青海多日茸铅锌多金属矿床成矿流体特征及矿床成因

青海多日茸铅锌多金属矿床是我国重要的铜铅锌多金属矿产资源基地之一,但该矿床形成机理研究尚浅,制约了对矿床特征的认识。为了科学评价研究区矿产资源,在收集前人区域成果的基础上,开展野外地质调查,分析成矿流体性质,探讨矿床成因。研究结果表明:包裹体主要为气液两相包裹体和纯CO_2包裹体,包裹体流体属于H_2O-CH_4-N_2-NaCl体系,表明成矿流体为低温、中低盐度、低密度流体。碳、氧、硫和铅同位素特征分析表明成矿流体来源于深部。多日茸铅锌多金属矿床大体经历了四大形成过程,为浅成低温低盐低密度铅锌多金属矿床。

Ore-forming fluid characteristics and metallogenesis of the Duorirong lead-zinc polymetallic deposit in Qinghai Province

Duorirong Pb-Zn polymetallic deposit is one of the important Cu-Pb-Zn polymetallic mineral resource base in China. The study of deposit formation mechanism is weak, which restricts the understanding of deposit characteristics. In order to scientifically evaluate the mineral resources in the research area, based on collecting previous regional achievements, the field geological survey was Carried out, the character of ore-forming fluid was analyzed, and genesis of ore deposit was Discussed. The results show that the ore-forming fluids are mainly gas-liquid two-phase inclusions and pure CO₂ two-phase inclusions, the fluid belongs to H₂O-CH₄- N₂-NaCl system, which is low temperature, medium low salinity and low density fluid. The analysis of carbon, oxygen, sulfur and lead isotopic characteristics shows that the ore-forming fluid came from the deep part. The polymetallic deposit of Duorirong lead zinc has undergone four major formation processes, and it is a low temperature, low salt and low density lead-zinc polymetallic deposit.