Magnetostratigraphy of the Miocene continental deposits of the Montes de Castejón (central Ebro basin, Spain): geochronological and paleoenvironmental implications
Pérez-Rivarés, F. J. (Universidad de Zaragoza. Departamento de Ciencias de la Tierra)
Garcés Crespo, Miguel (Universitat de Barcelona. Grup de recerca consolidat Geodinàmica i Anàlisi de Conques (GGAC))
Arenas, C. (Universidad de Zaragoza. Departamento de Anatomía, Embriología y Genética Animal. Departamento de Ciencias de la Tierra)
Pardo, G. (Universidad de Zaragoza. Departamento de Anatomía, Embriología y Genética Animal. Departamento de Ciencias de la Tierra)

Date:	2004
Abstract:	A detailed magnetostratigraphic study has been carried out in the early to middle Miocene distal alluvial and lacustrine sediments of the Montes de Castejón (central Ebro Basin). The study was based on the analysis of 196 magnetostratigraphic sites sampled along a stratigraphic interval of about 240 meters. Local magnetostratigraphy yielded a sequence of 12 magnetozones (6 normal and 6 reverse) which could be correlated with the Geomagnetic Polarity Time Scale (GPTS) interval C5Cr to C5AD (between 17 and 14. 3 Ma. ). The sampled sedimentary sequences include the boundary between two tectosedimentary units (TSU, T5 and T6) already defined in the Ebro Basin. The magnetostratigraphy of the Montes de Castejón allows to date the T5/T6 TSU boundary at 16. 14 Ma, within chron C5Cn. 1n. This magnetostratigraphy also allows us to analyse in detail as well as to discuss the variations in sedimentation rates through space and time between different lacustrine environments: Outer carbonate lacustrine fringes and distal alluvial plains (Montes de Castejón sections) show higher sedimentation rates than offshore lacustrine areas (San Caprasio section, 50 km east of Montes de Castejón).
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:	Magnetostratigraphy ; Geochronology ; Sedimentation rates ; Miocene ; Ebro basin
Published in:	Geologica acta, Vol. 2, Núm. 3 (2004) , p. 221-234, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/82205
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001429
DOI: 10.1344/105.000001429

14 p, 1.6 MB

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