Paleohydrological and paleoenvironmental changes recorded in terrestrial sediments of the Paleocene-Eocene boundary (Normandy, France)

Garel, S.; Schnyder, J.; Jacob, J.; Dupuis, C.; Boussafir, M.; Le Milbeau, C.; Storme, Jean-Yves; Iakovleva, A. I.; Yans, J.; Baudin, F.; Fléhoc, C.; Quesnel, F.

doi:10.1016/j.palaeo.2013.02.035

Article (Scientific journals)

Paleohydrological and paleoenvironmental changes recorded in terrestrial sediments of the Paleocene-Eocene boundary (Normandy, France)

Garel, S.; Schnyder, J.; Jacob, J. et al.

2013 • In Palaeogeography, Palaeoclimatology, Palaeoecology, 376, p. 184-199

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10.1016/j.palaeo.2013.02.035

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Keywords :

Carbon isotopes; Continental ecosystems; Dieppe-Hampshire Basin; Hydrogen isotopes; Paleoenvironments; Paleohydrology; PETM; Hypsithermal; Paleocene-Eocene boundary; France; Normandy; Embryophyta; Tracheophyta

Abstract :

[en] The Paleocene-Eocene boundary (55.8. Ma) is associated with the Paleocene-Eocene Thermal Maximum (PETM), which is characterized by a negative Carbon Isotope Excursion (CIE), reflecting a major perturbation of the carbon cycle, and by an extreme and rapid global warming. The Cap d'Ailly area (Upper Normandy, France), in which previous studies have revealed the Paleocene-Eocene transition, is a reference locality for organic-rich terrestrial and lagoonal deposits of the "Sparnacian" stage, widespread in Northwestern Europe. In this study, we focus on the organic matter content of the Vasterival section. Organic data (Rock-Eval, palynofacies, biomarker analyses and compound specific isotope analyses) were acquired in order to constrain the paleoenvironmental and paleohydrological changes that occurred at the Paleocene-Eocene boundary. Stable carbon isotope compositions of higher plant leaf wax n-alkanes reveal a CIE of - 4.5‰, extending throughout the second half of the studied section. Palynofacies observations reveal: (i) an abrupt shift from a closed, quiescent marsh pond to an open eutrophic swamp subjected to algal blooms, concomitant with the onset of the CIE; and (ii) the evolution from a swamp to a tidal flat due to the marine transgression that occurred during the PETM. Higher plant biomarkers and their hydrogen isotopic composition compared to nitrogen analyses suggest: (i) dry episodes just before the PETM that may help to understand the triggering of this hyperthermal event; and (ii) a moister climate associated with a stronger seasonality during the early PETM.© 2013 ElsevierB.V.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Garel, S.; UPMC Université Paris 06/CNRS, UMR 7193 ISTeP, 4 place Jussieu, 75005 Paris, France, Université d'Orléans, ISTO, UMR 7327, 45071 Orléans, France, CNRS/INSU, ISTO, UMR 7327, 45071 Orléans, France, BRGM, ISTO, UMR 7327, BP 36009, 45060 Orléans, France, BRGM GéoRessources/GAT, 45060 Orléans Cedex 2, France

Schnyder, J.; UPMC Université Paris 06/CNRS, UMR 7193 ISTeP, 4 place Jussieu, 75005 Paris, France

Jacob, J.; Université d'Orléans, ISTO, UMR 7327, 45071 Orléans, France, CNRS/INSU, ISTO, UMR 7327, 45071 Orléans, France, BRGM, ISTO, UMR 7327, BP 36009, 45060 Orléans, France

Dupuis, C.; Laboratoire de Géologie Fondamentale et Appliquée, Faculté Polytechnique de Mons, Université de Mons, rue de Houdain 9, B-7000 Mons, Belgium

Boussafir, M.; Université d'Orléans, ISTO, UMR 7327, 45071 Orléans, France, CNRS/INSU, ISTO, UMR 7327, 45071 Orléans, France, BRGM, ISTO, UMR 7327, BP 36009, 45060 Orléans, France

Le Milbeau, C.; Université d'Orléans, ISTO, UMR 7327, 45071 Orléans, France, CNRS/INSU, ISTO, UMR 7327, 45071 Orléans, France, BRGM, ISTO, UMR 7327, BP 36009, 45060 Orléans, France

Storme, Jean-Yves ; Université de Liège - ULiège

Iakovleva, A. I.; Geological Institute, Russian Academy of Sciences, 109017 Moscow, Russian Federation

Yans, J.; FUNDP, Namur, Department of Geology, 61 rue de Bruxelles, 5000 Namur, Belgium

Baudin, F.; UPMC Université Paris 06/CNRS, UMR 7193 ISTeP, 4 place Jussieu, 75005 Paris, France

Fléhoc, C.; BRGM LAB/ISO, 45060 Orléans Cedex 2, France

Quesnel, F.; BRGM, ISTO, UMR 7327, BP 36009, 45060 Orléans, France, BRGM GéoRessources/GAT, 45060 Orléans Cedex 2, France

Language :

English

Title :

Paleohydrological and paleoenvironmental changes recorded in terrestrial sediments of the Paleocene-Eocene boundary (Normandy, France)

Publication date :

2013

Journal title :

Palaeogeography, Palaeoclimatology, Palaeoecology

ISSN :

0031-0182

eISSN :

1872-616X

Publisher :

Elsevier Science, Amsterdam, Netherlands

Volume :

376

Pages :

184-199

Peer reviewed :

Peer Reviewed verified by ORBi

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