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Recent mapping in the Gangdese block has revealed many leucogranites that are similar to those in the High Himalaya. These leucogranites formed at ∼140 Ma as indicated by monazite Th-Pb ion-microprobe dating and cooled at ∼130 Ma as indicated by muscovite40Ar/39Ar dating. In conjunction with previous structural and paleogeographic studies, the new data indicate that the Gangdese block underwent crustal...
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