【摘要】 维拉斯托矿床位于大兴安岭南段西坡有色金属成矿带,包括花岗岩型和石英脉型锡钨矿、脉状铜锌矿,其形成与深部碱长花岗岩密切相关。通过岩相学、显微测温、激光拉曼等手段对维拉斯托碱长花岗岩、云英岩、锡石闪锌矿石英脉3种地质体中熔融、熔流以及流体包裹体特征进行研究。以上3种地质体中包裹体类型由以熔融包裹体为主—以熔流包裹体为主—以气液包裹体为主渐变;熔融包裹体的固相成分以钠长石为主,少量白云母和萤石,熔流包裹体的固相成分为黄玉;由云英岩到锡石闪锌矿石英脉,均一温度降低,盐度略有降低,变化具有继承性。维拉斯托成矿流体经历了岩浆到热液的连续演化过程,晚期形成浆液过渡态流体,成矿作用始于岩浆晚期,浆液过渡态流体与锡成矿作用具有直接的联系。更多还原

【Abstract】 The Weilasituo tin polymetallic deposit is located in southern part of the Da Hinggan Mountains non-ferrous metallogenic belt. The mineralization is closely related to the alkali feldspar granite at depth. The characteristics of melt inclusion, melt-fluid inclusion and fluid inclusion in the granite, greisen and cassiterite sphalerite quartz veins were studied, and the results indicate that the types of inclusions gradually vary from melt inclusion, melt-fluid inclusion to fluid inclusion in above-mentioned bodies. Solid phase composition in melt inclusion comprises mainly albite, minor muscovite and fluorite, while only topaz in melt-fluid inclusion. The homogenization temperature and salinity of the fluid inclusion is decreasing from greisen to cassiterite-sphalerite quartz veins. The process of the ore-forming fluid evolution is continuous from magmatic state to hydrothermal state through magma-hydrothermal transitional state. Magma-hydrothermal transitional fluid is formed in the end stage of magmatic evolution when mineralization started. Tin mineralization has direct assoication with magma-hydrothermal transitional fluid.更多还原