Evolution of the Trans-Himalayan Ladakh Arc, Geochemical and Geochronological Constraints

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Publication Date

Summer 7-15-2019


The Indus-Tsangpo Suture zone (ITSZ) is considered the collision zone between the Indian and Eurasian plates. Most workers suggest the Himalayan collision occurred between 50 Ma and 45 Ma. New U-Pb zircon data indicate that this switch occurred between 31 Ma and 18 Ma. The collision might be a series of collisionaccretion events from 70 Ma to 30 Ma. The upright folding took place at a later time, i.e. mid-Miocene or younger. We also present Argon Isotope data on erosion from the Ladakh Batholith. U-Pb data on detrital zircon from the Karakorum Range indicates presence of Gondwanic elements considerably north of the Himalayas. These data open a new debate: Where does India end and Eurasia begin?

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Professor Talat Ahmad is Vice Chancellor of the University of Kashmir and a world-recognized geologist. His research activities span geochemical isotopic, and geochronogic studies, especially focused on the Himalayas and the Central Indian Tectonic Zone. He is a Fellow of the Indian National Science Academy of Sciences and the National Academy of Sciences, India. He has published about 100 research papers and supervised 27 PhD students.