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    BAO Qing-zhong, ZHANG Chang-jie, WU Zhi-li, WANG Hong, LI Wei, SANG Jia-he, LIU Yong-sheng. Zircon SHRIMP U-Pb dating of granitoids in a Late Paleozoic rift area, southeastern Inner Mongolia, and its implications[J]. GEOLOGY IN CHINA, 2007, 34(5): 790-798.
    Citation: BAO Qing-zhong, ZHANG Chang-jie, WU Zhi-li, WANG Hong, LI Wei, SANG Jia-he, LIU Yong-sheng. Zircon SHRIMP U-Pb dating of granitoids in a Late Paleozoic rift area, southeastern Inner Mongolia, and its implications[J]. GEOLOGY IN CHINA, 2007, 34(5): 790-798.

    Zircon SHRIMP U-Pb dating of granitoids in a Late Paleozoic rift area, southeastern Inner Mongolia, and its implications

    • Abstract:The major granitoid rocks in a Late Paleozoic rift area, southeastern Inner Mongolia, are quartz diorite, tonalite, granodiorite, monzogranite and syenogranite. SHRIMP zircon U-Pb dating of the quartz diorite yielded ages of 313±5-323±4 Ma, indicating a Late Carboniferous age. Both the Qianjinchang and Daqên monzogranite plutons are intruded into paralic clastic rocks of the Permian Shoushangou Formation (P1ss) with a clear intrusive contact relationship. The SHRIMP U-Pb zircon ages for the two plutons are 280.8±3.6 Ma and 281.5±0.5 Ma respectively, indicating a late Early Permian age. The Ulan Tolgoi syenogranite has an age of 259 Ma and the Yangjiaolin Gol monzogranite has U-Pb ages of 246-216 Ma, suggesting that another intrusion peak occurred during the Late Permian-Triassic. There were three intrusion peaks in the Carboniferous-Permian (partly Triassic) rifting period, i.e. the Late Carboniferous quartz diorite intrusion peak, Early Permian tonalite-monzogranite intrusion peak and Late Permian monzogranite-syenogranite intrusion peak.
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