Ciclos de somerización en un lagoon de baja energía (Aptiense de la Sierra de Jódar, Prebético de Jaén. Cordillera Bética)
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Universidad de Jaén
info
ISSN: 1576-5172
Datum der Publikation: 2012
Titel der Ausgabe: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.
Nummer: 13
Seiten: 135-138
Art: Artikel
Andere Publikationen in: Geotemas (Madrid)
Zusammenfassung
The Sierra de Jódar-Bedmar is an outcrop belonging to the Prebetic of Jaén. The main feature is the presence of a thick succession of Aptian shallow platform carbonates. In the upper Aptian (Pseudochoffatella cuvilleri biozone) at least, nine shallowing-upward cycles organized in a thickeningupwards successions have been distinguished. In general, they are composed by a lower level of brechoid limestones with miliolids and characeae, locally with orbitolinids, and an upper level with characeae limestones, with irregular morphology and rizholites in their top. Only at the bottom of the first cycle, a calcarenite bed is present. Several types of paleofractures (some of them normal paleofaults) can be recognized in the top of some cycles. These cycles were deposited in a coastal shallow carbonate lagoon, probably bounded by a calcarenite bar; freshwater and marine water influenced the sedimentation into this environment. The development of the cycles is considered to be controlled by relative sea-level changes within an extensional tectonic context related with the Aptian Atlantic rifting stage.