易门狮子山铜矿流体包裹体研究

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。

Research on the Fluid Inclusions of Shizishan Copper Deposit, Yunnan

This paper presents researches of the petrography, microthermometry, and composition of fluid inclusions 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 and salinity vary in ranges of 192℃ to 570℃ and 31.2% to 69.63 % NaCleqv, respectively, which suggest a deep sourced fluid. The homogenization temperature of W-type ranges from 98℃ to 583℃, and salinity is low to medium, from 3.55% to 22.98% NaCleqv. V-type inclusion is characterized by high-temperature (454℃ of homogenization temperature on average) and low-salinity(9.54 % NaCleqv 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 metallogenic mechanism. The genesis of this deposit belongs to sedimentary with deep resource hypothermal overprint.