The early/middle Eocene transition at the Ésera valley (SouthCentral Pyrenees) : implications in Shallow Benthic Zones (SBZ)
Rodríguez-Pintó, Adriana
Serra-Kiel, Josep (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Bernaola Bilbao, Gilen (Universidad del País Vasco. Departamento de Ingeniería Minera y Metalúrgica y Ciencia de los Materiales)
Barnolas, Antonio (Instituto Geológico y Minero de España)
Pueyo, Emilio (Universidad de Zaragoza)
Tosquella Angrill, Josep (Universidad de Huelva. Departamento de Ciencias de la Tierra)
Arbués, Pau (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Scholger, Robert (University of Leoben. Chair of Applied Geophysics)

Date:	2020
Abstract:	An integrated study including magnetostratigraphy, larger benthic foraminifera and calcareous nannofossil biostratigraphy is presented herein. This work was performed in shallow marine siliciclastics rich in larger foraminifera, around the Ypresian/Lutetian boundary in the Ésera valley (South-Central Pyrenees). Although the calcareous nannofossil content in the studied interval is low, not allowing a precise Y/L boundary to be recognised, the taxa found are enough to support the chronostratigraphic attribution. Data obtained in the Ésera valley section has improved the knowledge of larger benthic foraminifera (Nummulites and Assilina) distribution through chron C21. SBZ 11 to SBZ 12 transition took place at the lowermost C21r, as shown in previous works. SBZ 12 assemblages extend into C21n, where the SBZ 12 to SBZ 13 boundary occurs. These data, obtained in shallow marine siliciclastic facies, with in situ fauna, results in a shift of the SBZ 12/SBZ 13 boundary to the Lower Lutetian, younger than previously believed. Accordingly, the Ypresian/Lutetian boundary occurs in SBZ 12.
Grants:	Ministerio de Economía y Competitividad PGC2018-093903-C1 Ministerio de Economía y Competitividad CGL2014-54118-C2-2-R Agencia Estatal de Investigación PID2019-104693GB-I00 Agencia Estatal de Investigación CGL2017-90632-REDT
Note:	Acknowledgement. AB fieldwork has been supported by the project PGC2018-093903-C1, additional support came from the projects DR3AM (CGL2014-54118-C2-2-R) MAGIBERII (CGL2017-90632-REDT) and UKRIA4D (PID2019-104693GB-I00/CTA) all of them from the Spanish Science National Plan. The study of calcareous nannofossils was supported by the Research Group of the Basque University System IT-1602-22. Pablo Calvín gave us a hand with the reversal test in Python. The accurate and constructive comments from Johannes Pignatti, Elisabet Beamud, the Journal Manager Laura Rincón, and the editors Carles Martín Closas, Eulàlia Gili and Miguel Garcés helped to improve the original manuscript.
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, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Magnetostratigraphy ; Larger benthic foraminifera ; Calcareous nannofossils ; Ypresian - Lutetian boundary ; South-Central Pyrenean Basin
Published in:	Geologica acta, Vol. 18 Núm. 2 (2020) , p. 1-25 (Articles) , ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/403604

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