Per citar aquest document: http://ddd.uab.cat/record/85795
Integrated calcareous nannofossil biostratigraphy and magnetostratigraphy from the uppermost marine Eocene deposits of the southeastern Pyrenean foreland basin : evidences for marine Priabonian deposition
Cascella, Antonio (Istituto Nazionale di Geofisica e Vulcanologia (INGV))
Dinarès-Turell, Jaume (Istituto Nazionale di Geofisica e Vulcanologia (INGV))

Data: 2009
Resum: An integrated magneto-biostratigraphic study, based on calcareous nannofossils, was carried out on the Eocene uppermost marine deposits of the southeastern Pyrenean foreland basin. The study was performed along six sections of the upper portion of Igualada Formation, cropping out in the Vic area. Common late Middle/Upper Eocene nannofossil assemblages allow recognizing, within a normal magnetozone or immediately below, the FO of Istmolithus recurvus, which identifies the base of NP19 Zone, in the Priabonian. This event occurs within C16n. 2n magnetozone in several oceanic and Mediterranean sections, which allows the correlation of the normal magnetozone in the Vic area to chron C16n. 2n. This challenges previous magnetostratigraphic interpretations in the Vic area that correlated the uppermost marine sediments to chron C17n. The estimated age for the FO of I. recurvus is 36 Ma and collectively with the magnetostratigraphic data indicates that the uppermost marine sediments in the basin are of Priabonian age. The new results indicate that the entire chronology of the marine strata needs reassessment. The thickness of chron C16n. 2n varies from 45 m in the Collsuspina area (southern sector) to about 270-290 m in the Sant Bartomeu del Grau area (northern sector), which is indicative of a marked asymmetry in the basin deposition.
Drets: 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. Creative Commons
Llengua: Anglès.
Document: article ; recerca ; publishedVersion
Matèria: Late Eocene ; Magnetostratigraphy ; Biostratigraphy ; Calcareous Nannofossils ; Pyrenean basin
Publicat a: Geologica acta, Vol. 7, Núm. 1-2 (Març-Juny 2009) , p. 281-296, ISSN 1696-5728

Adreça alternativa: http://www.raco.cat/index.php/GeologicaActa/article/view/125135
DOI: 10.1344/105.000000282


16 p, 2.0 MB

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