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Geological Society, London, Special Publications; 2006; v. 268; p. 201-219;
DOI: 10.1144/GSL.SP.2006.268.01.09
© 2006 Geological Society of London

Modeling Channel Flow and Ductile Extrusion Processes

Ductile extrusion in continental collision zones: ambiguities in the definition of channel flow and its identification in ancient orogens

R. R. Jones1,2, R. E. Holdsworth3, M. Hand4 & B. Goscombe4,5

1 Geospatial Research Ltd, Department of Earth Sciences, University of Durham, DH1 3LE, UK r.r.jones{at}durham.ac.uk
2 e-Science Research Institute, University of Durham, DH1 3LE, UK
3 Reactivation Research Group, Department of Earth Sciences, University of Durham, DH1 3LE, UK
4 Continental Evolution Research Group, Geology and Geophysics, University of Adelaide, 5005, Australia
5 Northern Territory Geological Survey, PO Box 8760, Alice Springs, 0871 NT, Australia

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.





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L. Godin, D. Grujic, R. D. Law, and M. P. Searle
Channel flow, ductile extrusion and exhumation in continental collision zones: an introduction
Geological Society, London, Special Publications, 2006; 268: 1 - 23.
[Abstract] [PDF]