黑龙江伊春蜂房沟金矿流体包裹体特征及矿床成因机制  

Characteristics of fluid inclusions and mineralization mechanism of Fengfanggou gold deposit in Yichun,Heilongjiang Province

作　　者：张朋[1] 乔树岩[1] 赵华伟[2] 聂喜涛[2] 门兰静[3] 崔培龙[3] 杨凤超[1,3] 

机构地区：[1]沈阳地质矿产研究所,沈阳110034 [2]吉林省地质调查院,长春130061 [3]吉林大学地球科学学院,长春130061

出　　处：《世界地质》2011年第3期335-344,共10页World Geology

基　　金：国家自然科学基金(40472050;40772052)

摘　　要：蜂房沟金矿位于佳木斯地块东北部,矿石自然类型为石英脉型。经矿物流体包裹体岩相学、显微测温和激光拉曼探针分析,探讨成矿流体性质、矿床成因类型及成矿机制。研究结果表明:①矿物流体包裹体以气液两相为主,含有少量的纯气相和纯液相包裹体,成矿流体的均一温度集中在240℃～270℃、成矿流体盐度为1.74～6.30 wt%NaCl、密度0.68～0.92 g/cm^3、成矿压力为16～22 MPa、估算成矿深度为1.6～2.2 km,包裹体气相成分主要为CO_2和H_2O,含少量CH_4,总体属于CO_2-H_2O-NaCl体系;②成矿流体是一种不混溶流体,流体在不混溶过程中造成的相分离是金沉淀成矿的主要机制;③通过与典型造山型金矿对比,该矿床属于浅成造山型金矿,成矿机理可由碰撞成岩成矿与流体作用(CMF)模式解释。The Fengfanggou gold deposit is located in the northeast of Jiamusi block and its ore is quartz vein type in nature. The metallogentic fluid characteristics, genetic type of mineral deposit and metallogentic mechanism have been investigated through petrography, microthermometry and Raman microprobe of fluid inclusions. The resuits show （1） The main fluid inclusion is gas-liquid two-phase inclusion, with a little pure gaseous and pure liquid inclusions; the homogenization temperature of fluid inclusions is 240 ℃- 270℃, the salinity is 1.74 - 6.30 wt% NaCI, the density is 0. 68 - 0. 92 g/cm3, and the metallogentic pressure and depth are 16 -22 MPa and 1.6 - 2. 2 km, respectively; the gaseous composition of inclusions are CO2 and H2O with a little CH4, belonging to CO2-CH4 -H2O system. （2）The metallogenic fluid is immiscible fluid, and the phase separation fomed in the immiscibilition of metallogenic fluids is the dominant mechanism for gold deposition and mineralization. （3）Comparing with other typical orogenic gold deposits, Fengfanggou gold deposite belongs to hypabyssal orogenic gold deposit, and its metallogenic mechanism can be explained by collisional petrogenesis and mineralization and fluid action （CMF） model.

关 键 词：蜂房沟金矿 流体包裹体 造山型金矿 CMF模式 佳木斯地块 

分 类 号：P618.51[天文地球—矿床学] P595[天文地球—地质学]