The effects of basement ramps on deformation of the Prebetics (Spain): A combined field and analogue modelling study

M.M. ter Borgh, R. Oldenhuis, C. Biermann, J.H.W. Smit, D. Sokoutis

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    In this study we test whether pre-existing basement faults control deformation in the Prebetic zones of the Betic Cordillera. We focus on an area in the northern part of the Prebetics which is dominated by a transpressional fault system consisting of a NNE-SSW striking fault zone and E-W striking small-scale thrusts. Field observations show that both sets of faults formed in a regional NW-SE to NNW-SSE directed compressional stress field during the Miocene. We propose that the faults formed on top of a basement containing basement ramps overlain by a décollement of Late Triassic evaporites and clays. These basement ramps have either an E-W or NNE-SSW orientation and result from extensional faulting prior to the compressional phase. The style of faulting in the overlying sediments is controlled by the variation in orientation of the pre-existing basement ramps in a uniform stress field. Where the ramps have an E-W orientation small-scale thrusting and folding occurs, where the ramps are oriented NNE-SSW the fault zone acts as an oblique-slip fault. The model was tested by analogue tectonic experiments incorporating a ductile layer, representing the décollement, overlain by a brittle layer representing the overlying sediments. The pre-existing basement ramps were represented by rigid material. The close similarity between the structures produced during the analogue experiments and those observed in the field suggests that pre-existing basement faults exert a major role on deformation of the Prebetics. © 2010 Elsevier B.V.
    Original languageEnglish
    Pages (from-to)62-74
    JournalTectonophysics
    Volume502
    DOIs
    Publication statusPublished - 2011

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