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Exhumation history of eastern Ladakh revealed by Ar-40/Ar-39 and fission-track ages: the Indus River-Tso Morari transect, NW Himalaya

Schlup, M. and Carter, Andrew and Cosca, M. and Steck, A. (2003) Exhumation history of eastern Ladakh revealed by Ar-40/Ar-39 and fission-track ages: the Indus River-Tso Morari transect, NW Himalaya. Journal of the Geological Society 160 (3), pp. 385-399. ISSN 0016-7649.

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Official URL: http://dx.doi.org/10.1144/0016-764902-084

Abstract

Fission-track and Ar-40/Ar-39 ages place time constraints on the exhumation of the North Himalayan nappe stack, the Indus Suture Zone and Molasse, and the Transhimalayan Batholith in eastern Ladakh (NW India). Results from this and previous studies on a north-south transect passing near Tso Morari Lake suggest that the SW-directed North Himalayan nappe stack (comprising the Mata, Tetraogal and Tso Morari nappes) was emplaced and metamorphosed by c. 50-45 Ma, and exhumed to moderately shallow depths (c. 10 km) by c. 45-40 Ma. From the mid-Eocene to the present, exhumation continued at a steady and slow rate except for the root zone of the Tso Morari nappe, which cooled faster than the rest of the nappe stack. Rapid cooling occurred at c. 20 Ma and is linked to brittle deformation along the normal Ribil-Zildat Fault concomitant with extrusion of the Crystalline nappe in the south. Data from the Indus Molasse suggest that sediments were still being deposited during the Miocene.

Item Type: Article
Additional Information: This material has been published in The Journal of the Geological Society, volume 160, issue 3 (May 2003), pages 385-399, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by The Geological Society of London.
Keyword(s) / Subject(s): Himalaya, eastern Ladakh, Ar-40/Ar-39, fission-track dating, exhumation, argon dating, North-West Himalaya, continental collision, geological transect, nappe structures, Tethys Himalaya, Indian Himalaya, Kangmar Dome, suture zone, fault zone, metamorphism
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Earth and Planetary Sciences
Depositing User: Administrator
Date Deposited: 14 Feb 2005
Last Modified: 17 Apr 2013 12:32
URI: http://eprints.bbk.ac.uk/id/eprint/77

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