Constraining different metamorphic and igneous events in Higher-Himalayan Crystalline rocks, Bhagirathi Valley, India from U-Pb zircon geochronological data

Abstract

We report the U-Pb zircon ages from augen gneiss and associated granite and leucogranites from Higher Himalayan Crystalline rocks, Bhagirathi Valley, Garhwal Himalaya, India. The age data reveals a Cambro-Ordovician high-grade metamorphic event and coeval felsic magmatism indicating the pre-Himalayan history. The garnet-bearing leucogranite veins intruding the augen gneiss shows a possible melting of source rock and subsequent garnet overgrowth and concomitant zircon growth at early Miocene age.