The Pliocene Mediterranean infilling of the Messinian Erosional Surface: New biostratigraphic data based on calcareous nannofossils (Bajo Segura Basin, SE Spain)

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Title: The Pliocene Mediterranean infilling of the Messinian Erosional Surface: New biostratigraphic data based on calcareous nannofossils (Bajo Segura Basin, SE Spain)
Authors: Lancis Sáez, Carlos | Tent-Manclus, Jose Enrique | Flores, José Abel | Soria Mingorance, Jesús Miguel
Research Group/s: Cambios Paleoambientales | Evolución Geodinámica de la Cordillera Bética Oriental y de la Plataforma Marina de Alicante
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente
Keywords: Pliocene | Messinian Erosional Surface | Messinian Salinity Crisis | Zanclean | Calcareous nannofossils
Knowledge Area: Paleontología | Geodinámica Interna | Estratigrafía
Issue Date: Sep-2015
Publisher: Library of Geology (UB-CSIC)
Citation: Geologica Acta. 2015, 13(3): 211-228. doi:10.1344/GeologicaActa2015.13.3.4
Abstract: The Bajo Segura Basin (eastern Betic Cordillera) is a Mediterranean marginal basin where the Messinian Erosional Surface (MES), formed during the Messinian Salinity Crisis sea-level fall, is well developed. Overlying this major discontinuity the lower Pliocene transgressive sediments record the reflooding of the Mediterranean and the return to an open marine environment, the continental shelf being rebuilt after the Messinian erosion. The stratigraphic and biostratigraphic study of six sections allows two transgressive-regressive sequences filling the MES to be distinguished, correlated with the previously distinguished Mediterranean offshore seismic units. Ten calcareous nannofossil bioevents have been identified. The lower sequence can be dated according to nannofossil biozones NN12 to NN14 and the upper sequence by NN15 to NN16. The boundary between both lower Pliocene sedimentary sequences occur after the first common occurrence (FCO) of Discoaster asymmetricus found in the uppermost sediments of the lower sequence and before the first occurrence (FO) of Discoaster tamalis in the lowermost part of the upper sequence. Thus this sequence boundary can be estimated at between 4.1 and 4.0Ma ago.
Sponsor: This work has been supported by projects: CGL2007-65832/BTE Ministerio de Educación y Ciencia, CGL2009-07830/BTE Ministerio de Ciencia e Innovación, and PASUR.CGL2009-08651 Ministerio de Ciencia e Innovación Projects and BEST/2010/068 Generalitat Valenciana.
ISSN: 1695-6133 | 1696-5728 (Internet)
DOI: 10.1344/GeologicaActa2015.13.3.4
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Geologica Acta
Peer Review: si
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