西藏南木斑岩铜钼矿床的流体包裹体研究  

Study of the fluid inclusions from Nanmu porphyry Cu-Mo deposit in Tibet.

作　　者：张绮玲[1] 曲晓明[1] 徐文艺[1] 侯增谦[1] 陈伟十[1] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037

出　　处：《岩石学报》2003年第2期251-259,共9页Acta Petrologica Sinica

基　　金：中国地质调查局地质调查项目(编号:DKD2002003)的部分成果

摘　　要：南木斑岩铜钼矿床是西藏冈底斯东段铜多金属成矿带中的典型斑岩矿床。流体包裹体研究显示与成矿有关的包裹体可以分为液相包裹体、气相包裹体和含子晶多相包裹体三类,它们的均一温度为315～526℃,盐度变化大,含石盐子矿物包裹体的盐度w(NaCl_(eq))33.1％～52.98％。激光拉曼探针成分分析表明,黄铜矿等子矿物相存在于高盐度包裹体中,部分液相包裹体和气相包裹体含有一定量的CO_2。含子矿物包裹体与液相包裹体、气相包裹体共存,且均一温度相近,盐度相差很大,表明成矿流体经历了沸腾作用。成矿流体是富含成矿金属元素的高盐度、高温岩浆流体,岩浆热液提供了主要金属物质。The Nanmu porphyry Cu-Mo deposit is a typical porphyry deposit discovered in the east Gangdeise polymetallic metallogenic belt of Tibet. Three types of fluid inclusions, namely liquid, gas-rich and the daughter mineral bearing inclusions have been found. The temperature of homogenization of the fluid inclusions ranges from 315degreesC to 526degreesC. The salinities of three types of inclusions varies remarkable and with high salinity from 33. 1wt% similar to 52. 98wt% NaCl equivalent in NaCl daughter mineral bearing ones. Chalcopyrite, as a daughter mineral, has been found in high salinity inclusions and CO2 have been detected in the liquid and gas inclusions by Laser Raman Spectroscopy. Boiling, which is provided by the coexisting liquid, gas-rich and the daughter mineral bearing inclusions and their similar homogenization temperatures, is an important factor during the mineralization. The evidences from this study demonstrate that the ore-forming fluid of Nanmu porphyry Cu (Mo) deposit are a high salinities, high temperature ore-bearing magmatic fluid.

关 键 词：斑岩铜(钼)矿 流体包裹体 岩浆流体 南木 西藏 

分 类 号：P611.134[天文地球—矿床学] P618.41[天文地球—地质学]