Sedimentación deltaica tras una regresión forzada por la tectónica (Mioceno Superior, borde suroccidental de la Cuenca de Guadix)

• Autores: Fernando García-García, Juan Fernández Martínez, Jesús Miguel Soria Mingorance, César Viseras Alarcón
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 3, 1, 2001 (Ejemplar dedicado a: XIV Congreso Nacional de Sedimentología, IV Congreso del Cretácico de España), págs. 161-164
• Idioma: español
• Enlaces
  • Texto Completo Ejemplar
• Resumen

  • The marine deposits outcropping in the Cuadix Basin (Betic Cordillera) are made up of three upper Tortonian stratigraphic units: Unit I (TST: Transgressive Systems Tract), Unit II (HST: Highstand Systems Tract) and Unit III (LST: Lowstand Systems Tract). Unit III had not been identified in the southwest margin of the basin till this paper. This last marine unit is composed by a Cilbert-type delta which lies on the pelagic basin deposits of Unit II. The relative sea-level fall between Units II and III can be quantified on 200 m at least and it carried out a basinward migration of the shoreline of 2 km at least. Unit III developed desattached from the HST-shelf and slope systems, so defining a desattached lowstand systems tract (LST) in this sector of the basin. The tectonic uplifting of Sierra Nevada during uppermost Tortonian triggered the relative sea-level falling. Then, autocyclic factors controlled the Cilbert-type delta migration on a shallow sea poorly connected with the Atlantic and Mediterranean Sea.