Publication: Fases iniciales del desarrollo de un borde de cuenca de tipo rift: estudio de un sector al SW de la Cordillera Ibérica
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Publication Date
2015
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Sociedad Geológica de España
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Abstract
Se estudia el desarrollo del borde extensional de la Cuenca Ibérica durante sus primeras etapas de evolución (rift Pérmico) mediante el análisis de un sector de la falla maestra de la Serranía de Cuenca en el área de Boniches, SO de la Cordillera Ibérica. La evolución de dicho borde, en la zona de estudio, se caracteriza mediante el desarrollo de seis pulsos tectónicos que generaron cinco fallas normales con forma de arco que convergen hacia el N. El movimiento y salto progresivo de cada una de estas fallas generó espacios en los que se acumularon dos secuencias deposicionales cuyos sedimentos se disponen en onlap sobre el basamento paleozoico. Dichas fallas formaron bloques progresivamente mayores, oscilando entre 260 m y 1.250 m de ancho y, produjeron un ensanchamiento en la cuenca hacia el SO de aproximadamente 1 km cada 1 m.a. El ensanchamiento conllevó un cambio en los estilos fluviales y en las direcciones de paleocorrientes. Estos sistemas se adaptaron a los paleorelieves existentes en los bloques y a la inclinación de los mismos, provocando encajamientos y la distribución asimétrica de los sedimentos sobre aquellos.
The development of the extensional edge of the Iberian Basin during its first evolutionary stages (Permian rift) is studied by means of the analysis of a sector of the Serranía de Cuenca master fault around Boniches area, SW Iberian Ranges. The evolution of this border in the study area is characterized by the development of six tectonic pulses related to five arcuated normal faults that join northward. The movement and vertical displacement of these faults generated spaces in which two depositional sequences were deposited on the Paleozoic basement with an onlap disposition. The faults formed blocks that progressively increased their size from 260 m to 1250 m width, allowing a southwestward basin enlargement of about 1 km every 1 m.a. This enlargement also allowed a change in the fluvial systems styles and their palaeocurrents. These systems adapted their rivers to the preexisting block palaeoreliefs and to the dip of their surfaces developing the asymmetrical distribution of sediments
The development of the extensional edge of the Iberian Basin during its first evolutionary stages (Permian rift) is studied by means of the analysis of a sector of the Serranía de Cuenca master fault around Boniches area, SW Iberian Ranges. The evolution of this border in the study area is characterized by the development of six tectonic pulses related to five arcuated normal faults that join northward. The movement and vertical displacement of these faults generated spaces in which two depositional sequences were deposited on the Paleozoic basement with an onlap disposition. The faults formed blocks that progressively increased their size from 260 m to 1250 m width, allowing a southwestward basin enlargement of about 1 km every 1 m.a. This enlargement also allowed a change in the fluvial systems styles and their palaeocurrents. These systems adapted their rivers to the preexisting block palaeoreliefs and to the dip of their surfaces developing the asymmetrical distribution of sediments