新疆东天山天宇铜镍硫化物矿床Re-Os同位素物质来源示踪研究  

Re-Os isotopic analysis of the Tianyu Cu-Ni sulfide deposit of Esat Tianshan,Xinjiang

作　　者：王亚春[1] 张弘刚[1] 许家玲 杨长江[1] 

机构地区：[1]吉林省第一地质调查所,吉林长春130033 [2]吉林省第四地质调查所,吉林通化134001

出　　处：《吉林地质》2013年第1期51-58,共8页Jilin Geology

基　　金：国家自然科学基金项目(编号:40973036);国家科技支撑计划项目(编号:2011BAB06B04-1)联合资助

摘　　要：通过对天宇铜镍硫化物矿石中的硫化物Re-Os同位素物质来源示踪研究,其187Os/188Os初始比值为0.864 9～2.910 6,γOs位于592～884之间,γOs平均值为832.5,说明在成矿过程中仅有大量地壳物质混染加入到岩浆和成矿系统之中;根据天宇岩体的岩石地球化学特征,并结合东天山东段基性一超基性岩体的空间分布特征,认为该岩体形成于洋内俯冲的增生岛弧环境,是晚古生代北天山洋壳向南俯冲增生的产物。Re and Os concentrations as well as Os and S isotopic analyses were obtained for sulfides in sulfide ores from the Tianyu Cu-Ni deposit,with the purpose of assessing the role of crustal contamination in the formation of the Tianyu Cu-Ni deposit.The initial 187 Os/188 Os ratios are from 0.8649 to 2.9106,the γOs values are from 592 to 884,whose average value is 832.5.These show that in the metallogenic process only large crustal materials into the magma and mineralization system.According to the rock geochemical features of Tianyu rock mass,combining space distribution features of basic-ultrabasic rock of East Tianshan eastern section,the rock formed in overgrowth island arc environment of Intra-oceanic subduction,and it is a product of North Tianshan ocean crust subduction overgrowth southward of the Late Paleozoic.

关 键 词：RE-OS同位素 铜镍硫化物矿床 天宇 东天山 

分 类 号：P597[天文地球—地球化学]