Mesozoic magmatism and metallogenesis associated with the destruction of the North China Craton: Evidence from U–Pb geochronology and stable isotope geochemistry of the Mujicun porphyry Cu–Mo deposit |
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| Institution: | 1. China University of Geosciences, 29 Xueyuan Road, Haidian District, Beijing, 100083, China;2. State Key Laboratory of Geological Processes and Mineral Resources, CUGB, Beijing 100083, China;3. Department of Geology, University of Toronto, 22 Russell Street, Toronto, Ontario, M5S 3B1, Canada;1. College of Earth Sciences, Jilin University, Changchun 130061, China;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong;3. The Laboratory Centre of Institute of Earth Sciences, China University of Geosciences, Beijing 100083, China;1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, PR China;2. No. 4 Geology Group, North China Geological Exploration Bureau, Qinghuangdao 066013, PR China;3. College of Resources, Shijiazhuang University of Economics, Shijiazhuang 050031, PR China;4. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, PR China;5. Faculty of Science, Kochi University, Kochi 780-8520, Japan;6. National Research Center for Geoanalysis, Beijing 100037, PR China;1. Institute of Geomechanics, Chinese Academy of Geological Sciences, MLR Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Beijing 100081, China;2. Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089-0740, USA |
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| Abstract: | The North China Craton (NCC) provides a classic example of lithospheric destruction and refertilization. The timing and duration of magmatism and related metallogenesis associated with the destruction process are pivotal to understanding the geodynamic controls. In this study, we present zircon U–Pb and Hf data, Re–Os ages, and He, Ar, Pb and S isotope data from the Mujicun porphyry Cu–Mo deposit in the northern Taihang Mountains within the Central Orogenic Belt of the NCC. We constrain the timing of magmatism as 144.1 ± 1.2 Ma from zircon U–Pb data on the diorite porphyry that hosts Cu–Mo mineralization. Another U–Pb age of 139.7 ± 1.4 Ma was obtained from an epidote skarn that is located in the contact zone between the porphyry and its wall rocks. These data and five Re–Os molybdenite ages that range from 142.7 ± 2.0 Ma to 138.5 ± 1.9 Ma suggest that magmatism and mineralization occurred in about five million year duration from ~ 143 Ma to ~ 138 Ma. The He, Ar, Pb and, Hf data suggest that magmatism involved recycled Neoarchean lower crustal components, with input of heat and volatiles from an upwelling mantle. The Mujicun porphyry and associated mineralization provide a typical example for magmatism and metallogeny associated with lithospheric thinning in the NCC. |
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