西藏冈底斯斑岩铜矿带驱龙铜矿成矿流体特征及其演化  

CHARACTERISTICS AND FORMING PROCESS OF ORE-FORMING FLUIDS AT QULONG COPPER DEPOSIT IN GANGDISE PORPHYRY COPPER BELT, TIBET

作　　者：杨志明[1] 谢玉玲[1] 李光明[2] 徐九华[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]国土资源部成都矿产地质研究所,成都610082

出　　处：《地质与勘探》2005年第2期21-26,共6页Geology and Exploration

基　　金：国家自然科学资金项目(编号: 40272047)资助。

摘　　要：驱龙铜矿是西藏冈底斯斑岩铜矿带东段典型的斑岩型铜矿床。流体包裹体研究显示,与成矿有关的包裹体主要分为液相包裹体、气相包裹体和含子矿物多相包裹体 3类,它们的均一温度为190℃~510℃;盐度为 0 5~52 5wt%NaCleq。激光拉曼显微探针 (LRM)分析表明,各类包裹体中气、液相成分以H2O为主。含子矿物多相包裹体与不同气相充填度的液相包裹体、气相包裹体共存,且均一温度相近,但盐度相差很大,表明成矿流体经历了沸腾作用。从蚀变矿物组合、流体包裹体显微测温分析及LRM分析可以看出,驱龙斑岩铜矿床成矿流体富含Cl-、SO2-4 、Na+、K+、Ca2+、CO2-3 ,具有较高盐度和较强的Cu溶解能力。The Qulong copper deposit is a typical porphyry copper deposit (PCD), and discovered in the east Gangdise porphyry copper ore belt of Tibet. Three types of fluid inclusions, namely liquid, gas-rich and daughter mineral-bearing inclusions, have been found. Fluid inclusions from this deposit have a salinity between 0.5 and 52.5 wt% NaCl eq, and homogenization temperatures range between 190 and 510℃. H_2O is dominated in the liquid and gas phases by laser Raman spectroscopy (LRM), at the same time minor CO^(2-)_3 has been detected too. Boiling, which is proved by the coexisting of liquid, gas-rich and the daughter mineral-bearing inclusions with similar homogenization temperatures, is an important factor during the mineralization. Ore-forming fluids of Qulong copper deposit is rich in Cl^-, SO^(2-)_4, Na^+, K^+ and CO^(2-)_3 with high salinity and strong solubility of copper, according to altered mineral assemblage and the analysis of Linkam THMS600 and LRM.

关 键 词：冈底斯 驱龙斑岩铜矿床 流体包襄体 流体演化 

分 类 号：P618.41[天文地球—矿床学]