Tectonic evolution of the Malaga Basin (Alboran Sea): insights from its sedimentary infill
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Abstract
La cuenca de Málaga es una subcuenca de la Cuenca del Mar de Alboran,
que a su vez representa el retro arco del Sistema del Arco de Gibraltar.
Se trata de una semifosa cuya secuencia sedimentaria del Mioceno hasta el
Holoceno se encuentra muy completa. Para determinar la arquitectura tectónica
en 3D de esta semifosa se han interpretado una red de perfiles sísmicos
comerciales de sísmica multicanal, lo que permite determinar su evolución
geodinámica. El mapa resultante, que incluye estructuras formadas
en el Mioceno Inferior y Medio correspondientes a la etapa de rift, y estructuras
generadas o reactivadas en compresión durante el Mioceno Superior
muestra notables diferencias en el estilo estructural entre los flancos septentrional
y meridional de la Cuenca de Málaga. Además, nuestros resultados
muestran que la inversión tectónica que afecta al relleno sedimentario
en la cuenca de Málaga cesó a finales del Messiniense, hecho que contrasta
con lo que se observa en zonas más meridionales y orientales de la Cuenca
del Mar de Alboran
The Malaga Basin is a subbasin of the Alboran Sea Basin, which in turn represents the backarc of the Gibraltar Arc System. It is a half-graben which shows a very complete Miocene to Holocene sedimentary sequence. In order to determine the 3D tectonic framework of this half-graben, we interpreted a grid of multichannel seismic commercial profiles, to constrain its geodynamic evolution. A map of the lower to middle Miocene structures that occurred during the rifting events as well as structures generated or reactivated in compression during Tortonian times shows striking differences regarding the structural style from the northern to the southern flank of the Malaga Basin and also along strike of this half-graben. Moreover, our results point that the tectonic inversion and compressional deformation within the sedimentary infill ceased by end of the Messinian, which contrast with the southern and eastern areas of the Alboran Basin
The Malaga Basin is a subbasin of the Alboran Sea Basin, which in turn represents the backarc of the Gibraltar Arc System. It is a half-graben which shows a very complete Miocene to Holocene sedimentary sequence. In order to determine the 3D tectonic framework of this half-graben, we interpreted a grid of multichannel seismic commercial profiles, to constrain its geodynamic evolution. A map of the lower to middle Miocene structures that occurred during the rifting events as well as structures generated or reactivated in compression during Tortonian times shows striking differences regarding the structural style from the northern to the southern flank of the Malaga Basin and also along strike of this half-graben. Moreover, our results point that the tectonic inversion and compressional deformation within the sedimentary infill ceased by end of the Messinian, which contrast with the southern and eastern areas of the Alboran Basin
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