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Isotope chronology and geochemistry of the Lower Carboniferous granitein Xilinhot, Inner Mongolia, China

Wenxiao Zhou*1,Xiaocheng Zhao**1, Jiali Xu2,Dong Fu3, Bo Huang3,Menchun Ge3
1. Institute of Geological Survey, China University of Geosciences, Hubei Wuhan 430074, China;2. School of Environmental Studies, China University of Geosciences, Hubei Wuhan 430074, China;3. Faculty of Earth Sciences, China University of Geosciences, Hubei Wuhan 430074, China

Geochronological and geochemical analyses were performed on K-feldspar granites and monzonitic granites from the Xilinhot area, Inner Mongolia (China). Zircon U-Pb ages indicate that the two types granites were emplaced during the Lower Carboniferous. The K-feldspar granites (332 Ma) have the typical A-type granite characteristics of a post-collision setting. The monzonitic granites have an emplacement age of 323 Ma. ZirconεHf(t)values of the former range from +12.8 to +14.2, with an average TDM2of 453 Ma. The latter have lower ZirconεHf(t) values, ranging from +5.4 to +10.7, with an average TDM2of 798 Ma. The strong, positiveεHf(t)values of the zircon indicate that both sets of samples are from a juvenile crust formed in an oceanic crust subduction stage, although the monzonitic granite may have undergone a hybridization of crustal materials. These results indicate a younger post orogenic event. The Paleo-Asian Ocean had closed before the Early Carboniferous and the Xilinhot area started its post-orogenic evolution with an extensional tectonic environment during the Early Carboniferous.

Keywords:Lower Carboniferous granite, Paleo-Asian Ocean, Lu-Hf isotope, Xilin Hot, Inner Mongolia

DOI:
10.1007/s12583-017-0942-2
CLC number:
U469.72
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