Los depósitos de abanico aluvial proximal de la Illa Mateua (l'Escala, Girona). Caracterización geológica, interpretación genética y temporal

Abstract

We describe an outcrop of Neogene alluvial sediments located between I’Escala and Cala Montgó.

These sediments are infilling a paleovalley incised in Mesozoic carbonates of the Montgri Massif. Both lithohgic composition of the deposits and their characteristics (mainly grain size and paleocurrents) indicate: (1) the existence of a Paleozoic and Mesozoic source area situated close to the sedimentation area; and (2) the source area would be located in the place actually occupied by the Badia de Roses, before the Empordá Neogene basin was formed. The incision could have been helped by karstic phenomena related to a regional importance fracture zone