Abstract:

The Dongmozhazhua ore deposit is a new largesize lead-zinc deposit in the south of Qinghai Province. Based on a considerable number of polished ore sections as well as massive spectrum and electron microprobe analyses, the systematic study on ore minerals is finished. The results show that the ore mineral is intermediate-temperature hydrothermal mineral association. Wall rock alteration is intermediatetemperature alteration. Sulfide isotope has the characteristic of the sulfides isotope in massive sulfide deposit. Combining the study results, it is believed that Dongmozhazhua leadzinc deposit has experienced three stages mineralization. In the stage of marine dolomite sedimentation, there exist hydrothermal sedimentationexhalation mineralization of sphalerite, pyrite and else metal sulfides. The structure environment of the back （front） arc basin is characterized by development of massive sulfide leadzinc deposits. In the late tectonic activity and hydrothermal process, the leadzinc deposit maybe occur hydrothermal superimposition and reformation. Therefore, the Dongmozhazhua leadzinc deposit has characteristics of the multistage and superimposed metallization.

Key words: sulfide mineral, leadzinc deposit, Dongmozhazhua, Qinghai