Turbiditas carbonatadas en la Playa de Muriola (Barrika, Arco Vasco): edad, deformación, contenidos de CaCO3 y presencia de barita diagenética

Abstract

The Playa de Muriola sea-cliff exposes three different sections of carbonate turbidite layers from the Early Turonian of the deep Basque Arc domain. High-resolution analysis (% CaCO3) of the turbidites (calcarenites and marls) points out: a) a major CaCO3 content in calcarenites than in marls; and b) a decrease tendency in carbonate content from the bottom towards the top of the calcarenite bed. We confirm an intense softsediment deformation (simple-double wedges, deformation bands, shear vein systems, etc.). Also, the presence of a small anoxic event, red-marls corresponding to the Cretaceous oceanic red beds (CORB's) and an unusual barite (BaSO4) nodules are discussed