Publication: Nuevos eventos deformacionales registrados en el Segmento SO de la Falla de Carrascoy (Murcia, España): implicaciones en el modelo de crecimiento
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Publication Date
2016
Authors
Martín Banda, Raquel
Insúa Arévalo, Juan Miguel
Salazar, A.
Crespo Martín, C.
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Sociedad Geológica de España
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Abstract
La Falla de Carrascoy es una falla de desgarre sinestral que forma parte del Corredor de Cizalla de las Béticas Orientales. Con dos segmentos solapados (SO y NE) controla el borde norte de la Sierra de Carrascoy y su articulación con la Depresión del Guadalentín. El segmento SO está formado por la zona de Falla de Algezares – Casas Nuevas, un sistema de pliegues y cabalgamientos que conforman relieves de tipo foreberg dispuestos en échelon, mostrando la migración progresiva de la deformación hacia el NO desde el frente montañoso controlado por la falla de desgarre sinestral (Falla de Carrascoy s.s.). Estudios previos sitúan el inicio de la formación de la Falla de Algezares – Casas Nuevas en el Pleistoceno medio. En el presente trabajo se han identificado nuevos eventos de deformación tectónica en el extremo NE de la falla que pliegan y cabalgan los sedimentos de abanicos aluviales del Pleistoceno superior. Estos eventos posteriores a los registrados en localizaciones más occidentales en los trabajos previos, se ajustan a un modelo de crecimiento en el que la longitud de la falla aumenta gradualmente con cada terremoto.
The Carrascoy Fault is a left-lateral strike-slip fault belonging to the Eastern Betic Shear Zone. With two overlapping segments (SW and NE), this fault controls the northern edge of the Carrascoy Range and its linkage with of the Guadalentín Depression. The SW segment is formed by the Algezares – Casas Nuevas Fault zone, a fold-and-thrust system constituting foreberg-type, en-echelon-arranged reliefs that show the progressive northwestward migration of deformation from the front controlled by the left-lateral strike-slip (s.s. Carrascoy Fault). Prior studies locate the onset of the Algezares – Casas Nuevas Fault in the middle Pleistocene. In this paper we have identified new tectonic events at the NE fault tip, which fold and thrust the sediments of late Pleistocene alluvial fans. These events are younger than those recorded westernmost in previous studies, and they support a growth model in which the length fault gradually increases with each earthquake.
The Carrascoy Fault is a left-lateral strike-slip fault belonging to the Eastern Betic Shear Zone. With two overlapping segments (SW and NE), this fault controls the northern edge of the Carrascoy Range and its linkage with of the Guadalentín Depression. The SW segment is formed by the Algezares – Casas Nuevas Fault zone, a fold-and-thrust system constituting foreberg-type, en-echelon-arranged reliefs that show the progressive northwestward migration of deformation from the front controlled by the left-lateral strike-slip (s.s. Carrascoy Fault). Prior studies locate the onset of the Algezares – Casas Nuevas Fault in the middle Pleistocene. In this paper we have identified new tectonic events at the NE fault tip, which fold and thrust the sediments of late Pleistocene alluvial fans. These events are younger than those recorded westernmost in previous studies, and they support a growth model in which the length fault gradually increases with each earthquake.