Abstract
High-pressure (HP) granulites exposed within the eastern Himalayan syntaxis are dominantly felsic rocks. They were displaced southward over the Pei sequence by the NW-dipping Upper Thrust. Twenty-three SHRIMP U/Pb analyses of zircons from one HP sample demonstrate that this rock was derived from Proterozoic sedimentary rocks that underwent high-temperature metamorphism or partial melting to form granitoids or paragneisses at about 500 Ma. During Oligocene collision between India and Asia, these crystalline rocks were buried beneath south Tibet, recrystallizing to form HP felsic granulites at 30-33 Ma, with a metamorphic retrogression at about 23 Ma. Evidently the south Tibetan crust was thickened, and then uplifted at this time.
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