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Granites of the Thien Ke pluton that are exposed in the Tam Dao region are of sub-alkaline affinity, belong to the high-K calc-alkaline series, and display typical features of S-type granite. The rocks have high ASI values of 1.14-1.41 and are characterized by high initial 87 Sr/ 86 Sr ratios (0.7264-0.7270) and low ε Nd (456 Ma) values (−6.5 to −8.4). All of these characteristics, combined with~1.8 Ga T DM model ages and low Mg# of 13-22, suggest an origin in the partial melting of crustaldoi:10.2465/jmps.131203 fatcat:lnycsxepm5clvhslyfmwr5ugmi