Geological Characteristics of Ores from the Jianchaling Nickel Sulfide Deposit
WANG Ruiting HE Ying LIU Minwu QI Liang WANG DongshengDepartment of Geology, Northwest University, Xi'an, Shaanxi ,710069; Northwest Bureau of Geological Exploration for Nonferrous Metals, Xi'an, Shaanxi ,710054;Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou ,550002)
Based on the study of the geological background of the Jianchaling nickel sulfide deposit and the geological-geochemical characteristics of its ores, it is concluded that the formation of the nickel sulfide deposit is closely related to Jianchaling magnesium-enriched ultrabasic intrusion. Its ore-forming substance was derived from the depth, and its complex ore-forming process includes on-the-spot melting segregation that took place during the ascending and the emplacement of the parent magma derived from partial melting of the upper mantle through the upper mantle lithosphere, the autometamorphism after the formation of the intrusion, and the hydrothermal fluid superposed reformation resulting from the intrusion of intermediate and acid magma. The metasomatism and reformation process of late intermediate and acid magma is the main factor responsible for the formation of some rich nickel orebodies. The nickel deposit has a low content of PGE and copper, and should hence belong to the magmatic liquation-hydrothermal reformation type ore deposit.