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Sm-Nd age dating of high-pressure granulites and amphibolite from Sanggan area, North China craton

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Chinese Science Bulletin

Abstract

The high pressure (HP) metamorphic age has been dated to HP rocks from the Sanggan area, North China craton. We have got garnet+whole rock isochron ages of (1 842±38) Ma for HP granulite, and (1 856 ±26) Ma for HP amphibolite. The Sm-Nd whole rock isochron of HP granulites give out an age of (1870±150) Ma with Nd depleted mantle model age of (2402–2482) Ma. Considering the Nd isotope homogenization during the peak metamorphism of the HP granulite, Sm-Nd closure temperature and the retention of Nd isotopic memory in garnets partially broken down during decompression, all these isochron ages are thought to be HP metamorphic age. Furthermore, we proposed that the HP metamorphism took place at the end of Paleoproterozoic during the large-scale collision and assembly of the North China craton.

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Authors and Affiliations

  1. Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029, Beijing, China

    Jinghui Guo & Mingguo Zhai

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  1. Jinghui Guo
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Guo, J., Zhai, M. Sm-Nd age dating of high-pressure granulites and amphibolite from Sanggan area, North China craton. Chin.Sci.Bull. 46, 106–111 (2001). https://doi.org/10.1007/BF03187002

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  • DOI: https://doi.org/10.1007/BF03187002

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