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https://hdl.handle.net/2440/49952
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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 2041-4927 |
Editor: | Law, R.D. Searle, M.P. Godin, L. |
Statement of Responsibility: | 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 |
Published version: | http://sp.lyellcollection.org/cgi/content/abstract/268/1/201 |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications Environment Institute publications |
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