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Sensitivity analysis of numerical scaled models of fold-and-thrust belts to granular material cohesion variation and comparison with analogue experiments
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.ORCID iD: 0000-0003-1744-7004
Department of Geology, University of Toronto, Canada .
Department of Geology, University of Toronto, Canada M5S 3B1 c School of Geosciences, Monash University, Melbourne, Australia.
2012 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 526-529, 196-206 p.Article in journal (Refereed) Published
Abstract [en]

Scaled analog and numerical brittle–viscous shortening models are employed to evaluate how fold–thrust structures evolve with changes in the cohesion of brittle materials, a rather poorly constrained physical parameter at this scale of experiment. The shortening models are characterized by various styles of shear zones and features resembling pop-up structures. The kinematics, geometry, and number of these structures are controlled by the viscous detachment layers in the models; the finite deformation of the model wedges is fundamentally different in model sets with one or two viscous layers. We demonstrate that the structural evolution of the numerical models is very sensitive to small changes in cohesion value. This is especially pronounced in the experiments that incorporate two weak viscous layers. The overall deformation of the numerical models is most similar to analog models when cohesion values are 70–80 Pa.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 526-529, 196-206 p.
Keyword [en]
Cohesion; Brittle–viscous; Analog modeling; Numerical modeling; Fold-and-thrust belts
National Category
Earth and Related Environmental Sciences Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
URN: urn:nbn:se:uu:diva-142922DOI: 10.1016/j.tecto.2011.06.022ISI: 000302664100018OAI: oai:DiVA.org:uu-142922DiVA: diva2:388568
Available from: 2011-01-18 Created: 2011-01-18 Last updated: 2013-08-26Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0040195111002629

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