WEI Wen-biao, ZHAO Qian, WANG Dai-bin, DAO Xue-qiang, MIAO Chang

(Yunnan Hualian Mineral Exploration Co. Ltd., Qujing 655000, China)

Abstract: Dulong Sn-Zn deposit is the third largest cassiterite-sulfide deposit in China. Beside Skarn and quartz-fluorite vein types, a new type of copper mineralization associated with Sn and Zn, which hosted in later Yanshanian granite-porphyry, were recently found in Mandong mining domain. This type ore bodies as nets, lentoid and quasi strata form, are controlled by granite-porphyry and the fractures intercommunicated to wall-bed rocks. The characteristics of mineralization elements in typical drills indicate that Cu, Sn, and etc., should derived from later Yanshanian granite-porphyry. LA-ICPMS U-Pb dating of Zircon from ore-hosted granite-porphyry suggests the age of ～88 Ma with the magmatism and ore-forming event. These studies mention above suggest that this type of copper mineralization should related to later Yanshanian magmatic hydrothermal. Contrasted to Skarn and quartz-fluorite vein types, the granite-porphyry type of copper mineralization has virtues with clear genesis, exploration indicators and distribution. Future explorations around later Yanshanian granite-porphyry are favorable with rich-mica, poor crystallization, and stronger alteration and broken in Mandong mining domain and surrounding areas.

Keywords: copper minerlization; new type; granite-porphyry; Yanshanian magmatism; Dulong; Southeast Yunnan Province

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ACTA MINERALOGICA SINICA Vol. 36, No. 4, 2016, Page 455-462