White, Lloyd; Ahmad, Talat; Lister, Gordon; Forster, Margaret; Ireland, Trevor
The switch from I- to S-type magmatism in the Trans-Himalayan Batholith is one of the criteria used to determine when India and Eurasia collided. We present new 238U/ 206Pb SHRIMP data from the Karakorum Batholith, NW India. Our results suggest that an I-type hornblende-biotite granodiorite was emplaced at 31.4 ± 0.4 Ma and crosscut by S-type granite dykes at 18.0 ± 0.4 Ma. We interpret these data to indicate that volatile-fluxed melting of a mantle wedge above an active subduction zone and/or...[Show more]
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