吉林六批叶沟金矿床流体包裹体研究

FLUID INCLUSIONS IN THE LIUPIYEGOU GOLD DEPOSIT,JILIN

通过对金矿石石英内的原生、假次生包裹体的系统研究,查明流体包裹体主要是NaCl-H2O型,其次是CO2型.测温结果显示成矿流体温度为100℃～352℃;盐度（ω（NaCl））=0.88%～8.55%,密度为0.356～0.997g/cm^3,估算成矿压力为48.83～71.29MPa,成矿深度为1.62～2.34km,属中深中温热液金矿床.成矿流体液相成分富含Na^＋、K^＋、Cl^-、SO4^2-及少量Mg^2＋和F^-;气相成分以H2O为主,其次是CO2和少量的CH4、C2H6、N2及微量的H2S和Ar.依据成矿流体Na^＋/K^＋=1.32、Na^＋/（Ca^2＋＋Mg^2＋）=100.61以及矿床与侵入体的关系进行判定,成矿流体主要来源于初始混合岩浆水,并有变质水及大气降水叠加.

Based on systematic observation on primary, pseudo -secondary inclusions in quartz in the Liupiyegou gold deposit, fluid inclusions are mainly NaCl- H2O type, and less CO2 type. Microthermometfic measurements show that temperature of ore- forming fluids is 100℃～352℃, salinity 0. 88%～8.55%, and density 0. 356～0.997g/cm^3. Estimated mineralizing pressure are 48.83 ～ 71.29MPa with mineralizing depth 1.62 ～ 2.34km. The deposit belongs to middle temperature and middle depth hydrothennal gold one. Liquid composition of ore -forming fluids is fichen in Na^＋ , K^＋ , Cl^- , SO4^2- and few Mg^2＋ and F^-. Gas composition is mainly H2O, then CO2, some CH4, C2H6 and N2 , and less H2S and Ar. According to that Na^＋/K^＋ is 1.32 and （Ca^2＋ ＋Mg^2＋ ） is 100.61, it is concluded that ore - forming, fluids came from initial magma water, and with mixed metamorphic and meteoritic water.