Journal
TECTONOPHYSICS
Volume 495, Issue 3-4, Pages 171-183Publisher
ELSEVIER
DOI: 10.1016/j.tecto.2010.09.010
Keywords
Western Himalaya; Ladakh batholith; Indus Molasse Group; India-Asia collision; U-Pb zircon geochronology
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Funding
- NERC (UK)
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The Ladakh batholith is part of the >2500 km long Trans-himalayan batholith that forms the southern margin of the Asian plate and is unconformably overlain by the post-collision Indus Molasse Group sedimentary rocks. We present new U-Pb ID-TIMS zircon ages from a host hornblende-bearing granodiorite (57.7 +/- 0.2 Ma) and a later intrusive leucocratic granite dyke (47.1 +/- 0.1 Ma) from the Ladakh batholith at Chumathang in northeast Ladakh, India. Subduction-related granodioritic magmatism in eastern Ladakh is dominantly of late Paleocene-early Eocene age. The age of the Chumathang dyke gives a maximum age constraint on Indus Molasse Group basin formation along the northern margin of the Indus Suture Zone and a minimum age constraint on the India-Asia collision. Together with the age of youngest marine sedimentary rocks in the suture zone (Nummulitic Limestone; 50.5 Ma) we propose that by late Ypresian-early Lutetian (early Eocene) time, the two continents had collided, sedimentation in the suture zone became purely continental and subduction-related igneous intrusions had ceased. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
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