滇西猴桥钼矿床流体包裹体研究  

Fluid Inclusions Study of the Houqiao Molybdenum Deposit in Western Yunnan

作　　者：邹灏[1,2] 张强[1] 李欣宇[1] 龙训荣[1] 韦绍裔 方乙[3] ZOU Hao ZHANG Qiang LI Xin-yu LONG Xun-rong WEI Shao-yi FANG Yi(College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China Key Laboratory of Tectonic Controlled Mineralization and Oil Reservoir, Ministry of Land and Resources, Chendu 610059, China School of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China)

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]构造成矿成藏国土资源部重点实验室,成都610059 [3]西南石油大学地球科学与技术学院,成都610500

出　　处：《矿物岩石地球化学通报》2016年第5期949-956,共8页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：四川省教育厅科研项目(15ZB0073);资源勘查工程专业教育部卓越工程师教育培养计划项目(13z002-07);卓越计划教学体系建设与改革项目(13JGZ16)

摘　　要：为探讨猴桥钼矿床的成矿流体特征，开展了系统的矿床地质研究和流体包裹体岩相学、显微热力学及单个包裹体成分的激光拉曼显微探针分析。结果表明，脉石矿物石英中发育了气相、气液两相和纯液相3种流体包裹体，气液两相包裹体的均一温度为102～334℃，主要集中在180～280℃，推算盐度为4.49％～12.51％NaCleqv、密度为0.65～0.96 g／cm3，反映成矿流体具有中-低温、中-低盐度、低密度的特征。单个包裹体成分研究表明，猴桥钼矿流体包裹体主要成分为水。经验公式计算得到猴桥钼矿床的成矿压力为28～92MPa，推算其成矿深度为0.9～3.1km（平均为2km），成矿深度不大。成矿流体温度和盐度波动范围较大，指示成矿过程中流体性质发生了较大变化，暗示流体混合作用可能是导致钼矿沉淀的重要原因。In order to discuss characteristics of the ore-forming fluid of the Houqiao Mo deposit,a systematical study on geology and petrography,microthermometry,and laser Raman spectrometry of fluid inclusions in the the deposit has been carried in this paper.Detailed petrographic observation shows that there are three types of fluid inclusions in quartz veins. They include aqueous two-phase inclusions,gas and pure aqueous phase inclusions.Microthermometric studies indicate that the aqueous two-phase inclusions have homogenization temperatures ranging from 1 02 to 334℃,mainly between 1 80 and 280℃,salinities ranging from 4.49 to 1 2.51% NaCl（eqv）and densities ranging from 0.65 to 0.96 g/cm3.This shows that the ore-forming fluid has the characteristics of medium to low homogenization temperatures,medium to low sa-linities and low density.Laser Raman Spectroscopic analyses of fluid inclusions suggest that the ore-forming fluid was of the NaCl-H2 O system.On the basis of empirical equation,the calculated pressures of the Houqiao molybdenum range from 28MP to 92MP,corresponding to the depth of 0.9-3.1km（average 2km）which means that the mineralization occurred at relative shallow level.The relative large variations of homogenization temperatures and salinities of the ore-forming fluid indicate that there were relatively large changes of the fluid properties in the mineralization process,and thus infer that the mixing of the fluids could be an important factor causing the precipitation of molybdenum.

关 键 词：流体包裹体 成矿流体 猴桥钼矿床 滇西 

分 类 号：P618.65[天文地球—矿床学]