[R6-04] Petrogenesis of the Khangai granitoids, central Mongolia: Implications for the crustal generation | 2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

Sep 15 - Sep 19, 2021Online

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2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

Sep 15 - Sep 19, 2021Online

[R6-04]Petrogenesis of the Khangai granitoids, central Mongolia: Implications for the crustal generation

*Dolzodmaa Boldbaatar¹, Yasuhito Osanai¹, Nobuhiko Nakano¹, Atsushi Kamei², Tatsuro Adachi¹(1. Kyushu Univ, 2. Shimane Univ)

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Keywords:

central Mongolia,granitoid,whole-rock Sr–Nd isotopes,Assimilation fractional crystallization (AFC) process

Newly obtained Sr–Nd isotopic data of 267–248 Ma granitoids have a low initial ⁸⁷Sr/⁸⁶Sr ratios between 0.7062 and 0.7283 and characterized by ε_Nd(T) values of -2.13 ~ +1.11 suggests that granitoids may have been derived from a source composed of juvenile material involving AFC processes whereas 238–237 Ma granitoids have high initial ⁸⁷Sr/⁸⁶Sr ratios between 0.7128 and 0.7576 and show ε_Nd(T) values of -1.68 ~ -1.52 suggests that the granitoids may be formed by AFC processes with the interaction between lower crust derived magma and meta-sedimentary rocks.

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