Análisis integrado de una sucesión marina transgresiva (Mioceno superior, Cuenca de Guadix, Cordillera Bética)
- M. Poyatos-Moré 1
- F. García-García 2
- J.M. Soria 3
- F.J. Rodríguez-Tovar 2
- F. Pérez-Valera 3
- J.J. Peral 3
- C. Viseras 2
- I. Midtkandal 1
- 1 Universidad of Oslo
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2
Universidad de Granada
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3
Universitat d'Alacant
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ISSN: 1576-5172
Year of publication: 2021
Issue Title: X Congreso Geológico de España
Issue: 18
Pages: 185
Type: Article
More publications in: Geotemas (Madrid)
Abstract
The late Miocene of Guadix Basin offers the possibility to study a dominantly clastic transgressive succession in a tecto- nically-active setting. To do this, >600 m have been studied along >10 km, with geological mapping, sedimentary logging and correlation, integrated with biostratigraphic, ichnological and petrological data. The succession starts with offshore transition marls and HCS sandstones with Scolicia. They are replaced by shoreface sandstones with combined-flow ripples. These are truncated by transgressive erosion surfaces with Thalassinoides and Planolites, associated with carbonate-clastic subtidal bars, with large-scale sigmoidal cross bedding and skeletal fragments. These bars are capped by flooding surfaces with highly-bioturbated marls and sandstones. The middle part of the succession shows medium to coarse-grained delta front sandstones, with extrabasinal clasts, coal fragments and Ophiomorpha, interfingering with tidal sandwaves, and channelized conglomerates. The upper part of the succession displays a shoreface-offshore transition, with bioturbated and organic-rich sandstone lobes, replaced by HCS sandstones, and finally by marls with benthic foraminifera from neritic-epibathyal paleo- bathymetry. The succession onlaps the basement to the ESE, and thickens to the W-NW. Fine-grained petrography indicates an influence of Zonas Internas, whereas coarse-grained facies indicate local phases of tectonic uplift and erosion. These results suggest a syn-tectonic deposition, in a strait where tidal influence was enhanced by the Atlantic-Mediterranean con- nections, and where the interaction between source areas and a dynamic basin morphology resulted in complex stacking patterns in an overall transgressive succession.