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<datestamp>2018-01-11</datestamp>
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<title lang=en>Evolution of near-surface ramp-flat-ramp normal faults and implication during intramontane basin formation in the eastern Betic Cordillera (the Huercal-Overa Basin, SE Spain)</title>
<creator>Pedrera, Antonio</creator>
<creator>Galindo-Zaldivar, Jesus</creator>
<creator>Lamas, Francisco</creator>
<creator>RUIZ-CONSTAN, Ana</creator>
<contributor>Instituto Geológico y Minero de España [Granada] ; Instituto Geológico y Minero de España (IGME)</contributor>
<contributor>Departamento de Geodinámica, Universidad de Granada ; Université du Québec</contributor>
<contributor>Departamento de Ingeniería Civil, Universidad de Granada ; Université du Québec</contributor>
<contributor>Manteau et Interfaces; dynamique de la lithosphère ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0278-7407</source>
<source>Tectonics</source>
<publisher>American Geophysical Union (AGU)</publisher>
<identifier>hal-00750352</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00750352</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00750352</source>
<source>Tectonics, American Geophysical Union (AGU), 2012, 31, pp.TC4024. 〈10.1029/2012TC003130〉</source>
<identifier>DOI : 10.1029/2012TC003130</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1029/2012TC003130</relation>
<language>en</language>
<subject lang=en>Betic Cordillera</subject>
<subject lang=en>back-rotation</subject>
<subject lang=en>extensional folding</subject>
<subject lang=en>low-angle normal faults</subject>
<subject lang=en>riedel</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>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.</description>
<date>2012-08-23</date>
</dc>
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