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Effect of lateral thickness variation of an intermediate decollement on the propagation of deformation front in the Lurestan and Izeh zones of the Zagros fold-thrust belt, insights from analogue modeling
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
2014 (English)In: Journal of Structural Geology, ISSN 0191-8141, Vol. 65, 17-32 p.Article in journal (Refereed) Published
Abstract [en]

Although the role of various basal decollement levels on structural style and deformation propagation is well documented in many folded belts, the effect of lateral variation in intermediate decollements is poorly constrained. This work uses results of three scaled sand-box models shortened from one end to study the variation in structural development between areas with a ductile intermediate decollement and areas without (or with a thinner) intermediate decollement. Combined results of scaled models with field observations are used to argue that the presence of mechanically different intermediate decollement horizons within the Zagros stratigraphy has resulted in deformation partitioning between the Lurestan and Izeh zones. A thick intermediate decollement facilitates a faster propagation of deformation front and a lower taper in comparison with a thinner (or non-existing) intermediate decollement during compression. However, the effect of lateral thickness variation in the intermediate decollement on propagation of deformation is less profound than the effect of mechanical differences in basal decollements. 

Place, publisher, year, edition, pages
2014. Vol. 65, 17-32 p.
Keyword [en]
Zagros fold-thrust belt, Intermediate decollement, Analogue modeling, Deformation front
National Category
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
URN: urn:nbn:se:uu:diva-228947DOI: 10.1016/j.jsg.2014.03.004ISI: 000337778800002OAI: oai:DiVA.org:uu-228947DiVA: diva2:736902
Available from: 2014-08-11 Created: 2014-07-24 Last updated: 2015-01-08Bibliographically approved

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Koyi, Hemin
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