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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/011817DIG17037
Fault-related folds in the southern Pyrenees
Josep Anton Muñoz1
1Geomodels Research Institute, Departament de Dinàmica de la Terra i de l’Oceà, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain; [email protected]
ABSTRACT
The fault-related folds observed in the south Pyrenean fold and thrust belt are hybrid structures with elements of detachment folding as well as elements of fault bend and fault propagation folding. Fanning growth strata in all the studied case studies indicate progressive limb rotation during deformation, mainly at their initial stages when fold growing mostly controlled the dispersal of syntectonic sediments as a result of higher uplift rates with respect to sedimentation rates. Break thrusts developed in the fold limb of the initial detachment folds to form fault propagation and fault bend geometries. Inversion folds developed at the rift margins. There the geometry of the folds as well as the brittle deformation patterns are controlled by the inherited fault systems, which are not symmetrical with respect to the fold axis. In the absence of previous structures, brittle patterns developed before or at the initial stages of folding by layer-parallel shortening preserving a symmetrical arrangement with respect to the fold axis.
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