Los niveles condensados tortonienses en el margen pasivo de la Cuenca del Guadalquivir: caracterización e implicaciones geológicas

• Autores: Manuel Abad de los Santos, José Gabriel Pendón Martín, María Luz González-Regalado Montero, Josep Tosquella Angrill, Francisco Ruiz Muñoz
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 8, 2005 (Ejemplar dedicado a: XV Congreso Nacional de Sedimentología y IV Coloquio de Estratigrafía y Paleogeografía del Pérmico y Triásico de España), págs. 21-25
• Idioma: español
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• 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.