翠宏山铁多金属矿床成矿流体包裹体及硫同位素特征

Metallogenic fluid inclusions and sulfur isotope characteristics of Cuihongshan iron polymetallic deposit

对翠宏山铁多金属矿床成矿早期阶段钨钼矿体中的石英、成矿晚期阶段铅、锌、铜矿体中的萤石流体包裹体特征及均一温度、盐度的研究表明,从早期钨钼成矿阶段至晚期铅、锌、铜成矿阶段,侵入体内接触带至外接触带,经历了一个温度剧降和盐度显著增加的过程。钨钼成矿阶段成矿流体主要为岩浆热液流体,成矿过程为单一的成矿流体冷却过程;在晚期铅、锌、铜成矿阶段,来自岩浆中的温度较高的热流体与围岩地层中的大气降水等低温、高盐度流体混合,使成矿流体温度剧降和盐度增高,导致铅、锌、铜等成矿物质的沉淀。辉钼矿和方铅矿的δ34S(×10-3)测试结果表明,侵入体内接触带钨钼矿体的成矿物质主要来自岩浆热液;围岩地层中铅、锌、铜矿体的成矿物质,除岩浆热液来源外,部分可能来自雨水对地层中硫酸盐岩中硫及其他成矿物质的淋滤。

The characteristics of quartz in tungsten-molybdenum ore body （early mineralization stage） and fluorite fluid inclusions in lead-zinc-copper ore body （late mineralization stage） , and the research of homogeniza- tion temperature and salinity of iron polymetallic deposit in Cuihongshan show that, from the early stages of tung- sten-molybdenum mineralization to the late stages of lead-zinc-copper mineralization, the intrusion experienced a sharp drop of temperature and salinity significantly increased process from internal to external contact zones. The metallogenic fluid of tungsten-molybdenum ore body is magmatic hydrothermal fluids, and the metallogenic process is a single fluid cooling process. In lead-zinc-copper mineralization stage, the high temperature fluid from magma mixed with the low temperature, high salinity fluid in surrounding strata, which made the fluid temperature drop- ping and salinity increased, and leading to the depostion of lead, zinc, copper and other minerals. The 834S （%o） test results of molybdenite and galena show that metallogenic materials of tungsten and molybdenum ore body mainly from the magmatic hydrothermal in internal contact zone; the metallogenic materials of lead-zinc-copper ore body in surrounding strata besides to magmatic hydrothermal origin, still may come from the leaching by rain to sulfur and other metallogenie minerals of sulfate.