黑龙江省逊克县新民金矿床流体包裹体研究

Research on fluid inclusion in Xinmin gold deposit,Xunke county,Heilongjiang province

新民金矿床产出于小兴安岭一张广才岭多金属成矿带北缘。阐述了该金矿床的地质特征，指出金矿化包括石英-黄铁矿、石英-多金属硫化物和石英-方解石3个成矿阶段；并对前2个阶段硅化矿化石英细脉中的石英矿物的流体包裹体进行实验研究，提出该金矿矿石石英中的包裹体分为气液二相、含子矿物三相和富气相3种类型，以气液二相包裹体为主；流体包裹体的均一温度变化范围在234．8～420．5℃之间，盐度叫（NaCl）变化在2．6％～33．6％之间，可分为高温低盐度、中高温中低盐度和中温中高盐度流体等类型；流体包裹体气相成分主要为H20、CO2，液相成分也以H2O、CO2为主，含有Na^＋、K^＋、Ca^2＋、Mg^2＋离子，子矿物主要为石盐等；3类包裹体在同一矿物颗粒中同时共生发育，反映捕获流体为不均匀状态流体，指示成矿过程中存在一定程度的溶体不混溶作用。根据流体包裹体研究结果，确定矿床为浅成热液成因，而且矿床深部具有找寻斑岩型矿化的找矿潜力。

Xinmin gold deposit locates in the north edge of Xiaoxing＇ anling mountain-Zhangguangcai mountain polymetallic metallogenic belt. The paper introduces the geological characteristics of the deposit. And it is put forward that there were 3 mineralization stages, such as quartz-pyrite stage, quartz-polymetallic sulfide stage and quartz-calcite stage. Experimental researches are carried out on quartz mineral fluid inclusion in the silicification mineralized quartz stringers of the first two stages. And it is put forward that the inclusions can be divided into 3 types： gas-liquid two- phase, daughter mineral-containing triple-phase and rich gas phase, while most inclusions belong to the first type. The fluid inclusion, with homogenization temperature from 234.8℃ to 420.5℃, salinity w （NaCl） from 2.6% to 33.6%, can be divided into three types ： high temperature low salinity, medium-high temperature low-medium salinity and medium temperature medium-high salinity. The gas phase component is H20, CO2; the liquid pilase component is H2O,CO2 containing Na^＋ , K^＋ , Ca^2＋ , Mg^2＋ , and the daughter mineral in it is mainly rock salt. The different inclusions could develop symbiotically in the same mineral particle. The capturing fluid was inhomogeneous condition fluid and there was solution unmixing action in the mineralization process. The researches reveal that the deposit is an epithermal one and there is porphyry mineralization prospecting potential in the deep part.