Depósitos submarinos asociados al deslizamiento gigante del Puerto del Rosario (norte de Fuerteventura, Islas Canarias)

Abstract

On the western coast of Fuerteventura, north of Puertito de Los Molinos, the basal shear surface of the Puerto del Rosario slide crops out. Over the surface, several levels of breccias, conglomerates and sands occur, interspersed with pillow-lavas and pillow-lavas fragment breccias, which represent a sequence of subaqueous mass flows. Flows that deposited the breccias and sands represent the underwater transformation of debris avalanches related to the main landslide of Puerto del Rosario and with other secondary landslides. Flows represented by conglomerate resulted from the underwater transformation of hyper-concentrated subaerial flows and from the collapse of the pillow-lavas present in coastal lava deltas. The occurrence of these submarine materials above the current sea level seems to be related to a generalized uplift of the western part of Fuerteventura, possibly related to the isostatic readjustment suffered by this part of the island as a result of the enormous mass release caused by the Puerto del Rosario slide.