Discussion on Metallogenic Characteristics and Multi-stage Mineralization Process of Dulenggou Copper-cobalt Deposit in East Kunlun, Qinghai Province

Dulenggou copper-cobalt deposit is located in the eastern section of the near EW-trending east Kunlun tectonic belt. Formed in island arc environment of late Paleozoic, the deposit shows very complex mineralization process. Chlorite sericite phyllite is the main ore-hosting formation, structure deformation makes the minerals migrate and enrich. According to the geological characteristics of the deposit, the symbiotic relationship of minerals, texture and structural characteristics of ores and minerals, and the sequence of generation, the mineralization process can be divided into sedimentary exhalative mineralization period, tectonic deformation superimposed mineralization period and supergene period. Mineralized ore includes oxide ore, sulfide ore and mixed ore of the former two. In this paper, trace and rare earth elements analysis shows that the most reasonable interpretation of the mineral source is water and rock exchange between the hydrothermal fluid and surrounding rock, and the minerals should be multi-source. REE analysis shows similar characteristics with the metalliferous sediments from modern mid-ocean ridge and its hydrothermal fluid, but still there are some differences, reflecting that the ore formation process is a bit more complex, which may be caused by later enrichment and transformation.