Geochemistry and Geochronology of Diorite in Pengshan Area of Jiangxi Province:Implications for Magmatic Source and Tectonic Evolution of Jiangnan Orogenic Belt

查看全文 作　　者：Hongfeng [1]Shi;Junpeng [2]Wang;Yuan [3]Yao;Jing [1]Zhang;Song [4]Jin;Yingxin [1]Zhu;Kang [2]Jiang;Xiaolong [2]Tian;Deng [2]Xiao;Wenbin [2]Ning

机构地区：[1]Nanjing Geological Survey Center,China Geological Survey,TVaw/zwg 210016,China;[2]State Key Laboratory of Geological Processes and Mineral Resources,Hubei Key Laboratory of Critical Zone Evolution,Center for Global Tectonics,School of Earth Sciences,China University of Geosciences,Wuhan 430074,China;[3]Institute of Natural Resources and Environment Audit,Nanjing Audit University,Nanjing 211815,China;[4]Hebei Bureau of Geology and Mineral Resources Exploration,Shijiazhuang 050081,China

出　　处：《Journal of Earth Science》索引2020年第31卷第1期,共12页

基　　金：supported by the Fundamental Research Funds for the Central Universities,China University of Geosciences,Wuhan(CUGW)(Nos.CUGCJ1707 and CUGL180406);NNSFC fund(No.41602234);China Geological Survey’s projects(Nos.DD20160036 and DD20190261);Open Fund from the State Key Laboratory of Geological Processes and Mineral Resources,CUGW(No.GRMR201901) 摘　　要：Magmatic activities associated with tectonic events play a significant role in understanding the evolution of an orogenic belt.The Jiangnan orogenic belt has been regarded as the collisional suture zone between the Yangtze Block and the Cathaysia Block.Although the magmatic activities during the period of intra-plate extension after the collision have been well studied in recent years,some remaining issues,including source nature and geodynamic mechanism,need to be further addressed.In this paper,based on a detailed field geological,petrological,geochemical and geochronological study,we focus our work on diorites in the Pengshan area located at the northwestern margin of the Jiangnan orogenic belt.The mineral assemblages are mainly composed of plagioclase(55 vol.%-65 vol.%)and hornblende(35 vol.%-45 vol.%).One diorite sample yields zircon^(206)Pb/^(238)U mean age of 768±8 Ma(MSWD=0.29).The diorites have enriched large ion lithophile elements(Ba,K and Rb)and incompatible elements(Th and U),and are depleted in high field-strength elements including Ta,Ti and Nb.Diorites in this study have relatively high MgO content(6.56 wt.%-7.58 wt.%,7.07 wt.%on average)and Mg number values(65-67,65.8 on average).The diorites are metaluminous,high K calc-alkaline series rocks with high contents of K_2O(1.59 wt.%-1.97 wt.%)and total alkali(Na_2O+K_2O=5.56 wt.%-6.05 wt.%).The Nd/Th ratio(4.34-5.27)is higher than that of crust-derived rocks and lower than mantle-derived rocks.The Rb/Sr ratio(0.19-0.22)is slightly lower than crust,but significantly higher than upper mantle.Based on the above geochemical and geochronological analyses,we suggest that the diorites in the Pengshan area were mainly derived from crustal materials with a small amount of mantleoriginated materials involved,and possibly produced from an extensional tectonic setting after the collision between the Yangtze Block and Cathaysia Block. 关键词：NEOPROTEROZOIC DIORITE GEOCHEMISTRY Pengshan area Jiangnan orogenic belt

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Geochemistry and Geochronology of Diorite in Pengshan Area of Jiangxi Province:Implications for Magmatic Source and Tectonic Evolution of Jiangnan Orogenic Belt

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