滇西大坪金矿流体包裹体特征及其地质意义  

Fluid Inclusion Characteristics and Geological Significance of the Dianxi Daping Gold Deposit

作　　者：张旭奇 张佳伟 罗林菊 

机构地区：[1]桂林理工大学地球科学学院,广西 桂林 [2]四川省第六地质大队,四川 泸州

出　　处：《地球科学前沿(汉斯)》2025年第1期13-21,共9页Advances in Geosciences

摘　　要：大坪金矿床是赋存于闪长岩体中的含金多金属硫化物热液石英脉型金矿,矿体呈脉状,三家河断裂、小新街断裂、小寨–金平断裂控制着矿区地层岩性。成矿过程可划分为3个阶段:1) 白钨矿–石英脉阶段;2) 团块状多金属硫化物阶段;3) 碳酸盐–石英脉阶段。石英脉中流体包裹体分为富液相CO2包裹体、富气相CO2包裹体、CO2型包裹体,以CO2-H2O包裹体为主。CO2-H2O包裹体的完全均一温度236.5℃~379.2℃,盐度为1.74~18.63 wt% NaCl,成矿流体具有中–高温、中–低盐度、富含CO2并且含有少量N2的特征,属于CO2-H2O-NaCl ± N2体系,且成矿流体的温度逐渐降低。成矿流体来源复杂,为深源的壳幔混合流体,即成矿流体的主体为深源的流体,后期有浅部的混合流体加入。大坪金矿矿区北部属于造山型金矿,南部属于浅成低温热液型金矿。The Daping gold deposit is a hydrothermal quartz vein-type gold deposit containing gold-bearing polymetallic sulfides hosted in a diorite intrusion. The ore bodies occur as veins, with the regional stratigraphy and lithology controlled by the Sanjiahe Fault, Xiaoxinjie Fault, and Xiaozhai-Jinping Fault. The mineralization process can be divided into three stages: 1) Scheelite-quartz vein stage, 2) Massive polymetallic sulfide stage, and 3) Carbonate-quartz vein stage. Fluid inclusions in the quartz veins can be classified into liquid-rich CO2 inclusions, vapor-rich CO2 inclusions, and CO2-H2O inclusions, with CO2-H2O inclusions being predominant. The homogenization temperatures of CO2-H2O inclusions range from 236.5˚C to 379.2˚C, and their salinities range from 1.74 to 18.63 wt% NaCl equivalent. The ore-forming fluids are characterized by medium-to-high temperatures, medium-to-low salinities, CO2 enrichment, and the presence of small amounts of N2, belonging to the CO2-H2O-NaCl ± N2 system. The temperature of the ore-forming fluids gradually decreased over time. The ore-forming fluids have a complex

关 键 词：流体包裹体 大坪金矿床 成矿流体 

分 类 号：P61[天文地球—矿床学]