Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
215-227
Description:
2.2. Laboratorio di paleomagnetismo
Description:
JCR Journal
Description:
open
Keywords:
Late Eocene
;
Magnetostratigraphy
;
Biostratigraphy
;
calcareous Nannofossils
;
Pyrenean basin
;
04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy
;
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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