METALLOGENIC CHARACTERISTICS OF SHAOXIEGOU TUNGSTEN-COPPER-MOLYBDENUM DEPOSIT IN EJINA QI, INNER MONGOLIA

The Shaoxiegou tungsten-copper-molybdenum deposit in Ejina Qi is occurred in the contact zone between the Carboniferous-Permian granitoid body and Lower Carboniferous Lyutiaoshan Formation, and in the nearby rock mass as well. The mineralized alteration zonation is generally annular, with the outermost zone of carbonatization, epidotization and chloritization, the secondary outer zone of skarnization, hornfelsization and scheelite mineralization, the middle zone of silicification, greisenization and molybdenite mineralization, and the inner zone of silicification, malachitization and chalcopyrite mineralization. From outside to inside, metallogenic elements are enriched from high temperature to low, forming tungsten deposit → molybdenum deposit → copper deposit. The paper also discusses the genetic type and metallogenic age of the deposit combined with the orebody characteristics, geochemical characteristics of ore-bearing rock mass and zircon U-Pb dating data. It is considered that the deposit is genetically of porphyry type, with the metallogenic time of 305.1±1.9 Ma, which was formed in Late Carboniferous.