易门狮子山铜矿流体包裹体研究

Research on the Fluid Inclusions of Shizishan Copper Deposit, Yunnan

在总结狮子山铜矿床地质特征基础上,开展了流体包裹体岩相学、显微测温、成分分析等研究,结果表明狮子山铜矿成矿流体为H2O-NaCl体系,包裹体分三大类:含子矿物包裹体(S型)、液体包裹体(W型)和气体包裹体(V型)。S型包裹体为气液固三相包裹体,子矿物多为石盐,加热时常晚于气相均一为液相。均一温度范围广,在192～570℃之间,盐度在31.2%～69.63%NaCleqv之间,高温高盐度流体包裹体的存在说明有深源流体叠加;W型包裹体均一温度范围在98～583℃之间,盐度低至中等,在3.55%～22.98%NaCleqv之间;V型包裹体为高温(平均454℃)低盐度(平均9.54%NaCleqv)包裹体;矿区高温阶段不同相比的S型、V型、W型包裹体共生,且均一温度相同,说明成矿流体经过沸腾作用。

This paper presents researches of the petrography, microthermometry, and composition of fluid inclu- sions of the Shizishan copper deposit. The results show that the ore fluid is H2O-NaCl system in this area. The fluid inclusions can be divided into three types, i. e. , daughter mineral-bearing fluid inclusion （S-type）, liquid fluid inclusion （W-type） and Vapor fluid inclusion （V-type）. Most of the daughter mineral in S-type is halite, with vanishing temperature higher than homogenization temperature of vapor-liquid. Its homogenization temperature amt salinity vary in ranges of 192℃ to 570℃ and 31.2% to 69.63 % NaCI, respectively, which suggest a deep sourced fluid. The homogenization temperature of W-type ranges from 98℃ to 583℃ , anti salinity is h）w to medi- um, from 3.55% to 22.98% NaCI . V-type inelusion is characterized by high-temperature （454℃ of homogeni- zation temperature on average） and low-salinity（9.54 % NaC] on average）. The coexistence of different phase ratios of all types＇ fluid inclusions in high temperature stage, with similar homogenization temperature, indicated that the ore-forming fluid experienced boiling. Therefore, it is suggested that boiling is the main metallogenie mech- anism. The genesis of this deposit belongs to sedimentary with deep resource hypothermal overprint.