Abstract:

Banlashan porphyry molybdenum deposit is one of most important deposits in the poorly known Mesozoic Xilamulun Mo metallogenic belt in south segment of Greater Xing’an Mountains. The deposit is located in Late Jurassic volcanic rocks. The Mesozoic intrusive complex developed in mining area consist of granodiorite, diorite and granite porphyry. It was thought that formation of the deposit was related to the latest stage of magmatic activities. Zircon SHRIMP U-Pb dating from granite poprhyry indicate that the ore-forming-related granite porphyry emplaced at (132.1±1.8) Ma. It was cosidered that Mo mineralization occurred in Early Cretaceous, and formed in lithospheric thining settings in East China. Based on summarizing available isotope ages, it was suggested that a significant molybdenum minearalization related to magmatism occured at Cretaceous in the south segment of Greater Xing’an Mountains, besides Pb, Zn, Ag, Cu and Fe mineralization. The molybdenum mineralization related to Cretaceous granite porphyry will be an important prospecting target.

Key words: zircon SHRIMP U-Pb dating, porphyry molybdenum deposit, Xilamulun molybdenum metallogenic belt, south segment of Greater Xing’an Mountains