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Numerical models of ductile rebound of crustal roots beneath mountain belts
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
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1999 (English)In: Geophysical Journal International, ISSN 0956-540X, E-ISSN 1365-246X, Vol. 139, no 2, 556-562 p.Article in journal (Other academic) Published
Abstract [en]

Crustal roots formed beneath mountain belts are gravitationally unstable structures, which rebound when the lateral forces that created them cease or decrease significantly relative to gravity. Crustal roots do not rebound as a rigid body, but undergo intensive internal deformation during their rebound and cause intensive deformation within the ductile lower crust. 2-D numerical models are used to investigate the style and intensity of this deformation and the role that the viscosities of the upper crust and mantle lithosphere play in the process of root rebound. Numerical models of root rebound show three main features which may be of general application: first, with a low-viscosity lower crust, the rheology of the mantle lithosphere governs the rate of root rebound; second, the amount of dynamic uplift caused by root rebound depends strongly on the rheologies of both the upper crust and mantle lithosphere; and third, redistribution of the rebounding root mass causes pure and simple shear within the lower crust and produces subhorizontal planar fabrics which may give the lower crust its reflective character on many seismic images.

Place, publisher, year, edition, pages
Blackwell Publishing, 1999. Vol. 139, no 2, 556-562 p.
Keyword [en]
numerical models; root rebound; Western Gneiss complex; SEISMIC-REFLECTION; COLLISION ZONE; DEEP-STRUCTURE; MIDDLE URALS; EXTENSION; MECHANISM; EVOLUTION; REGION
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-27700DOI: 10.1046/j.1365-246X.1999.00978.xOAI: oai:DiVA.org:uu-27700DiVA: diva2:55596
Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2017-12-07Bibliographically approved

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Koyi, HeminTalbot, Christopher J.Juhlin, Christopher

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