Disoluciones e incrustaciones ferruginosas asociadas al OAE 1a en la plataforma carbonatada de La Florida (NO de Cantabria)

Abstract

The early Aptian succession of La Florida platform in northwestern Cantabria exhibits two stages of platform carbonates separated by a dissolution surface preceding the drowning of the platform. The dissolution surface was draped by a thin Fe-crust and the cavities subsequently filled with calcarenites of the second platform stage before being sealed by open marine marls formed as a consequence of the platform drowning. The marls correlate in age with the Early Aptian Oceanic Anoxic Event (OAE 1a). The aim of this work is to provide new data that may help to know the causal link between the karst surface, the Fe-crust and the drowning of the platform during the OAE