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Thermal-mechanical modeling of salt-based mountain belts with pre-existing basement faults: application to the Zagros fold and thrust belt, southwest Iran
Hans Ramberg Tectonic Laboratory, Department of Earth Sciences, Uppsala University, Uppsala, Sweden; Department of Earth Sciences, University of Toronto, Toronto, ON, Canada.ORCID iD: 0000-0003-1744-7004
Department of Earth Sciences, University of Toronto, Toronto, ON, Canada.
School of Geosciences, Monash University Victoria, Melbourne, Australia.
Hans Ramberg Tectonic Laboratory, Department of Earth Sciences, Uppsala University, Uppsala, Sweden.
2013 (English)In: Tectonics, ISSN 0278-7407, E-ISSN 1944-9194, Vol. 32, no 5, 1212-1226 p.Article in journal (Refereed) Published
Abstract [en]

Two-dimensional thermal-mechanical models of thick-skinned, salt-based fold and thrust belts,  such as the Zagros, SW Iran, are used to address: 1) the degree of deformation and decoupling between cover and basement rocks due to the presence of a weak salt detachment; 2) the reactivation potential of pre-existing basement normal faults due to brittle or ductile behavior of the lower crust (as related to cold or hot geothermal gradients); and 3) variations in deformation style and strain distribution. The geometry and kinematics of the orogenic wedge and the activity of pre-existing basement faults are strongly influenced by the geothermal gradient (defined by the Moho temperature, MT) and basement rheology. We infer that the MT plays a major role in how the lower and upper crust transfer deformation towards the foreland. In relatively hot geotherm models (MT = 600°C at 36 km depth), the lowermost basement deforms in a ductile fashion while the uppermost basement underlying the sedimentary cover deforms by folding, thrusting, and displacements along pre-existing basement faults. In these models, cover units above the salt detachment occur within a less deformed, wide plateau in the hinterland. In relatively cold geotherm models (MT = 400°C at 36 km depth), deformation is mainly restricted to basement imbricate thrusts that form within the orogenic hinterland. Detachment folding, thrusting and gravity gliding occur within cover sediments above uplifted basement blocks. Gravity gliding contributes to a larger amount of shortening in the cover compared to the basement.

Place, publisher, year, edition, pages
2013. Vol. 32, no 5, 1212-1226 p.
Keyword [en]
Thermal-mechanical models, Thick-skinned deformation, Salt detachment, Basement faults, Zagros fold and thrust belt
National Category
Geology Geophysics
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
URN: urn:nbn:se:hig:diva-24995DOI: 10.1002/tect.20075ISI: 000327305800010Scopus ID: 2-s2.0-84884879002OAI: oai:DiVA.org:hig-24995DiVA: diva2:1134590
Available from: 2013-08-02 Created: 2017-08-21 Last updated: 2017-08-21Bibliographically approved

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