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《Geochimica》 2011-01
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Reconstruction of the Early Cambrian carbonate sedimentary environment in Akesu area of Xinjiang,China:Evidences from trace elements and carbon isotope excursion

YAO Chun-yan1,MA Dong-sheng1,DING Hai-feng1 and ZHANG Xiao-yong2 1.State Key Laboratory for Mineral Deposits Research,Nanjing University,Nanjing 210093,China;2.Jiangsu Environment Monitoring Center,Nanjing 210036,China  
The concentrations of redox-sensitive elements Mo,V,Cd,U,and carbon and oxygen isotope data of marine carbonates from the Cambrian Terreneuvian,the upper Yuertusi Formation and the Cambrian Series 2 the lower Xiaoerbulake Formation in the Akesu area,northern of Tarim Basin(China) were investigated to understand bottom water redox conditions during the Early Cambrian.Two negative shifts of δ13C appear in the Xiaoerbulake Formation of the Youermeinake section with valley values of -2.1‰ and -2.4‰,respectively,associated with the enrichment of redox-sensitive elements Mo,V,Cd,and U.Through these analyses,we demonstrate that the δ13C negative shifts might indicate that the bio-productivity was decreasing due to the upwelling water.In the samples YR-3,YR-4,and YR-5,the contents of redox-sensitive elements reveal negative shift,connecting to Mn enrichment,which reflect the changes of the sedimentary conditions and the oxic surroundings.The contents of redox-sensitive elements Mo,V,Cd,and U are dramatically richer than average element contents from the sedimentary carbonates of the Earth Crust,with high V/Cr and V/Sc ratios in the samples YR-9,YR-10,YR-11,YR-12,and YR-13,and indicate an anoxic deposition environment.On the top of the You ermeinake section,lower concentrations of redox-sensitive elements,especially low V/Sc ratios,might imply near-oxic/suboxic conditions in the water column.A large amount of fossils were found in the Yuertusi Formation and Xiaoerbulake Formation.Those imply that the ocean was stratified during the Early Cambrian,which was oxic on the surface and suboxic-oxic with transitory anoxic event in the bottom water.The upwelling water might have resulted in changes in the sedimentary conditions.
【Fund】: 国家重点基础研究发展计划项目(2007CB411301)
【CateGory Index】: P618.13
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