The Jaca Basin is located in the South of the Pyrenean mountain chain in Spain and was formed by the late Cretaceous and Tertiary convergence between the Iberian and European tectonic plates. During the Middle Eocene the sediment arising from the uplifting Pyrenees was deposited in the basin, and leading the uplift of Boltaña anticline. For this reason emergent areas were created in the hinterland to the north and northeast of the Jaca Basin (Remacha et at., 1998). These areas became the source of the first deltaic system infilling Jaca Basin, the Sabiñanigo Sandstones delta of Lutetian age. A biostratigraphic study based on calcareous nannofossils was carried out on the Middle Eocene deposits of the Jaca Basin. In this contribution we present the results obtained from the analysis of calcareous nannofossil assemblages from three different sities located in Jaca Basin: Yebra de Basa section, Asieso section and Barós section. The purpose of this work is to analyze the content of calcareous nannofossils in some sections of Pyrenean areas in order to understand if the associations investigated can be compared and dated with the biozonal schemes used for the Mediterranean area. Calcareous nannofossils are abundant throughout the studied interval even if they are not well preserved and have low diversity. Most of the important markers used to define the zonations of Fornaciari et al., (2010) are presents but not in all different sections analyzed. The Barós section shows a relative increase in abundance of small Reticulofenestra umbilicus associated with a decrease of Sphenolithus sp and Cribrocentrum reticulatum, while Coccolithus pelagicus and Ericsonia formosa not seem to show a remarkable decrease. Cyclicargolithus floridanus is one of the dominant placoliths of the assemblage. From this data the nannofossil assemblages present in Barós section can be dated with the scheme proposed by Fornaciari et al., (2010) and can be compared with the association of Alano section, NE Italy, reported in the work of Toffanin et al., (2011).

Calcareous nannofossils biostratigraphy from Middle Eocene deposits of Jaca Basin (Pyrenees, Spain)

MARCHI, ALESSANDRA;
2014-01-01

Abstract

The Jaca Basin is located in the South of the Pyrenean mountain chain in Spain and was formed by the late Cretaceous and Tertiary convergence between the Iberian and European tectonic plates. During the Middle Eocene the sediment arising from the uplifting Pyrenees was deposited in the basin, and leading the uplift of Boltaña anticline. For this reason emergent areas were created in the hinterland to the north and northeast of the Jaca Basin (Remacha et at., 1998). These areas became the source of the first deltaic system infilling Jaca Basin, the Sabiñanigo Sandstones delta of Lutetian age. A biostratigraphic study based on calcareous nannofossils was carried out on the Middle Eocene deposits of the Jaca Basin. In this contribution we present the results obtained from the analysis of calcareous nannofossil assemblages from three different sities located in Jaca Basin: Yebra de Basa section, Asieso section and Barós section. The purpose of this work is to analyze the content of calcareous nannofossils in some sections of Pyrenean areas in order to understand if the associations investigated can be compared and dated with the biozonal schemes used for the Mediterranean area. Calcareous nannofossils are abundant throughout the studied interval even if they are not well preserved and have low diversity. Most of the important markers used to define the zonations of Fornaciari et al., (2010) are presents but not in all different sections analyzed. The Barós section shows a relative increase in abundance of small Reticulofenestra umbilicus associated with a decrease of Sphenolithus sp and Cribrocentrum reticulatum, while Coccolithus pelagicus and Ericsonia formosa not seem to show a remarkable decrease. Cyclicargolithus floridanus is one of the dominant placoliths of the assemblage. From this data the nannofossil assemblages present in Barós section can be dated with the scheme proposed by Fornaciari et al., (2010) and can be compared with the association of Alano section, NE Italy, reported in the work of Toffanin et al., (2011).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/520274
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