中国主要类型锑矿床矿物包裹体地质地球化学

INCLUSIONS CHARACTERISTICS AND GEOCHEMISTRY OF MINERALS IN MAIN TYPE ANTIMONY DEPOSITS IN CHINA

讨论了中国主要类型锑矿床矿物包裹体形态、大小、气液比值、包裹体爆裂温度、均一化温度和盐度。认为锑矿床中辉锑矿最佳形成温度为180℃～220℃,盐度变化范围为(5～10)wt%NaCl。矿物包裹体成分变化较大,均以H2O为主,气相成分主要为CO2,液相成分中以Na+,Ca2+为主,K+、Mg2+次之,K+/Na+比值一般小于1,Ca2+/Mg2+比值一般大于1,说明锑矿床的成矿流体液相组分以H2O、Na+、Ca2+、F-、Cl-为主,气相组分以CO2为主。根据矿物包裹体中某些成分的相关性,可判别矿床之间的关系,指导找矿勘查工作。

Deals with the form , size, gas/liquid ratio, explosion and homogenization temperature, and salinity of the inclusions of minerals in main type antimony deposits in China. It is regarded that the most probable temperature of formation for stibnite is from 180℃ to 220℃, and the salinity ranges from (5～10)wt%NaCl. The compositions of inclusions of minerals change in a wide range with H 2O as the principal phase, CO 2 as the principal gas phase, and Na +,Ca 2+ as the principal and secondly K +、Mg 2+ in the liquid phases, in which the K +/Na + ratios are generally less than 1, and Ca 2+ /Mg 2+ ratios more than 1. The above characteristics suggest that the liquid phases of the ore-forming fluids are mainly composed of H 2O, Na +, Ca 2+ , F -, Cl -, and the gas phase mainly of CO 2.