黑龙江漠河推覆带前哨林场锑金矿床流体包裹体特征及其地质意义

Characteristics of fluid inclusions and geological significance of Qianshao forest farm Sb-Au deposit in Mohe nappe structure,Heilongjiang

从矿床地质出发,报道了大兴安岭漠河地区前哨林场锑金矿的流体包裹体岩相学、显微测温及气相成分,探讨了前哨林场锑金矿床流体包裹体性质、成岩成矿时间及空间分布特征。研究结果表明:其成矿过程经历灰白色石英-黄铁矿阶段(Ⅰ)、灰黑色石英-辉锑矿-黄铁矿阶段(Ⅱ)及乳白色石英-少硫化物-碳酸盐阶段(Ⅲ)等3个阶段;矿物流体包裹体类型以气液两相型包裹体为主,并含少量CO 2三相包裹体,成矿流体应为中低温、低盐度的H2O-CO2-NaCl体系热液,现阶段所卸载的矿(化)体为主成矿晚期的矿体,该期矿体的西北部找矿潜力较大;结合矿区地质特征,初步认为其形成于晚侏罗世晚期-早白垩世。

Based on the geology of the deposit,the authors report herein the petrographic,microscopic temperature measurement and vapor phase composition of fluid inclusions of Qianshao forest farm Sb-Au deposit in Mohe area of Great Xing an Range,and discuss the characteristics of fluid inclusions,time and spatial distribution of diagenesis and mineralization in Qianshao forest farm Sb-Au deposit.Results show that the ore-forming process experienced three stages:gray white quartz-pyrite stage(Ⅰ),gray black quartz-stibnite-pyrite stage(Ⅱ)and milky white quartz-less sulfide-carbonate stage(Ⅲ).The mineral fluid inclusions are mainly gas-liquid two-phase inclusions,and small amount of contain CO 2 three-phase inclusions.The ore-forming fluid should be the medium-low temperature and low salinity hydrothermal solution of the H 2O-CO 2-NaCl system.The ore bodies unloaded at this stage are the late stage of main metallogenic,and the northwest part of the ore bodies in this stage has great prospecting potential.According to the geological characteristics of the mining area,it is preliminarily considered that it was formed in the late Late Jurassic--Early Cretaceous.