Geochemistry of the trace elements and rare-earth elements at the boundary between Cambrian Series 2 and Series 3 at Jianshan,South China:Paleoenvironmental and stratigraphic implications

作     者：YANG Xinglian ZHAO Yuanlong GUO Qingjun YANG Hong YANG Xinglian;ZHAO Yuanlong;GUO Qingjun;YANG Hong

作者机构：College of Resource and EnvironmentGuizhou UniversityGuiyang 550003China State Key Laboratory of Palaeobiology and StratigraphyNanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China Center of Environmental RemediationInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China 

出 版 物：《Chinese Journal Of Geochemistry》 (中国地球化学学报)

年 卷 期：2012年第31卷第4期

页      面：465-475页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 09[农学] 0902[农学-园艺学] 090202[农学-蔬菜学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 40902003,40972023,41173008) Guizhou Natural Science Foundation (Grant No. Gui Ji. 2011-2035) International Cooperation Foundation of Science and Technology Department of Guizhou Province (Grant No. Gui G. 2010-7001) State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology,CAS) (No. 113109) Hundred Talents Program of the Chinese Academy of Sciences 

主　　题：稀土元素地球化学特征 微量元素组成 寒武系 电感耦合等离子体质谱法 边界 古环境 剖面显示 地层 

摘      要：The Jianshan section in Jianhe County,Guizhou Province,is a very important auxiliary section to the candidate stratotype at the boundary between Cambrian Series 2 and Series *** four samples collected from the Jianshan section of the Kaili Formation were analyzed for the concentrations of trace element and rare-earth elements(REEs) by inductively coupled plasma mass *** trace element and REE geochemical characteristics of the Kaili Formation at the Jianshan section show that trace element composition and REE distribution patterns across the section are ***,at 44 m above the base of the Kaili Formation,most trace element contents and REEs concentrations are lower than those values observed below 44 *** 44 m,an increasing trend in the concentration of both trace elements and REEs is *** geochemical data indicate important,but subtle,changes at the 44 m *** this is,in fact,verified by work in progress,geochemical criteria can provide additional supports for defining the top surface of Cambrian Series 2,especially in sections where Oryctocephalus indicus is *** element ratios,specifically Ni/Co,V/Cr,V/(Ni+V) and Th/U as well as Ce and Eu anomalies indicate that the sedimentary environment of the Kaili Formation at the Jianshan section was oxidizing,that benthic redox conditions were less oxic,and may have been influenced by freshwater as compared to the Balang ***,the Eu anomalies observed in the Kaili Formation are similar to the negative Eu anomalies observed in post-Archean sedimentary rocks,and reveal fluctuations in oxygen content from the bottom to the top of the Kaili Formation.