四川省拉拉铜矿床同位素地球化学特征及成矿意义  

Isotopic geochemistry of the Lala copper deposit,Sichuan Province,China and its metallogenetic significance

作　　者：孙燕[1] 舒晓兰[1] 肖渊甫[1] 

机构地区：[1]成都理工大学地球科学学院,四川成都610059

出　　处：《地球化学》2006年第5期553-559,共7页Geochimica

基　　金：国家计委科技找矿项目(JG9471904)

摘　　要：拉拉铜矿床位于康滇地轴西南缘,赋矿围岩是古元古界变质火山岩。通过矿床硫同位素、氢氧同位素、K-Ar同位素、铅同位素、Rb-Sr同位素及辉钼矿中Re-Os同位素的组成特点讨论了成矿时代、物质来源、成矿介质性质及矿床成因等问题。新元古代晋宁期发生的区域变质作用是促使矿床形成的主要成矿作用,古元古代形成的火山岩提供了大部分的成矿物质来源,成矿介质以变质水为主后期有大量地下水的加入。矿床为火山沉积-变质成因的层控型铜矿床。Lala copper deposit is located in the southwest margin of the Kangdian Axis in Sichuan Province with the Paleoproterozoic metamorphic volcanic rocks as its ore-bearing country rocks. The metallogenetic epoch, the sources of ore-forming materials, the property of ore-forming medium and the genesis of the copper deposit are discussed. Detailed studies on the compositional characteristics of S, H-O, K-Ar, Pb and Rb-Sr isotopes in the deposit, as well as Re-Os isotopes in molybdenite reveal that the major mineralization was resulted from the regional metamorphism occurred during Jinningian in Neoproterozoic, the volcanic rocks formed in the Paleoproterozoic provided most of the ore-forming materials, and the metamorphic solution was the main ore-forming medium with addition of a lot of underground water in the late metallogenetic stage. Systematic and synthetic researches of geology, ore deposit and isotopic geochemistry indicate that Lala copper deposit is characteristic of stratabound ore deposit with a genesis of volcanic sedimentation-metamorphism.

关 键 词：同位素地球化学 成矿作用 晋宁期 拉拉铜矿床 四川省 

分 类 号：P597[天文地球—地球化学] P611[天文地球—地质学]