Nd-Pb Isotopic Composition Characteristics and Geological Significances of Granitoids with Different Ages in Inner Mongolia

Abstract

Abstract:

Inner Mongolia connects two different tectonic units with distinct evolution histories,i. e. the Xing-Meng Orogenic Belt and the North China Block together. Through studies of the Sm-Nd and Pb isotopes of 30 granitoids with different ages from various locations, the Nd and Pb isotopic differences of the XingMeng Orogen and the North China Block are discussed to reveal their evolution processes. The Nd model ages of granitoids in the North China Block are pre-Mesoproterozoic. The Nd isotopic characters show three crustal accretion stages of the North China Block during the Archean, Late Paleozoic, and Early Mesozoic (Triassic). The Nd model ages of granitoids in the Xing-Meng Orogen are after Paleoproterozoic, which focus in Neoproterozoic and Early Paleozoic. The Nd isotopic features indicate a continuous injection of mantle material from Neoproterozoic to Mesozoic. The initial Pb isotope ratios of granitoids in the XingMeng Orogen are generally higher than that of the North China Block. In the North China Block in Inner Mongolia, the granitoids that crystalled in Late Paleozoic could contain material from the Xing-Meng Orogenic Belt directly or indirectly, while in Mesozoic, the North China Block and the Xing-Meng Orogen were jointed together and evolved as a whole.

Key words: Inner Mongolia, the XingMeng Orogenic Belt, granitoid, Nd isotope, Pb isotope

CLC Number:

P597

LI Da-Peng, CHEN Yue-Long, WANG Zhong, LIU Chang-Zheng. Nd-Pb Isotopic Composition Characteristics and Geological Significances of Granitoids with Different Ages in Inner Mongolia[J]. Geoscience, 2010, 24(5): 821-831.

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