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Exhumation of Neogene gneiss domes between oblique crustal boundaries in south Karakorum (northwest Himalaya, Pakistan)

Mahéo, G. and Pêcher, A. and Guillot, S. and Rolland, Y. and Delacourt, C. (2004) Exhumation of Neogene gneiss domes between oblique crustal boundaries in south Karakorum (northwest Himalaya, Pakistan). In: Gneiss Domes in Orogeny. Special papers (Geological Society of America). No.380. Geological Society of America , Boulder, CO, pp. 141-154. ISBN 9780813723808.

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In southeast Karakorum (northwest Himalaya, Pakistan), kilometric size migmatitic domes were exhumed in a context of north-south shortening during Neogene times. The domes are characterized by a conical shape, and ductile deformation criteria indicate both radial expansion and extrusion of the migmatitic core relative to the surrounding gneisses. Most of the domes are aligned along the dextral, strike-slip Shigar fault that is parallel to the N130°E Karakorum fault. Along the Shigar fault, exhumation of the domes is mainly vertical with a slight dextral component. We propose that the high temperature exhumation of the domes is due to diapiric ascent of the molten mid-crust helped by the compressive regime. The localization of the initial diapir was controlled by crustal-scale vertical structures parallel to the Karakorum fault. The later stage of exhumation in mid to low temperature conditions was related to the uplift and erosion of the whole southeastern Karakorum by crustal-scale east-west folding. In south Tibet, the westward prolongation of south Karakorum, Neogene crustal melting is also supported by geophysical data and volcanism, but mid-crustal rocks have not been exhumed. This difference between the amount of exhumation in south Karakorum and south Tibet could be related to the transpressive context of south Karakorum inducing a strain partitioning between the N130°E faults and east-west folding. Such partitioning produces heterogeneous uplift in this area. Moreover, zones of rapid uplift rate are associated with erosion due to the high incision rate of the large Shyok and Braldu rivers and the large Biafo-Hispar and Concordia glaciers in south Karakorum.

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Guillot, S.0000-0002-6449-106X
Additional Information:© 2004 Geological Society of America. Accepted 8 April 2004. This study was supported by the INSU-CNRS program “Intérieur de la Terre" and by the French Foreign Ministry. The Geosciences Laboratory of Islamabad (Pakistan) is thanked for field assistance. We are grateful to Nicolas Arnaud, Joseph Barraud, Ken Farley, Lindsey Hedges, Robin Lacassin, Jean-Marc Lardeaux, and Philippe Herve Leloup for comments and discussion.
Funding AgencyGrant Number
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
French Foreign MinistryUNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Series Name:Special papers (Geological Society of America)
Issue or Number:380
Record Number:CaltechAUTHORS:20150206-130627964
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Official Citation:Gneiss Domes and Orogeny: Case Studies: G. Mahéo, A. Pêcher, S. Guillot, Y. Rolland, and C. Delacourt Exhumation of Neogene gneiss domes between oblique crustal boundaries in south Karakorum (northwest Himalaya, Pakistan) Geological Society of America Special Papers, 2004, 380, p. 141-154, doi:10.1130/0-8137-2380-9.141
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54490
Deposited By: Tony Diaz
Deposited On:06 Feb 2015 21:18
Last Modified:10 Nov 2021 20:34

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