Nd Isotopic Compositions of Basement Rocks, Granitoids and Basalts from Middle-Eastern Inner Mongolia: Implication for the Regional Crustal Evolution

Abstract

Abstract:

Twenty one samples，including basement rocks, granitoids and basalts from the west segment of the North China Craton and the Xing-Meng Orogen, Inner Mongolia were chosen to study their Nd isotopic compositions. Through the comparison of their Nd depleted mantle model ages, it is indicated that the Xing-Meng Orogen and North China Craton show overall different features. The Nd depleted mantle model ages of the rocks from the Xing-Meng Orogen are generally lower than those in the west segment of the North China Craton in Inner Mongolia. The Nd depleted mantle model ages of the Xilinhot Block are between the ones in the North China Craton and the Xing-Meng Orogen. The samples’t^_DM values indicate that the accretion of the North China Craton in Inner Mongolia primarily occurred before Mesoproterozoic; in contrast, the accretion of the Xing-Meng Orogen in Inner Mongolia predominantly began at Neoproterozoic. The evolution diagram of ε_Nd values with time from the north margin of the North China Craton suggests that both reworking of old crust and crustal accretion dominated the regional crust in Mesoproterozoic and Hercynian periods. The accretion rate of the Xing-Meng Orogen shows that its crustal accretion primarily occurred at 1,000-700 Ma and the later formed igneous rocks show the involvement of the old crustal components.

Key words: Inner Mongolia, the North China Craton, the Xing-Meng Orogen, Nd depleted mantle model age

CLC Number:

P588.1

WANG Zhong LI Da-Feng LIU Jin-Bao CHEN Yue-Long HOU Jing-Xie LI Wei PI Jiao-Hui LIN Yu. Nd Isotopic Compositions of Basement Rocks, Granitoids and Basalts from Middle-Eastern Inner Mongolia: Implication for the Regional Crustal Evolution[J]. Geoscience, 2008, 22(5): 715-723.

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