黔西南卡林型金矿成矿流体性质及其与矿化的关系

INVESTIGATION INTO METALLOGENIC FLUID FEATURE IN CARLIN TYPE GOLD DEPOSITS AND ITS RELATION TO MINERALIZATION IN SOUTHWEST GUIZHOU PROVINCE

对黔西南具有代表性意义的３个大型矿床中的包裹体进行了系统研究，包括单个包裹体的荧光光谱分析、ＦＴＩＲ分析、ＬＲＭ分析、冷－热两用台分析等．研究表明：本区卡林型金矿成矿流体的盐度极低，均一温度以中、低温为主，水溶液以ＳＯ２－４－Ｃｌ－－Ｃａ２＋－Ｎａ＋（Ｋ＋）为主，成矿环境主要为弱酸性较还原环境；成矿流体中均含有机质，以成熟或过成熟的芳香族化合物为主；流体中有机质以与水不混溶的形式迁移；金的有机络合物受热裂解可能是导致金矿成矿的主要原因．

A systematic research is made in this paper into the inclusions in the three large_sized ore deposits typical of those in the Southwest Guizhou Province, in order to reveal the metallogenic fluid feature in Carlin type gold deposits and its relation to the mineralization. A study of a single inclusion is also included in this systematic research, in terms of fluorescent spectral analysis, FTIR analysis, LRM analysis, and cool_hot stage analysis. The present research shows that the metallogenic fluid in the selected Carlin type gold deposits is extremely low in salinity, intermediate and low in homogeneous temperature, and contains SO 2- 4_C1 -_Ca 2+ _Na +(K +) in its water solution. The metallogenic environment is mainly dominated by the weak acid and relatively reduction. The metallogenic fluid contains some organic matter dominated by mature or over_mature aromatic series. The organic matter in the metallogenic fluid migrates in the form of immiscibility with water. The gold_deposit metallogenesis results probably mainly from the thermal cracking of the gold organic complex compounds.