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Formation of orogen-perpendicular thrusts due to mechanical contrasts in the basal décollement in the Central External Sierras (Southern Pyrenees, Spain)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
2009 (English)In: Journal of Structural Geology, ISSN 0191-8141, Vol. 31, no 5, 523-539 p.Article in journal (Refereed) Published
Abstract [en]

Two series of analogue models are used to explore the effect of ductile-frictional contrasts of the basal decollement on the   development of oblique and transverse structures during thin-skinned   shortening. These models simulate the evolution of the Central External   Sierras (CES; Southern Pyrenees, Spain), which constitute the frontal   emerging part of the southernmost Pyrenean thrust. The CES are characterised by the presence of N-S to NW-SE anticlines, perpendicular to the Pyrenean structural trend and developed in the hanging-wall of   the thrust system. They detach on unevenly distributed Triassic   materials (evaporitic-dolomitic interfingering). The models simulated   the effect of adjacent ductile versus frictional decollements during   shortening. Model Series A tests the thickness ratio between overburden   and the ductile layer, whereas model Series B tests the width   (perpendicular to the shortening direction) of frictional decollement. Model results confirms that deformation reaches further in areas detached on a ductile layer whereas above frictional decollement areas,   shortening is accommodated by additional uplift and penetrative strain. This replicates the structural style of the CES: higher structural   relief of N-S anticlines with regard to orogen-parallel structures, absence of a representative ductile decollement in the core, plunging   towards the hinterland and foreland-side closure not thrusted by the South Pyrenean thrust.

Place, publisher, year, edition, pages
2009. Vol. 31, no 5, 523-539 p.
Keyword [en]
Analogue modelling, External Sierras, Southern Pyrenees, Pico del Aguila, Detachment, Ductile deformation, Brittle deformation
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-105497DOI: 10.1016/j.jsg.2009.03.011ISI: 000267182900007OAI: oai:DiVA.org:uu-105497DiVA: diva2:221392
Available from: 2009-06-04 Created: 2009-06-04 Last updated: 2010-07-20Bibliographically approved

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