Estructura extensiva cretácica e inversión terciaria del margen noroccidental de la subcuenca de Las Parras (Cordillera Ibérica, España)

• Autores: Carlos Luis Liesa Carrera, Ana Rosa Soria de Miguel, Alfonso Meléndez Hevia
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 1, 2, 2000 (Ejemplar dedicado a: V Congreso Geológico de España (Alicante, 10-14 julio 2000)), págs. 231-234
• Idioma: español
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• Resumen

  • The extensional structure of the Cretaceous Las Parras sub-basin was determined by a system of southward-dipping normal faults, usually of listric geometry, striking NW-SE to WNW-ESE and NE-SO. These faults were responsibles for basin tectonic subsidence, tilting and erosion of theTriassic and Jurassic pre-rift series, and thickness and facies variation of the Cretaceous sin-rift sequences. These extensional faults controlled the location and geometry of the compressional structures (reactivation as reverses or folding of extensional faults, neoformation of thrusts) during the complete inversion of the basin during the Tertiary and they brought about thepresent-day segmentation in this sector of the Portalrubio-Vandellos thurst system. Both, Mesozoicnormal faults and Tertiary thrusts show a basal detachment level in the slaty units of the Palaeozoic series and local detachment levels in cover series, mainly the marls and evaporites of the Upper-Triassic.