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Numerical modeling of salt-based mountain belts with pre-existing basement faults: application to the Zagros fold- and thrust belt, southwest Iran
Uppsala University, Earth Sciences, Uppsala, Sweden; Department of Earth Sciences, University of Toronto, Toronto, Canada.
Department of Earth Sciences, University of Toronto, Toronto, Canada.
Department of Earth Sciences, University of Toronto, Toronto, Canada;School of Geosciences, Monash University, Melbourne, Australia.
Uppsala University, Earth Sciences, Uppsala, Sweden .
2013 (English)Conference paper, Oral presentation with published abstract (Refereed)
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 dueto the presence of a weak salt detachment; 2) the reactivation potential of pre-existing basement normal faults dueto brittle or ductile behavior of the lower crust (as related to cold or hot geothermal gradients); and 3) variations indeformation style and strain distribution. The geometry and kinematics of the orogenic wedge and the activity ofpre-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 transferdeformation towards the foreland. In relatively hot geotherm models (MT = 600C at 36 km depth), the lowermostbasement deforms in a ductile fashion while the uppermost basement underlying the sedimentary cover deformsby folding, thrusting, and displacements along pre-existing basement faults. In these models cover units abovethe salt detachment are less deformed in the hinterland. In relatively cold geotherm models (MT = 400C at 36km depth), deformation is mainly restricted to the hinterland of the models where basement imbricates form.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
EGU General Assembly , 2013.
Series
Geophysical Research Abstracts, 2013-1868-1
Keyword [en]
Thermal-mechanical models, Thick-skinned deformation, Salt detachment, Basement faults, Zagros fold- and thrust belt
National Category
Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
URN: urn:nbn:se:hig:diva-24998OAI: oai:DiVA.org:hig-24998DiVA: diva2:1134588
Conference
EGU General Assembly, 07–12 April 2013, Vienna, Austria
Available from: 2012-12-14 Created: 2017-08-21Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • sv-SE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • de-DE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf