煎茶岭硫化镍矿床矿石地球化学特征

通过对煎茶岭硫化镍矿床地质背景及矿石的地质地球化学研究，认为该镍矿床的形成与煎茶岭镁质超基性岩体密切相关，其成矿物质来源于深部，存在多种成矿作用，包括源自上地幔局部熔融的母岩浆在通过上地幔岩石圈上升侵位过程中发生的就地熔离作用和岩体形成后的自变质作用、中酸性岩浆侵入引起的热液叠加改造作用等。后期中酸性岩浆热液的交代改造是形成该矿床中部分富镍矿体的主要原因。该镍矿床PGE含量较低且贫铜，成因上应属岩浆熔离-热液改造型矿床。

Geological Characteristics of Ores from the Jianchaling Nickel Sulfide Deposit

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.