西藏冈底斯成矿带达布矿区色日普金矿流体包裹体研究  

Fluid Inclusion of the Seripu Gold Deposit in Dabu of Gangdise,Tibet

作　　者：钟婉婷[1] 李应栩[1] 李光明[1] 张林奎[1] 李玉彬 董随亮[1] 张晖[1] 

机构地区：[1]中国地质调查局、成都地质调查中心,成都610081 [2]西藏自治区地质矿产勘查开发局、第五地质大队,青海格尔木816000

出　　处：《地质学报》2015年第3期599-607,共9页Acta Geologica Sinica

基　　金：由国家重点基础研究发展计划项目(973计划)《青藏高原南部矿床勘查模型与定位预测技术》(编号:2011CB403105);中国地质调查局地质调查项目《西藏铜铅锌国家级接替基地综合研究》(编号:1212010918033)项目;西藏扎西康铅锌多金属矿整装勘查区专项填图与技术应用示范(编号:12120114050701)联合资助

摘　　要：色日普金矿位于西藏冈底斯成矿带中段达布斑岩铜钼矿床外围。本文对该矿床矿体中赋存于含矿石英脉中的流体包裹体进行了岩相学、显微测温、激光拉曼探针以及氢氧同位素分析。研究表明:与成矿有关的流体包裹体可以分为3个大类和5个亚类;流体包裹体均一温度变化范围为117~377℃,流体盐度范围为2.57%~45.59%NaCleqv,成矿流体早期为高温、高盐度的H2O-NaCl-CO2体系,成矿期为中高温、中盐度H2O-NaCl-CO2体系,成矿晚期为中低温H2O-NaCl体系;成矿期流体包裹体气相成分除CO2外,还含少量CH4、N2等。据测温结果估算的成矿压力为120~130 MPa。通过对该矿区石英和硅化脉石英流体包裹体研究得出成矿流体主要来源于大气降水和具有显著岩浆贡献的携带金属成矿物质的热液混合的产物。The Seripu gold deposit is located in the middle Gangdise metallogenic belt and,belongs to the scope of Dabu copper molybdenum deposit.Our study shows there are three types of fluid inclusion related to mineralization in：gaseous,liquid,and halite,by means of microphysiography,microscopic temperature measurement and Laser Raman microprobe analysis on quartz fluid inclusion of ore bearing quartz vein.The variation range of the homogenization temperature is about 117℃~377℃,with average salinity of the fluid inclusion nearly 2.57%~45.59% NaCleqv.The fluid inclusion is mainly medium-high heat and high salinity.Besides CO2,there is CH4 and N2also in the gaseous.It was the estimated ore-forming pressure is close to 120~130 MPa,with lithostatic pressure depth nearly 4km^4.3km.The depth of the hydrostatic pressure is nearly 12km^13km,and fluid density approaches 0.68g/cm3.By combining with the H-O isotopes analysis results,this paper insists that the main source of metallogenic fluid is from magma,with small part of meteoric waters involved in the late stage.Daughter minerals containning and polyphase inclusion coexist with different filling percentage liquid or gaseous phase, with closely homogenization temperrature and different salinity,reflecting that metallogenic fluid experiences boilling.

关 键 词：冈底斯 达布 色日普 金矿 成矿流体 

分 类 号：P618.51[天文地球—矿床学]