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Three-dimensional geometry of piggyback thrusting
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology. (Tectonics and Geodynamics)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology. (Tectonics and Geodynamics)
1987 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 15, no 11, 1052-1056 p.Article in journal (Refereed) Published
Abstract [en]

The three-dimensional geometry and kinematics of piggyback stacks of imbricate thrust sheets are illustrated and discussed using a single model shortened in a squeeze box. Strike-parallel geometric elements simulated include lateral ramps, eyed sheath folds, splays, and thrust/thrust interference. Fine details of these structures were exposed by eroding a shortened wedge of sand using a newly developed vacuum-eroding technique. A kinematic analysis of the model shows a stepwise increase in imbricate thrust spacing and/or a decrease in rate of nucleation of imbricate thrusts in the direction of thrust transport. Despite the steady forward advance of a rear wall, the piggyback wedge accreted episodically, recording different strain domains in longitudinal cross sections. Strain partitioning in single layers by bed-length balancing showed an increase in layer shortening with volume loss and a corresponding decrease in imbricate thrusting and ramp folding with depth.

Place, publisher, year, edition, pages
Geological Society of America , 1987. Vol. 15, no 11, 1052-1056 p.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-11373DOI: 10.1130/0091-7613(1987)​15<1052:TGAKOE>​2.0.CO;2OAI: oai:DiVA.org:uu-11373DiVA: diva2:39141
Available from: 2007-09-11 Created: 2007-09-11 Last updated: 2017-12-11Bibliographically approved

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Mulugeta, GeneneKoyi, Hemin

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