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Type: Journal article
Title: Ductile extrusion in continental collision zones: Ambiguities in the definition of channel flow and its identification in ancient orogens
Author: Jones, R.
Holdsworth, R.
Hand, M.
Goscombe, B.
Citation: Geological Society Special Publication, 2006; Issue 268(1):201-219
Publisher: Geological Society Publishing House
Issue Date: 2006
ISSN: 0305-8719
Editor: Law, R.D.
Searle, M.P.
Godin, L.
Statement of
R. R. Jones, R. E. Holdsworth, M. Hand and B. Goscombe
Abstract: Field characteristics of crustal extrusion zones include: high-grade metamorphism flanked by lower-grade rocks; broadly coeval flanking shear zones with opposing senses of shear; early ductile fabrics successively overprinted by semi-brittle and brittle structures; and localization of strain to give a more extensive deformation history within the extrusion zone relative to the flanking regions. Crustal extrusion, involving a combination of pure and simple shear, is a regular consequence of bulk orogenic thickening and contraction during continental collision. Extrusion can occur in response to different tectonic settings, and need not necessarily imply a driving force linked to mid-crustal channel flow. In most situations, field criteria alone are unlikely to be sufficient to determine the driving causes of extrusion. This is illustrated with examples from the Nanga Parbat-Haramosh Massif in the Pakistan Himalaya, and the Wing Pond Shear Zone in Newfoundland.
Rights: © 2006 Geological Society of London
DOI: 10.1144/GSL.SP.2006.268.01.09
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Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications
Environment Institute publications

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