The Bartonian-Priabonian marine record of the eastern South Pyrenean Foreland Basin (NE Spain) : a new calibration of the larger foraminifers and calcareous nannofossil biozonation
Costa, E. (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)
Garcés Crespo, Miguel (Universitat de Barcelona. Grup de recerca consolidat Geodinàmica i Anàlisi de Conques (GGAC))
López-Blanco, M. (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)
Serra-Kiel, Josep (Universitat de Barcelona. Grup de recerca consolidat Geodinàmica i Anàlisi de Conques (GGAC))
Bernaola Bilbao, Gilen (Universidad del País Vasco. Departamento de Ingeniería Minera y Metalúrgica y Ciencia de los Materiales.)
Cabrera, Lluís (Universitat de Barcelona. Grup de recerca consolidat Geodinàmica i Anàlisi de Conques (GGAC))
Beamud, E. (Universitat de Barcelona. Laboratori de Paleomagnetisme)

Date:	2013
Abstract:	This study presents a combined biostratigraphic (calcareous nannofossils, larger foraminifers) and magnetostratigraphic study of the Middle and Late Eocene marine units of the Igualada area, eastern Ebro Basin. The studied sections of Santa Maria de Miralles and La Tossa encompass the complete marine succession of the Santa Maria Group, where assemblages rich in larger foraminifers have been studied since the early 1950's. A total of 224 paleomagnetic sites and 62 biostratigraphic samples were collected along a 1350m-thick section that ranges from chron C20n to chron C16n (~43Ma to ~36Ma). The resulting magnetostratigraphy-based chronology challenges existing chronostratigraphic interpretations of these units and results in a new calibration of the biostratigraphic zonations. The base of calcareous nannofossil Zone NP19-20 is pinned down to an older age than its presently accepted attribution, whereas the time span assigned to Zone NP18 is significantly reduced. A revised calibration of larger foraminifers indicates that Zone SBZ18, formerly assigned exclusively to the late Bartonian, extends its range to the earlymost Priabonian, the Bartonian stage being almost entirely represented by Zone SBZ17. A division of Zone SBZ18 into two subzones is proposed.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Middle/Late Eocene ; Chronostratigraphy ; Magnetostratigraphy ; Biostratigraphy ; Time Scale
Published in:	Geologica acta, Vol. 11, Núm. 2 (Juny 2013) , p. 177-193, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/265939
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001779
DOI: 10.1344/105.000001779

40 p, 6.6 MB

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