parameters of redox sensitive elements such as V/(V+Ni),V/Cr,Ni/Co,V/Sc and MoEF/UEF ratios indicate that the deposit of the Member 1 of the Daye Formation was formed in hypoxia-lean oxygen environment,while the Member 2 of the Daye Formation in the lean oxygen-oxidizing environment. Rare earth element partition type is relatively flat. Hypoxia-lean oxygen environment was instructed by the characteristic parameters of rare earth elements(δCe and Ce/La)in the Early Triassic. The δEu positive anomalies in the Member 1 of the Daye Formation suggest that affected by volcanic hydrothermal process significantly,and weaker influences of volcanism showed slightly positive anomaly in the Member 2 of the Daye Formation. The lean oxygen environment of the Early Triassic is interpreted to be associated with frequent volcanism. Based on analysis of the structure and way of life of bivalves,byssus sessile lifestyle was behaved by Claraia that belongs to lean-oxygen biology. Biological structures of bivalve fossils is divided into the prismatic shell and the complex interleaved laminated pearl layer,which is associated with hypoxia of the ocean environment.The the shallow water with weak hydrodynamic conditions should be the claraia major living environment.
Wang Shuang,Yang Rui-Dong. Analysis of geochemistry features and sedimentary environment of the Lower Triassic Daye Formation in Yanlou section of Huaxi, Guiyang[J]. JOPC, 2018, 20(2): 285-298.
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