滇西马厂箐岩体同位素地球化学特征及意义  

Isotope geochemical characteristics of Machangqing rock mass in western Yunnan and its implications

作　　者：李莉[1,2] 郭晓东[2] 

机构地区：[1]地质出版社,北京100083 [2]武警黄金地质研究所,河北廊坊065000

出　　处：《矿产与地质》2013年第1期56-64,共9页Mineral Resources and Geology

基　　金：国家"973"计划项目(2009CB421000);武警黄金指挥部专项基金项目(HJ09-03)

摘　　要：马厂箐铜-钼-金多金属矿床就是"三江"构造带最著名的斑岩型矿床之一。文章对其S,H,O,Pb,C,He,Ar,Rb,Sr同位素进行了系统研究,分析总结了同位素组成特征、演化规律,结合野外地质研究,推知马厂箐岩体起源于深部的富集地幔,在地幔物质上侵的过程中,有地壳物质的混入。其铜钼矿化成矿流体和物质来自于岩浆;接触带附近的角岩型和矽卡岩型铜钼(金)矿化成矿流体和物质来自于岩浆和围岩地层,以岩浆为主;围岩地层中的石英脉型和破碎蚀变岩型金矿化成矿流体和物质来源于岩浆和围岩地层,岩浆的成分减少。从而确定了同位素地球化学研究在马厂菁箐铜-钼-金矿床成矿作用及矿床成因研究中的重要地位。Machangqing Cu-Mo-Au polymetallic deposit is one of the most notable porphyry deposits in ＂San- jiang＂ tectonic zone. Systematic research on isotopes such as S, H, O, Pb, C, He, At, Rb and Sr, and analysis on composition characteristics and evolution law of the isotopes, and the field geological research were conducted. Machangqing rock mass, which originates from enriched mantle at depth, are mixed with crustal materials during the upward penetration of mantle materials. Ore-forming fluid and materials of Cu- Mo mineralization originate from magma; ore-forming fluid and materials of hornfels-type and skarn-type Cu-Mo （Au） mineralization near the contact zone originate from magma and wall rock, and they are mainly magma; ore-forming fluid and materials of quartz vein type and fractured altered rock type Au mineralization in wall rock originate from magma and strata, and ratio of magma in the composition is decreasing. Hence isotope geochemical research is significant to the study of mineralization and genesis of Machangqing Cu-Mo- Au deposit.

关 键 词：同位素地球化学 成矿作用 马厂箐岩体 滇西 

分 类 号：P597.2[天文地球—地球化学] P595[天文地球—地质学]