Discussion on the interrelationship among Cu-Ni sulfide deposits,mafic volcanic rocks and intrusive rocks in the Sipu region,northern Guangxi,China  

作　　者：YANG Zhenjun ZHANG Wenshan LIU Jishun YIN Lijun 

机构地区：[1]Beijing Institute of Geology and Mineral Resources,Beijing 100012,China [2]China Nonferrous Metals Mineral Resources Geological Survey Center,Donia Resources Co.,Ltd.,Beijing 100012,China [3]School of Geoscience and Environmental Engineering,Central South University,Changsha 410083,China

出　　处：《Chinese Journal Of Geochemistry》2012年第3期282-296,共15页中国地球化学学报

摘　　要：The Sipu region of North Guangxi is located in the southwest of the "Jiangnan Ancient Land",where there are developed the oldest stratum in southern China,the Proterozoic Sipu Group,and there are also largely ex-posed mafic intrusive rocks,mafic volcanic rocks and copper-nickel sulfide deposits.Both mafic intrusive rocks and volcanic rocks are rich in MgO(6.52%-26.39%),but poor in K2O(0.05%-1.00%) and TiO2(0.33%-0.89%).They are also rich in trace elements such as Rb and Ba while poor in Ta,Nb and the like.Both of them have medium con-tents of rare-earth elements,30.26×10-6-126.71×10-6,in which LREEs are slightly rich with ΣLREE/ΣHREE of 1.35-2.46,δEu 0.79-1.33,displaying weak or no δEu anomaly,with the same geochemical features.The right-inclined distribution patterns and the features show that magma would be formed at the comagmatic un-diagenetic stage.All studies show that mafic intrusive rocks and volcanic rocks are the products of the same source region evolving in different stages and times.The copper-nickel sulfide deposits are characterized by liquation,crys-tallization and fractionation of mafic rocks,and have some interrelations with mafic intrusive rocks and volcanic rocks with respect to magmatic genesis.The Sipu region of North Guangxi is located in the southwest of the ＂Jiangnan Ancient Land＂,where there are developed the oldest stratum in southern China,the Proterozoic Sipu Group,and there are also largely ex-posed mafic intrusive rocks,mafic volcanic rocks and copper-nickel sulfide deposits.Both mafic intrusive rocks and volcanic rocks are rich in MgO（6.52%-26.39%）,but poor in K2O（0.05%-1.00%） and TiO2（0.33%-0.89%）.They are also rich in trace elements such as Rb and Ba while poor in Ta,Nb and the like.Both of them have medium con-tents of rare-earth elements,30.26×10-6-126.71×10-6,in which LREEs are slightly rich with ΣLREE/ΣHREE of 1.35-2.46,δEu 0.79-1.33,displaying weak or no δEu anomaly,with the same geochemical features.The right-inclined distribution patterns and the features show that magma would be formed at the comagmatic un-diagenetic stage.All studies show that mafic intrusive rocks and volcanic rocks are the products of the same source region evolving in different stages and times.The copper-nickel sulfide deposits are characterized by liquation,crys-tallization and fractionation of mafic rocks,and have some interrelations with mafic intrusive rocks and volcanic rocks with respect to magmatic genesis.

关 键 词：铜镍硫化物矿床 基性火山岩 基性侵入岩 中国南方 西北部 地球化学特征 同源岩浆 江南古陆 

分 类 号：P618.41[天文地球—矿床学] P588.14[天文地球—地质学]