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《Geological Science and Technology Information》 2017-01
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Geochemistry of Black Shales During the Precambrian-Cambrian Transition in Yangtze Gorges Area and Its Implications for the Paleoenvironment

Hu Ya;Chen Xiaohong;China University of Geosciences(Beijing);Wuhan Center of China Geological Survey;  
Black shale units of Gunshiao section across the PC/C boundary in the Yangtze Gorges area had been quantitatively analysed for the rare earth and trace elements compositions,and characteristics of paleoceanographic evolution have been researched about this particular transitional period in this paper.In addition,the petrogenesis of siliceous rocks from Yanjiahe Formation was preliminarily discussed.The PAAS-normalized REE distribution patterns of black shales displayed LREE deficits,negative Ce anomalies and positive Eu anomalies in different degrees of the lithostratigraphic memberⅠ,ⅡandⅢ of Yanjiahe Formation.The Shuijingtuo Formation rocks showed weak LREE deficits,negligible Ce anomalies and slightly positive Eu anomalies.With reference to the PAAS,the whole black shale shamples exhibited significantly low total REE contents(ΣREE),including the silicalite layers which show much more lower contents than others and were possibly relevant to the dilution of the siliceous content.The enrichment factors(EF)of redox-sensitive elements and V/(V+Ni),U/Th values of the black shales displayed obvious evolutional trend during the transitional period.This may indicate that the early stage of Yanjiahe Formation(Late Ediacaran)was deposited in strongly stratified and anoxic(sulfidic)water-column conditions.Afterwards,the reduction degree and stratification status of water-column was getting gradually weaker when it came to Nemakit-Daldynian stage of Early Cambrian.At the early stage of Shuijingtuo Formation sedimentation(Early Tommotian stage of Early Cambrian),extensive transgression made the seawater back to the not very strong layered,anoxic and perhaps even sulfurated environment.Till Late Tommotian to Atdabanian stage of Early Cambrian,the oxygen content of the water-column gradually increased,transitioning to weak reduction-weak oxidation or suboxic state,which implies the instable physico-chemical characteristics of ancient seawater in this particular period.The bulk rocks negative Ce anomalies of Yanjiahe Formation are possibly relevant to the manifest effects of water-stratification and redox interface fluctuations on regional enviroment change.Whereas the bulk rocks Ce anomalies of Shuijingtuo Formation rose rapidly to unconspicuous from formerly negative environment,which might be associated with the positive feedback effects on Ce anomalies of fine-grained sediments of Shuijingtuo Formation played by the detrital materials in the region during this period.Geochemical features of siliceous rocks from Yanjiahe Formation near the PC/C boundary in the Yangtze Gorges area revealed that they originated in hydrothermal fluids.
【Fund】: 中国地质调查局项目(12120114053801)
【CateGory Index】: P588.2
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