Geochronology of the Xingshan molybdenum deposit,Jilin Province,NE China,and its Hf isotope significance |
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| Institution: | 1. College of Earth Sciences, Jilin University, Changchun 130061, China;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong;1. Key Laboratory of Orogen and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China;2. The Institute for Geoscience Research, Department of Applied Geology, Curtin University, PO Box U1987, Perth, Western Australia 6845, Australia;3. College of Earth Sciences, Jilin University, Changchun 130061, China;4. Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, School of Earth Science and Resources, Chang''an University, Xi''an 710054, China;5. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | The Xingshan porphyry Mo deposit is located in the Lesser Xing’an Range–Zhangguangcai Range metallogenic belt, NE China. Mineralization occurred in granodioritic porphyry and monzogranite, which have zircon U–Pb ages of 171.7 ± 2.2 Ma and 170.9 ± 4.6 Ma, respectively. Molybdenite Re–Os dating indicates that Mo mineralization occurred at 167.3 ± 2.5 Ma. These geochronological data suggest that the magmatic and hydrothermal activities of the Xingshan Mo deposit happened during the Middle Jurassic in Mesozoic. Positive εHf values (6.2–11.6) and young TDM2 (473–826 Ma) of the monzogranite (XS-3) and granodioritic porphyry (XS-5) indicate that the source materials of Xingshan ore-bearing rocks are the juvenile crust, which mainly accreted on the Songnen block during the Meso-Neoproterozoic. Xingshan porphyry Mo deposits resulted from the magmatism and tectonism induced by the subduction of Paleo-Pacific Ocean. |
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| Keywords: | Porphyry Mo deposit Zircon U–Pb dating Molybdenite Re–Os dating Hf isotope NE China |
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