El sector nororiental de la Cuenca de Antepaís del Guadalquivir (Cordillera Bética, Mioceno Superior): estratigrafía, cronología y evolución sedimentaria
- F. García-García 1
- H. Corbí 2
- D.A. García-Ramos 2
- J.M. Soria 2
- J.E. Tent-Manclús 2
- C. Viseras 3
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1
Universidad de Jaén
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2
Universitat d'Alacant
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3
Universidad de Granada
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ISSN: 0214-2708
Année de publication: 2014
Volumen: 27
Número: 1
Pages: 187-204
Type: Article
D'autres publications dans: Revista de la Sociedad Geológica de España
Résumé
A sedimentary revision of the marls and sandstone Miocene Units from the northeastern part of the Guadalquivir basin is here reported. Stratigraphical and sedimentological studies from field outcrop and biostratigraphical and palaeoecological analysis from field samples support the interpretations and results. The sedimentary infilling of the studied part of the basin is divided into four lihostratigraphic units (I to IV). Unit I (Lowermost Tortonian) is mainly represented by calcareous sandstone interpreted as the deposition at coastal systems vertically evolving to rhodalgal ramp environment. Unit II (Lower Tortonian, biozone MMi11: ca. 10-9.54 Ma) is formed by a rhythmite of silty and siliceous marls deposited in pelagic conditions of cold-eutrophic water. Foraminifera record a basinal shallowing from deep water. Heterolithic Unit III (Lower Tortonian, biozone MMi11: since 9.54 Ma) mainly consist of sandstones but slumped brecchias and marls laterally also occur. It is interpreted as sand banks or sand crestal ridges fed from northern margin deltas and controlled by tidal and storm currents in a starved pelagic ramp. Unit IV (Upper Tortonian, biozone MMi12: since 8.35 Ma) is mainly marly and the sedimentary interpretation is analogue to that of Unit III but in a deeper ramp.