RT Journal Article T1 Caracterización geoquímica del horizonte glauconítico en el límite superior de la Formación Niebla (Tortoniense superior, SO España): Datos preliminares T1 Geochemical characterization of the glaucony horizon within the upper boundary of Niebla Formation (UpperTortonian, SW Spain): A preliminary approach A1 Abad de los Santos, Manuel A1 Rosa Díaz, Jesús de la A1 Pendón Martín, José Gabriel A1 Ruiz Muñoz, Francisco A1 González-Regalado Montero, María Luz A1 Tosquella Angrill, Josep AB An approach to the geochemical characteristics of the tortonian glaucony horizon cropping out along the northern margin of the Guadalquivir Basin is done in this note. The study of glauconite as well as t he host whole rock allows us to identify the glauconite origin discrimintating between its autochthonous or allochthonous provenance. Results suggest an autochtonous and evolved glauconite derived from a condensed section according to Amorosi (1995) criteria PB Sociedad Geológica de España YR 2003 FD 2003 LK http://hdl.handle.net/10272/8973 UL http://hdl.handle.net/10272/8973 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 28 may 2026