Los niveles condensados tortonienses en el margen pasivo de la Cuenca del Guadalquivircaracterización e implicaciones geológicas
- Abad de los Santos, Manuel
- Pendón Martín, José Gabriel
- González-Regalado Montero, María Luz
- Tosquella Angrill, Josep
- Ruiz Muñoz, Francisco
ISSN: 1576-5172
Año de publicación: 2005
Título del ejemplar: XV Congreso Nacional de Sedimentología y IV Coloquio de Estratigrafía y Paleogeografía del Pérmico y Triásico de España
Número: 8
Páginas: 21-25
Tipo: Artículo
Otras publicaciones en: Geotemas (Madrid)
Resumen
The Late Tortonian condensed section along the foreland margin of the Guadalquivir Basin, Southern Spain, overlains an omisson surface recorded within the uppermost deposits of the Niebla Fm. TST, Middle to Late Tortonian. It is composed of brown silty and clayey sediments up to 50% of glauconite grains, with abundant benthic foraminifers. The fossil content, foraminifers and ostracods, within a grain-size decreasing points to a progressive deepening upward. The REE concentration shows a gradual increase of the glauconite maturity along the vertical, with unhomogenous evolution according to a continental sediment input. The depth of the marine bottom was the main controlling factor of the glauconite maturity, being the sediment accumulation rate a secondarty factor. The upper increase of terrigenous sediments, with a glauconite decreasing, records the deposition of the overlying Gibraleón Shale Fm. HST.