【摘要】 大水金矿氧化带下部,发育大量的微细粒浸染状、细脉状黄铁矿和黄铜矿,并出现砷黝铜矿。地表氧化矿中的赤铁矿,是黄铁矿等原生硫化物氧化所致;在矿石矿物成分上,黄铁矿、黄铜矿和砷黝铜矿的Au含量普遍较高。黄铁矿中的Co/N i比值多大于2,与岩浆成因黄铁矿相吻合。流体包裹体均一温度为105℃～400℃。3δ4S=-1.8‰～+4.1‰,1δ3C=-2.7‰～+4.3‰,1δ8O=6.63‰～19.42‰,δD=-101‰～-75‰。成矿流体主要来源于岩浆热液,碳、硫和成矿元素主要来源于赋矿闪长岩体,为富硫化物的闪长岩型金矿床。砷黝铜矿对找矿与勘探有指示作用。更多还原

【Abstract】 Large amounts of fine disseminated and veinlet pyrite and chalcopyrite with the presence of tennantite occur in the unoxidized zone below the oxidized zone in the Dashui gold deposit.Pyrite,chalcopyrite and other sulfides were oxidized into hematite in the oxidized ores.Electron microprobe analysis indicates that gold is richening in pyrite,chalcopyrite and tennantite.Co/Ni ratios from pyrite are mostly greater than 2,being consistent with those of magma-type pyrite.Fluid inclusion data in calcite indicate that homogenization temperatures are about 105℃ to 400℃.Isotopic data show that δ34S values of pyrite range from-1.8‰ to +4.1‰,δ13C values of calcite from-2.7‰ to +4.3‰,and δ18O and δD values of calcite from +6.63‰ to +19.42‰ and-101‰ to-75‰,respectively.Ore-forming fluids were largely magma water.Carbon,sulfur and metallogenic elements chiefly came from the hosted diorite.The gold deposit is a sulfides-rich diorite-type.Tennantite may be served as an important indicator for ore searching and prospecting.更多还原