西藏冈底斯铜矿带甲马夕卡岩型铜多金属矿床与驱龙斑岩型铜矿流体包裹体特征对比研究  

Study on the fluid inclusions from Jiama skarn copper polymetallic deposit and Qulong porphyry copper deposit in Gandese copper belt,Tibet.

作　　者：佘宏全[1] 丰成友[1] 张德全[1] 李光明[2] 刘波[2] 李进文[1] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质调查局成都地质矿产研究所,成都610082

出　　处：《岩石学报》2006年第3期689-696,共8页Acta Petrologica Sinica

基　　金：国家973项目(2002CB412609)资助的研究成果。

摘　　要：对甲马铜多金属矿床流体包裹体研究表明与成矿有关的流体包裹体主要有富液相、富气相和含子矿物多相包裹体三类,包裹体的均一温度范围变化大,从240℃到＞500℃。矿床形成早期干夕卡岩阶段,矿物形成温度大于500℃,湿夕卡岩阶段均一温度区间集中在270℃～360℃之间,该时期为硫化物矿物形成的主要沉淀阶段。矿床的矿物组合、包裹体类型及包裹体激光拉曼探针分析表明成矿流体以高盐度、富含Na、K、Ca、Si、Cl^-、SO_4^(2-)、CO_3^(2-)等成分为特点,流体来源以岩浆作用为主。甲马矿床属与岩浆作用有关的典型夕卡岩型多金属矿床。根据甲马矿床与附近驱龙斑岩铜矿流体包裹体和同位素特征对比分析,提出二者应属于同一成矿系列。The dominant fluid inclusions in Jiama skarn ore deposit related to metallogensis include liquid-rich, gas-rich two-phase and daughter-minerals bearing polyphase types, homogenization temperature of the fluid inclusions ranges from 240℃ to 〉 500℃. The formation of ore deposit has undergone multistage mineralization, the temperature of the garnet formed at early anhydrous stage is above 500 ℃, the hydrous skarn stage is the main stage for the precipitation of sulfides minerals, its formation temperature is within the range of mesothermal （270℃ to 360℃）. The study of mineralogy aggregation, features of different types of fluid inclusions and the analytic results get by Laser Laman Spectroscopy, indicated that the ore-forming fluids is of high-salinity and riched in the constituents of Na, K, Ca, Si, Cl^-, SO4^2-, CO3^2-. Jiama copper polymetallic deposit is a typical high-temperature canbonate-hosted skarn deposit. Comparing the fluid inclusions and stable isotopes of Jiama skarn deposit with that of Qulong porphyry copper deposit near Jiama has shown that the two ore deposits belong to the same metallogenetic series.

关 键 词：西藏 冈底斯 甲马夕卡岩型矿床 驱龙斑岩铜矿 铜铅锌多金属矿 流体包裹体 成矿作用 

分 类 号：P588.132[天文地球—岩石学] P618.4[天文地球—地质学]