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Geochronology of Intrusive Rocks and Associated Ores of the Gaogangshan Porphyry Molybdenum Deposit in Heilongjiang Province

ZHANG Yong-mei;GU Xue-xiang;LIU Rui-ping;GAO Hai-jun;SU Yu;ZHENG Luo;GU Feng-hua;School of Earth Sciences and Resources,China University of Geosciences(Beijing);State KeyLaboratory of Geological Processes and Mineral Resources,China University of Geosciences(Beijing);Nonferrous Geological Prospecting Research Institute of Heilongjiang Province;  
The Gaogangshan deposit is the first discovered Early Triassic porphyry molybdenum deposit in the Xiaoxing'anling-Zhangguangcailing metallogenic belt.Studies on the timing of the intrusive rocks and mineralization provide a significant implication in better understanding of regional tectonic evolution and ore prospecting.LA-ICP-MS U-Pb dating of zircon in gneissic granodiorite gave a weighted average age of 459.8±2.7 Ma,indicating its emplacement in the Middle Ordovician during the westward subduction of the ocean crust under the Songnen-Zhangguangcailing microplate.Dating of zircon in granitic porphyry yielded a weighted average age of 259.9±2.0Ma,corresponding to the Late Permian collision between Jiamusi-Mongolia block and the eastern segment of the northern margin of the North China Plate.Re-Os dating of molybdenum ore gave an isochron age of 250.2±1.4Ma and a weighted average age of 247±6Ma,consistent with the emplacing age of granitic porphyry.
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