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The first 40Ar–39Ar date from Oxfordian ammonite-calibrated volcanic layers (bentonites) as a tie-point for the Late Jurassic

Published online by Cambridge University Press:  19 August 2013

P. PELLENARD*
Affiliation:
Biogéosciences, CNRS-UMR 6282, Université de Bourgogne, F-21000 Dijon, France
S. NOMADE
Affiliation:
LSCE-IPSL, CNRS-UMR 8212, CEA Orme, F-91191 Gif-sur-Yvette, France
L. MARTIRE
Affiliation:
Dipartimento di Scienze della Terra, University of Torino, via Valperga Caluso 35 10125 Torino, Italy
F. DE OLIVEIRA RAMALHO
Affiliation:
Statoil ASA, Grenseveien 21, 4313 Forus, Norway
F. MONNA
Affiliation:
ARTeHIS, CNRS-UMR 6298, Université de Bourgogne, F-21000 Dijon, France
H. GUILLOU
Affiliation:
LSCE-IPSL, CNRS-UMR 8212, CEA Orme, F-91191 Gif-sur-Yvette, France
*
Author for correspondence: Pierre.Pellenard@u-bourgogne.fr

Abstract

Eight volcanic ash layers, linked to large explosive events caused by subduction-related volcanism from the Vardar Ocean back-arc, interbedded with marine limestones and cherts, have been identified in the Rosso Ammonitico Veronese Formation (northeastern Italy). The thickest ash layer, attributed to the Gregoryceras transversarium ammonite Biozone (Oxfordian Stage), yields a precise and reliable 40Ar–39Ar date of 156.1 ± 0.89 Ma, which is in better agreement with GTS2004 boundaries than with the current GTS2012. This first biostratigraphically well-constrained Oxfordian date is proposed as a new radiometric tie-point to improve the Geologic Time Scale for the Late Jurassic, where ammonite-calibrated radiometric dates are particularly scarce.

Type
Rapid Communication
Copyright
Copyright © Cambridge University Press 2013 

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