吉林白山市大横路Cu-Co矿床变质成矿流体特征

大横路Cu-Co矿床为一产于元古宙老岭群大栗子组变质地层中的新类型层控矿床，矿床形成经历了沉积成岩成矿、区域变形变质成矿两期主要成矿作用过程。对变质热液期形成的石英、方解石等矿物中发育的流体包裹体研究表明，成矿流体为一中低温、以H2O为主、含CO、CO2、N2及Cl^-、HCO3^-、SO4^2-、HS^-、CH4、C2H4、C3H8、C4H6等有机质的盐水溶液，早期成矿流体盐度ω(NaCl)可高达45．72％，晚期热液盐度ω（NaCl)为2.06%-12.53%。反映在来源上，早期成矿流体主要来自变质热液，晚期则有大量大气降水参与。变质热液成矿作用对Cu-Co工业矿床形成起了重要作用。

THE FEATURES OF METAMORPHIC MINEROGENETIC FLUID OF DAHENGLU Cu - Co DEPOSIT IN BAISHAN COUNTY, JILIN PROVINCE

Dahenglu CuCo deposit is a new kind of strata bound deposit which occurs in Proterozoic metamorphic strata of Dalizi formation in Laoling group. The forming of the deposit includs two periods of mineralization, i.e. sedimentary and regional deformation-metamorphic mineralization periods. The study on the fluid inclusions in quartz and calcite of metamorphic hydrothermal period shows mineralizated fluid is saltwater solution. The temperature is medium to law. Besides H 2 O, the fluid inclusions also contain CO,CO 2 ,N 2 ,Cl - ,HCO - 3 ,SO 2- 4,HS - and organic matters like CH 4 ,C 2 H 4 ,C 3 H 8 , C 4 H 4 , etc. The salinity of early mineralizated fluid is as high as 45.72%NaCl, but at late stage, it is 2.06 to 12.53%NaCl. This shows that the early mineralizated fluid derived from metamorphic hydrothermal fluid and at the late stage, meteoric water had participated. Metamorphic hydrothermal fluid played an important prole in the forming of the CoCu deposit.