Mountain front migration and drainage captures related to fault segment linkage and growth: The Polopos transpressive fault zone (southeastern Betics,SE Spain) |
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| Institution: | 1. Departamento de Geodinámica, Universidad del País Vasco, UPV/EHU, P.O. Box 644, E-48080 Bilbao, Spain;2. Servicio General de Geocronología y Geoquímica Isotópica — SGIker-IBERCRON, Universidad del País Vasco, UPV/EHU, P.O. Box 644, E-48080 Bilbao, Spain;3. Departamento de Mineralogía y Petrología, Universidad del País Vasco, UPV/EHU, P.O. Box 644, E-48080 Bilbao, Spain;4. Servicio General de Microscopía y Microanálisis de Materiales — SGIker, Universidad del País Vasco, UPV/EHU, P.O. Box 644, E-48080 Bilbao, Spain;1. School of Rural and Surveying Engineering, National Technical University of Athens (NTUA), Zografos, 15780 Athens, Greece;2. Departamento de Prehistoria y Arqueología, Universidad de Sevilla, 41004 Sevilla, Spain;3. Archaeometry Center, University of Ioannina, 451 10 Ioannina, Greece;4. Museo De La Ciudad De Carmona, 41410, Carmona, Sevilla, Spain;5. Greek Atomic Energy Commission, 153 41, Aghia Paraskevi, Athens, Greece |
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| Abstract: | The Polopos E–W- to ESE–WNW-oriented dextral-reverse fault zone is formed by the North Alhamilla reverse fault and the North and South Gafarillos dextral faults. It is a conjugate fault system of the sinistral NNE–SSW Palomares fault zone, active from the late most Tortonian (≈7 Ma) up to the late Pleistocene (≥70 ky) in the southeastern Betics. The helicoidal geometry of the fault zone permits to shift SE-directed movement along the South Cabrera reverse fault to NW-directed shortening along the North Alhamilla reverse fault via vertical Gafarillos fault segments, in between. Since the Messinian, fault activity migrated southwards forming the South Gafarillos fault and displacing the active fault-related mountain-front from the north to the south of Sierra de Polopos; whilst recent activity of the North Alhamilla reverse fault migrated westwards. The Polopos fault zone determined the differential uplift between the Sierra Alhamilla and the Tabernas-Sorbas basin promoting the middle Pleistocene capture that occurred in the southern margin of the Sorbas basin. Continued tectonic uplift of the Sierra Alhamilla-Polopos and Cabrera anticlinoria and local subsidence associated to the Palomares fault zone in the Vera basin promoted the headward erosion of the Aguas river drainage that captured the Sorbas basin during the late Pleistocene. |
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