Evolution of near-surface ramp-flat-ramp normal faults and implication during intramontane basin formation in the Eastern Betic Cordillera (the Huércal-Overa Basin, SE Spain)

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dc.contributor.author Pedrera Parias, Antonio
dc.contributor.author Galindo Zaldívar, Jesús
dc.contributor.author Lamas, Francisco
dc.contributor.author Ruiz Constán, Ana
dc.date.accessioned 2020-09-17T14:58:27Z
dc.date.available 2020-09-17T14:58:27Z
dc.date.issued 2012-08-23
dc.identifier.citation Tectonics, vol.31, n.4, 1-17 es_ES
dc.identifier.issn 1944-9194
dc.identifier.uri http://hdl.handle.net/20.500.12468/330
dc.description.abstract The nucleation, propagation, and associated folding of ramp‐flat‐ramp normal faults were analyzed from field examples developed in a brittle/ductile multilayer sequence of the Huércal‐Overa Basin (SE Spain). Gently dipping sandy silt layers, which display a low cohesive strength (C0 = 7 kPa, μ= 34°), favor the development of extensional detachments. A tectonic origin instead of a possible gravitational origin is supported by the perpendicularity between the paleoslope direction of the fluvial‐deltaic environment inferred from imbricated pebbles, and the senses of movement deduced from fault slicken‐lines. The link between high‐angle normal faults (HANFs) —formed at different levels in the layered sequence— with horizontal fault segments comes to develop ramp‐flat‐ramp normal faults with associated roll‐over in the hanging wall. Observed extensional duplexes are formed by parallel detachments connected through synthetic Riedel faults. These Riedel faults would produce the back‐rotation of the individual blocks (horses), i.e., extensional folding of the originally subhorizontal layers. There is no correlation between the analyzed ramp‐flat‐ramp normal faults, accommodating south‐southeastward extension during Serravallian‐lower Tortonian, and either the regional Alpujarride/Nevado‐Filabride west‐directed extensional shear zone or the top‐to‐the‐north detachments within Alpujarride units, which are clearly sealed by Serravallian‐lower Tortonian sediments. Therefore, the studied normal faults are restricted to the brittle/ductile multilayer fluvio/deltaic sequence and accommodate moderate late extension instead of belonging to a large crustal extensional system connected with a regional detachment at depth. Therefore, the basin formed in a moderate crustal thickness context where small and medium‐scale extensional systems were subordinate structures. These natural examples support the development of low‐angle normal faults at very shallow crustal levels in multilayer sequences with suitable rheological conditions. es_ES
dc.description.sponsorship Unidad de Granada, Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Departamento de Geodinámica, Universidad de Granada, España es_ES
dc.description.sponsorship Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas, España es_ES
dc.description.sponsorship Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada, España es_ES
dc.description.sponsorship Departamento de Ingeniería Civil, Universidad de Granada, España es_ES
dc.description.sponsorship Géosciences Montpellier, Centre National de la Recherche Scientifique, Francia es_ES
dc.description.sponsorship Géosciences Montpellier, Université Montpellier, Francia es_ES
dc.language.iso en es_ES
dc.publisher American Geophysical Union es_ES
dc.relation CSD2006-00041 es_ES
dc.relation CGL-2008-03474-E es_ES
dc.relation CGL2010-21048 es_ES
dc.relation CGL2008-0367-E/BTE es_ES
dc.rights Acceso abierto es_ES
dc.subject falla normal es_ES
dc.subject cuenca intramontañas es_ES
dc.subject Béticas es_ES
dc.subject Cuenca Huércal-Overa es_ES
dc.subject España es_ES
dc.title Evolution of near-surface ramp-flat-ramp normal faults and implication during intramontane basin formation in the Eastern Betic Cordillera (the Huércal-Overa Basin, SE Spain) es_ES
dc.type Postprint es_ES
dc.relation.publisherversion https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2012TC003130 es_ES
dc.description.funder Ministerio de Ciencia y Educación, España es_ES
dc.description.funder Junta de Andalucía, España es_ES
dc.identifier.doi https://doi.org/10.1029/2012TC003130 es_ES
dc.coverage.spatialStudy Cuenca de Huércal-Overa, Cordilleras Béticas, Almería, España es_ES


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