藏南柯月铅锌锑银矿床流体包裹体研究  

A Study on Fluid Inclusions of the Keyue Pb-Zn-Sb-Ag Deposit in Southern Tibet,China

作　　者：杜晓飞[1,2] 程文斌[2] 李葆华[2] 李关清 

机构地区：[1]新疆维吾尔自治区人民政府国家305项目办公室,乌鲁木齐830000 [2]成都理工大学地球科学学院,成都610059 [3]西藏自治区地质矿产勘查开发局区域地质调查大队,拉萨851400

出　　处：《矿物岩石地球化学通报》2015年第6期1270-1281,共12页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：高等学校博士学科点专项科研基金(20125122120013);西藏自治区矿产资源潜力评价(1212010813025);国家自然科学基金项目(41372094)

摘　　要：为探讨柯月铅锌锑银矿床成矿流体的性质以及成矿机制,对其热液期各阶段含矿石英、菱铁/菱锰矿及方解石中流体包裹体进行了岩相学、显微测温学研究和激光拉曼光谱分析。结果显示,热液期Ⅰ阶段均一温度为250~281℃,盐度为10.24%~15.17%Na Cleqv,流体密度为0.90~0.95 g/cm3;Ⅱ阶段均一温度为173~330℃,盐度为3.87%~33.19%Na Cleqv,流体密度为0.85~1.15 g/cm3;Ⅲ阶段均一温度为173~241℃,盐度为3.06%~12.62%Na Cleqv,流体密度为0.85~1.00 g/cm3。柯月铅锌锑银矿床成矿流体早阶段为中温、中等盐度、含CO2的H2O-CO2-Na Cl体系,主阶段演化为中温、高中低盐度、富CO2、富金属元素的H2O-CO2-Na Cl体系,晚阶段演化为中低温、中低盐度、无CO2的H2O-Na Cl体系。流体包裹体组合特征及显微测温结果表明,成矿流体经历了流体不混溶过程,同时,流体不混溶作用是引起矿质的大量沉淀的主要因素。In order to investigate characteristics of ore-forming fluid and the ore-forming mechanism of the Keyue Pb-ZnSb-Ag deposit in the Southern Tibet Sb-Au metallogenic belt,fluid inclusions in three stage ore-bearing quartz,siderite / rhodochrosite and calcite veins from the Keyue Pb-Zn-Sb-Ag deposit have been studied through the petrography,microthermometry and the Laser Raman spectrometry. Results show that homogenization temperatures,salinities and densities are 250-281℃,10. 24%-15. 17% Na Cleqv,and 0. 9-0. 95 g/cm3 for fluid inclusions in stage Ⅰ minerals,173-330℃,3. 87%-33. 19% Na Cleqv,and 0. 85-1. 00 g/cm3 for fluid inclusions in stage Ⅱ minerals,and 173- 241℃,3. 06%-12. 62% Na Cleqv,and 0. 85-1. 15 g/cm3 for inclusions in stage Ⅲ minerals,respectively. From stage I to stage Ⅲ,oreforming fluids are changed from a CO2-bearing H2O-Na Cl system with moderate homogenization temperature and moderate salinity,to a CO2-H2O-Na Cl system with moderate homogenization temperature,high to low salinities,and enriched metal elements,and to an aqueous fluid with medium to low temperatures and low salinity. On the basis of characteristics of fluid inclusion assemblages and microthermometric results,it is believed that the ore-forming fluid has experienced the un-mixing process which is the main factor caused the precipitation of large quantity hydrothermal minerals in the deposit.

关 键 词：流体包裹体 激光拉曼 流体不混溶 柯月铅锌锑银矿床 西藏 

分 类 号：P618.4[天文地球—矿床学]