黑龙江团结沟金矿床流体包裹体研究及矿床成因

STUDY ON FLUID INCLUSIONS OF TUANJIEGOU GOLD DEPOSIT IN HEILONGJIANG PROVINCE AND IMPLICATIONS FOR ITS GENESIS

对团结沟金矿床赋矿岩体石英斑晶及矿石中玉髓状石英内发育的原生流体包裹体进行了系统研究 ,结果表明 ,赋矿岩体石英斑晶中主要发育含子矿物三相、气液两相、纯液相等类型包裹体 ,而矿石玉髓状石英中主要发育气液两相包裹体。测温结果显示成矿流体温度为 1 30～ 370℃ ,盐度 2～ 1 0wt%NaCl;与赋矿岩体石英斑晶中发育的气液两相包体温度、盐度范围相近 ,结合成分及氢氧同位素特征 ,认为成矿流体主要来自岩浆热液及大气降水 。

A systematic study on fluid inclusions developed in quartz phenocryst of ore-bearing porphyry as well as in chalcedony quartz in ores of Tuanjiegou gold deposit was carried out, the results show that daughter crystal-bearing three-phase, aqueous two-phase and pure aqueous phase etc. occur in the fluid inclusions of quartz phenocrysts from ore-bearing porphyry, while aqueous two-phase primary fluid inclusions dominate in chalcedony quartz from the ores. Microthermometric study testifies that the temperature of ore-forming solutions is between 130 and 370℃, whereas salinity varies from 2-10wt%NaCl. These values are coincident with those for aqueous two-phase fluid inclusion in quartz phenocryst. Based on the compositional analytical results of fluid inclusions, it is concluded that the ore-forming fluids mainly originated from magmatic evolution and meteoric water. The deposit is of epithermal origin related to the intrusive activities of porphyry.