Evolution and dynamics of a fold-thrust belt: the Sulaiman Range of Pakistan

Reynolds, Kirsty and Copley, Alex and Hussain, Ekbal (2015) Evolution and dynamics of a fold-thrust belt: the Sulaiman Range of Pakistan. Geophysical Journal International, 201 (2). pp. 683-710. ISSN ISSN: 0956-540X, ESSN: 1365-246X DOI https://doi.org/10.1093/gji/ggv005

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Abstract

We present observations and models of the Sulaiman Range of western Pakistan that shed new light on the evolution and deformation of fold-thrust belts. Earthquake source inversions show that the seismic deformation in the range is concentrated in the thick pile of sediments overlying the underthrusting lithosphere of the Indian subcontinent. The slip vectors of the earthquakes vary in strike around the margin of the range, in tandem with the shape of the topography, suggesting that gravitational driving forces arising from the topography play an important role in governing the deformation of the region. Numerical models suggest that the active deformation, and the extreme plan-view curvature of the range, are governed by the presence of weak sediments in a pre-existing basin on the underthrusting Indian Plate. These sediments affect the stress-state in the over-riding mountain range and allow for the rapid propagation of the nose of the range and the development of extreme curvature and laterally varying surface gradients.

Item Type:	Article
Additional Information:	This article has been accepted for publication in Geophysical Journal International © The Authors 2015. Published by Oxford University Press on behalf of The Royal Astronomical Society.All rights reserved.
Uncontrolled Keywords:	2015AREP; IA69;
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics 08 - Green Open Access
Journal or Publication Title:	Geophysical Journal International
Volume:	201
Page Range:	pp. 683-710
Identification Number:	https://doi.org/10.1093/gji/ggv005
Depositing User:	Sarah Humbert
Date Deposited:	31 Jul 2015 17:34
Last Modified:	30 Aug 2015 02:27
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3426

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