10:15 AM - 10:30 AM
[R6-04] Petrogenesis of the Khangai granitoids, central Mongolia: Implications for the crustal generation
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 εNd(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 εNd(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.