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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7730

Authors: Payros, A.*
Dinarès-Turell, J.*
Bernaola, G.*
Orue-Etxebarria, X.*
Apellaniz, E.*
Tosquella, J.*
Title: On the age of the Early/Middle Eocene boundary and other related events: cyclostratigraphic refinements from the Pyrenean Otsakar section and the Lutetian GSSP
Title of journal: Geological Magazine
Series/Report no.: 3/148 (2011)
Publisher: Cambridge University Press
Issue Date: May-2011
DOI: 10.1017/S0016756810000890
Keywords: Eocene
Ypresian–Lutetian boundary
biostratigraphy
magnetostratigraphy
cyclostratigraphy.
Abstract: An integrated bio-, magneto- and cyclostratigraphic study of the Ypresian/Lutetian (Early/Middle Eocene) transition along the Otsakar section resulted in the identification of the C22n/C21r chron boundary and of the calcareous nannofossil CP12a/b zonal boundary; the latter is the main correlation criterion of the Lutetian Global Stratotype Section and Point (GSSP) recently defined at Gorrondatxe (Basque Country). By counting precession-related mudstone–marl couplets of 21 ka, the time lapse between both events was calculated to be 819 ka. This suggests that the age of the CP12a/b boundary, and hence that of the Early/Middle Eocene boundary, is 47.76 Ma, 250 ka younger than previously thought. This age agrees with, and is supported by, estimates from Gorrondatxe based on the time lapse between the Lutetian GSSP and the C21r/C21n boundary. The duration of Chron C21r is estimated at 1.326 Ma. Given that the base of the Eocene is dated at 55.8 Ma, the duration of the Early Eocene is 8 Ma, 0.8 Ma longer than in current time scales. The Otsakar results further show that the bases of planktonic foraminiferal zones E8 and P10 are younger than the CP12a/b boundary. The first occurrence of Turborotalia frontosa, being approximately 550 ka older that the CP12a/b boundary, is the planktonic foraminiferal event that lies closest to the Early/Middle Eocene boundary. The larger foraminiferal SBZ12/13 boundary is located close to the CP12a/b boundary and correlates with Chron C21r, not with the C22n/C21r boundary.
Appears in Collections:Papers Published / Papers in press
04.04.08. Sediments: dating, processes, transport
04.05.06. Paleomagnetism
04.04.10. Stratigraphy

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