黔东南平秋金矿成矿流体特征及其演化过程  

Characteristics and evolution of ore-forming fluids of Pingqiu Au deposit,Southeast Guizhou

作　　者：刘旭[1] 戢兴忠 李源洪[1] 张石竹 袁青松 LIU Xu;JI Xingzhong;LI Yuanhong;ZHANG Shizhu;Yuan Qingsong(Geological Team No.106,Bureau of Geology and Mineral Exploration and Development Guizhou Province,Zunyi563000,Guizhou,China;MLR Key Laboratory of Metallogeny and Mineral Assessment(Ministry of Natural Resources),Institute of Mineral Resources,CAGS,Beijing 100037,China)

机构地区：[1]贵州省地质矿产勘查开发局106地质大队,贵州遵义563000 [2]中国地质科学院矿产资源研究所,自然资源部成矿作用和资源评价重点实验室,北京100037

出　　处：《矿产与地质》2022年第2期316-322,共7页Mineral Resources and Geology

摘　　要：平秋金矿为黔东南地区一个重要的石英脉型-蚀变岩型矿化共存的金矿床。其中,在石英脉型矿化阶段,早期为石英-金属硫化物脉体,晚期为纯净的石英脉体。流体包裹体研究结果显示,早期石英中富含气-液两相及富CO_(2)包裹体,晚期石英中富含气-液两相及纯液相包裹体。显微测温结果显示,早期流体具有中高温(280℃~340℃)、低盐度w(NaCleq)(4%~6%)、低密度流体(0.72~0.79 g/cm^(3))特征,且富含CO_(2);晚期流体具有中低温(160℃~200℃)、低盐度w(NaCleq)(1%~4%)、低密度(0.84~0.96 g/cm^(3))特征,且不含CO_(2)。结合前期的研究成果认为,在构造运动的作用下,温度的降低、CO_(2)的出溶是平秋金矿床石英脉型金矿成矿的主要原因。Pingqiu gold deposit is an important gold deposit with coexistence of quartz-vein-type and alteredrock-type mineralization in Southeast Guizhou.Among them,in the stage of quartz vein type mineralization,quartz-metal sulfide veins are formed in the early stage,and pure quartz veins are formed in the late stage.The fluid inclusion study result shows that the early quartz is rich in gas-liquid two-phase and CO_(2)-rich inclusions.The late quartz is rich in gas-liquid two-phase and pure liquid inclusions.The microscopic temperature measurement result shows that the early fluid has the characteristics of medium-high temperature(280℃-340℃),low salinity w(NaCleq)(4%-6%),low density fluid(0.72-0.79 g/cm^(3)),and is rich in CO_(2).The late fluid has the characteristics of low temperature(160℃-200℃),low salinity w(NaCleq)(1%-4%),low density(0.84-0.96 g/cm^(3)),and does not contain CO_(2).Combined with the previous research results,it is considered that under the action of tectonic movement,the decrease of temperature and the exsolution of CO_(2) are the main reasons for the quartz vein-type gold mineralization in Pingqiu gold deposit.

关 键 词：平秋金矿 石英脉型 流体包裹体 CO_(2)的出溶 黔东南 

分 类 号：P618.51[天文地球—矿床学]