云南大坪超大型金多金属矿床地质地球化学特征

大坪金矿床是哀牢山金矿带上的超大型金多金属共生矿床.矿体为赋存于闪长岩体内部近平行的多金属硫化物-石英薄脉.矿床地质、流体包襄体地球化学和同位素地球化学研究表明:成矿作用与中、新生代的区域构造-岩浆活动密切相关,至少可分为燕山期石英-黄铁矿和喜山早期石英-方铅矿两期;早期形成金矿化,晚期形成铅和银矿化并伴生金矿化;二者叠加于同一容矿空间,形成多期叠加的复式铅、锌、银、金共生矿床.成矿物质与成矿流体的来源一致,各成矿期流体均是以深源流体为主的壳-幔混合流体,但具有不同的地球化学特征,是相对独立的成矿流体体系.矿床成因属中-高温热液硫化物-石英脉型.

GEOLOGY AND GEOCHEMISTRY OF DAPING SUPER- LARGE GOLD -POLYMETALLIC DEPOSIT IN YUNNAN PROVINCE, CHINA

Daping gold -polymetallic deposit, located in the southern Yunnan Province, is a super- large quartz -sulfide vein type deposit. Results of ore geology, fluid inclusion and stable isotope studies on the deposit show that main quartz veins were formed by superposition of at least two period mineralization of the early quartz - pyrite period related to the Au and the later quartz - galena period related to Pb, Ag and Au. The different period veins had complex relationships in space. It was concluded from synthetical analyses that the fluids of two periods came from relatively independent systems correlated to different magmatism. The deposit was formed by filling in the same space with late - stage ores, and belongs to poly - metallic sulfide - quartz vein type polymetallic hydrothermal deposit.