Sedimentos continentales del tránsito Aptiense – Albiense intercalados en carbonatos de plataforma somera (Prebético de Jaén, S de España)
- L.M. Nieto 1
- J.M. Molina 1
- P.A. Ruiz-Ortiz 1
- J.M. Castro 1
- C. Martín-Closas 2
- M. Reolid 1
-
1
Universidad de Jaén
info
-
2
Universitat de Barcelona
info
ISSN: 1576-5172
Ano de publicación: 2016
Título do exemplar: IX CONGRESO GEOLÓGICO DE ESPAÑA
Número: 16
Páxinas: 629-632
Tipo: Artigo
Outras publicacións en: Geotemas (Madrid)
Resumo
During the Early Cretaceous, the Sierra of Bedmar-Jódar (Prebetic of Jaén, Betic Cordillera) made up a dipping NE tilted block, partially isolated from the prebetic platform. During the Aptian, in this block a shallow carbonate platform was developed, very sensitive to regional tectonic and to the relative sea level changes. During the Aptian-Albian transition, an extensional stage of the Central Atlantic occurred; then, in the platform a graben morphology developed, together with relative low sea level conditions. As a consequence, palustrine facies begun to develop, characterized by rhizholites and some ponds filled by black marls. As the palustrine environments were close to the coast and according to the tectonic unstability, a thin bed of orbitolines was deposited. This level was covered by new palustrine sediments. The sedimentary data and the presence of some kinds of charophytes such as Atopochara trivolvis trivolvis, Clavator grovesii lusitanicus and Munieria grambastii, show that these environments had wide water salinity changes. Over these palustrine sediments a second shallow carbonate platform was built during the Early Albian. The presence of these continental sediments between two episodes of shallow carbonate platform is described firstly in the Prebetic.