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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 29 Jun 2018

Research article | 29 Jun 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Solid Earth (SE).

Cross-continental age calibration of the Jurassic/Cretaceous boundary

Luis Lena1, Rafael López-Martínez2, Marina Lescano3, Beatriz Aguirre-Urrreta3, Andrea Concheyro3, Verónica Vennari3, Maximiliano Naipauer3, Elias Samankassou1, Marcio Pimentel4, Victor Ramos3, and Urs Schaltegger1 Luis Lena et al.
  • 1Department of Earth Sciences, University of Geneva, Geneva, 1205, Switzerland
  • 2Instituto de Geología, Universidad Nacional Autónoma de Mexico, Ciudad de Mexico, 02376, Mexico
  • 3Instituto de Estudios Andinos Don Pablo Groeber (UBA-CONICET), Universidad de Buenos Aires, Buenos Aires, 1428, Argentina
  • 4Instituto de Geociências, Universidade de Brasilia, Brasilia, DF, 70910-900, Brasil

Abstract. The age of the Jurassic/Cretaceous boundary has remained elusive for the past decades. In this study we evaluate how well the determined boundary age agrees between two distinct sections from different sedimentary basins, and whether we can constrain a globally valid Jurassic/Cretaceous boundary age. Here we present high-precision U-Pb zircon age determinations on single grains of volcanic zircon of two sections that span the Jurassic/Cretaceous: the Las Loicas section, Argentina, and the Mazatepec section in Mexico. These two sections display well-established primary and secondary stratigraphic markers as well as interbedded volcanic horizons that allow bracketing the age of the Jurassic/Cretaceous boundary at 140.22±0.13Ma. We also present the first age determinations in the early Tithonian and tentatively propose a minimum duration of ~7Ma for the Tithonian stage.

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