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FENG Li-xia, ZHANG Zhi-cheng, HAN Bao-fu, REN Rong, LI Jian-feng, SU Li. 2013: LA-ICP-MS zircon U-Pb ages of granitoids in Darhan Muminggan Joint Banner, Inner Mongolia, and their geological significance. Geological Bulletin of China, 32(11): 1737-1748.
Citation: FENG Li-xia, ZHANG Zhi-cheng, HAN Bao-fu, REN Rong, LI Jian-feng, SU Li. 2013: LA-ICP-MS zircon U-Pb ages of granitoids in Darhan Muminggan Joint Banner, Inner Mongolia, and their geological significance. Geological Bulletin of China, 32(11): 1737-1748.
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LA-ICP-MS zircon U-Pb ages of granitoids in Darhan Muminggan Joint Banner, Inner Mongolia, and their geological significance

  • Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education/School of Earth and Space Sciences,Peking University, Beijing 100871, China;2. Geological Lab Center, China University of Geosciences, Beijing 100083, China

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  • This paper reports four zircon U-Pb ages of granitoids in Darhan Muminggan Joint Banner, Inner Mongolia. Two granodiorite samples from Bater magmatic arc in the northern part and two granite samples from a single pluton in the southern part were dated by LA-ICP-MS zircon U-Pb method so as to define their emplacement ages and provide constraints on the subduction and collisional events of the Paleo-Asian Ocean in the central part of Inner Mongolia. The two granodiorite samples yielded zircon U-Pb ages of 468Ma±2Ma and 452Ma±3Ma, respectively, indicating that the southward subduction of the paleo-Asian ocean beneath the North China Craton started at least at 468Ma, which resulted in the formation of Bater Obo magmatic arc, and the two granite samples gave zircon U-Pb ages of 268Ma±2Ma and 264Ma±2Ma, respectively, which are within the range of pre-existing age data from the western pluton, although the tectonic setting of the Middle Permian plutonism in the southern part is still uncertain.
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