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Episodic accretion and strain partitioning in a model sand wedge
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
1992 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 202, no 2-4, 319-333 p.Article in journal (Refereed) Published
Abstract [en]

We model led thrust wedge accretion and deformation partitioning in a passively layered sand, detached and shortened above a smooth rigid decollement. The thrust wedge accretes in piggyback style during forward advance of a rear wall. The passively layered sand accommodates the shortening penetratively, by kinking/ramp folding, and by imbrication. In single layers, the style of compression changes with time and/or stratigraphic position within the sand prism. Initial penetrative layer shortening, above a slipped zone of decollement is succeeded by formation of monoclinal or conjugate shear bands at temporary terminations of decollement. The shear bands subsequently narrow down and lock as thrust ramps. The model sand wedge accrets episodically rather than steadily. Episodicity is controlled by the stick/slip mode of decollement propagation, and by volume loss and compaction of the wedge material in response to convergence. This results in formation of a wedge with a convex-upwards cross-sectional topography

Place, publisher, year, edition, pages
1992. Vol. 202, no 2-4, 319-333 p.
Keyword [en]
ACCRETIONARY WEDGES; THRUST BELTS; SYSTEMS; EVOLUTION; MECHANICS; GEOMETRY
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-11364DOI: 10.1016/0040-1951(92)90117-OOAI: oai:DiVA.org:uu-11364DiVA: diva2:39132
Available from: 2007-09-11 Created: 2007-09-11 Last updated: 2013-06-04Bibliographically approved

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Mulugeta, G.Koyi, Hemin

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