Abundant Mo, Ni, U ore deposit within the black shales at the bottom of Cambrian in Zunyi, Guizhou Province was considered hydrothermal sediment. According to the lithological and mineral feature and geochemical characters of the black shales in Xiaozhu area, Zunyi County, writers suggest that Mo, Ni, U ore deposits belong to hydrothermal vent sediment. Major proofs are asfollows:(1) Abundant pyrite, capillose, molybdenite, and ullmannite, chalcopyrite, sphalerite, barite, quartz, gypsum. (2) Abundant syn-d...