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《Acta Geologica Sinica》 2007-10
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Trace Element Geochemical Characteristics from the Ediacaran Cambrian Transition Interval in Eastern Guizhou,South China

YANG Xinglian1),ZHU Maoyan2),ZHAO Yuanlong1),ZHANG Junming2),GUO Qingjun3),LI Bingxia1)1)College of Resource and Environment of Guizhou University,Guiyang,5500032)State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing,2100083)State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550002  
Samples of black rock series collected from the Ediacaran-Cambrian transition interval in eastern Guizhou,South China,were analyzed for trace elements.There is a conspicuous accumulation of Ba,Pb,Ni,Cu,Zn,Li,V,U transitional elements and chalcophile elements in the polymetallic ore layer in the Nangao section,where,except for Sr,Li,and Cr,concentrations of all other elements are extremely high compared with those of the average shales.The elements such as Cu,Pb,Rb,Ti,Ni,V,Th,Li,Cr,Zr,Sc are accumulated at an equivalent level in the Sandu section.The silicastone in the Laobao Formation in the Nangao section formed in a slightly oxidized environment,as indicated by the fact that the δU and V/(Ni+V)values lie below the critical palaeoredox level.However,the δU and V/(Ni+V)values indicate an anoxic environment for the black shale of the Niutitang Formation.δU values in the Zhalagou section of Sandu range from 1.75 to 2,with an average value of 1.92,suggesting more strongly reducing conditions and a deeper water environment for this section than for the Nangao section at Danzhai.V/(Ni+V)values of silicastone in the Laobao Formation and the basal part of the Zhalagou Formation range from 0.8~0.99(average 0.95),which is higher than the critical value of 0.83,suggesting anoxic conditions.However,two brief oxic stages have been recorded in the Laobao Formation.The V/(Ni+V)values of the upper part of the Zhalagou Formation range from 0.59~0.94(average 0.71),indicating oxic conditions during these interval.All U/Th values of silicastone of the Laobao Formation in the Nangao section of Danzhai are smaller than 1,showing the geochemical feature of aqueous sediments.However,U/Th values of carbonaceous shale are larger than 1,demonstrating hydrothermal activities.The U/Th values of silicastone of the Laobao Formation and the black shale of the lower part of the Zhalagou Formation in the Zhalagou section of Sandu,are larger than 1 and vary from 6.55 to 343.85 with average of 49.41,indicating more frequent hydrothermal inputs in the area.Compared to average upper continental crust values,V and Ni show 9~10 times enrichment and U shows about 100 times enrichment in the Ni-Mo metal layer,and thus this horizon can also be used as a marker for defining the Meishucunian-Qiongzhusian boundary.
【Fund】: 国家自然科学基金项目(编号40162002);; 黔科合J字[2007]2151号项目;; 国家“973”项目(编号2006CB806401);; 中国科学院知识创新工程重要方向项目(编号KZCX3-SW-141);; 贵州大学博士启动基金项目资助成果
【CateGory Index】: P595
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