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High frequency floral changes at the Paleocene–Eocene boundary revealed by comparative biomarker and palynological studies

High frequency floral changes at the Paleocene–Eocene boundary revealed by comparative biomarker and palynological studies

Authors :
Claude Le Milbeau
Christian Dupuis
Jérémy Jacob
Sylvain Garel
Florence Quesnel
Mohammed Boussafir
Johann Schnyder
François Baudin
Emile Roche
Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)
Institut des Sciences de la Terre de Paris (iSTeP)
Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)
Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO)
Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC)
Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)
Département de Géologie
Université de Liège
Géologie GFA
Faculté polytechnique de Mons
Université de Mons (UMons)-Université de Mons (UMons)
ANR-10-JCJC-0607,PalHydroMil,Reconstructions paléohydrologiques à partir du dD de lipides produits par les végétaux supérieurs. Calibration, validation et application aux variations hydrologiques dans les Alpes pendant l'âge du Bronze(2010)
Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC)
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)
Source :
Organic Geochemistry, Organic Geochemistry, Elsevier, 2014, 77, pp.43-58. ⟨10.1016/j.orggeochem.2014.09.005⟩, Organic Geochemistry, 2014, 77, pp.43-58. ⟨10.1016/j.orggeochem.2014.09.005⟩
Publication Year :
2014
Publisher :
HAL CCSD, 2014.

Abstract

International audience; The Cap d'Ailly area (Upper Normandy, France) shows several terrestrial–lagoonal sections recording the negative carbon isotope excursion (CIE) associated with the Paleocene–Eocene Thermal Maximum (PETM; 55.8 Ma). A study of the biomarkers and spore/pollen content of the Vasterival section gave com-plementary information on paleofloral changes that occurred around the Paleocene–Eocene (P–E) bound-ary. Aliphatic hydrocarbon fractions revealed a high abundance of vascular plant biomarkers, including tricyclic diterpanes derived from conifers, fernenes derived from ferns and des-A-triterpenes derived from angiosperms. Whereas the vegetation of the depositional environment surroundings seemed alter-nately dominated by ferns and angiosperms (revealed from biomarkers), the regional flora seemed dom-inated strictly by angiosperms such as Juglandaceae (revealed by pollen). Spore/pollen assemblages revealed no major turnover in the paleovegetation, but slight variation in vegetation composition. How-ever, both biomarkers and spores/pollen exhibited two intervals of rapid floral change: the first occurred around the P–E boundary and the second at the top of the strictly terrestrial unit that coincides with a marine transgression. Comparison of the data with published paleoclimatic results, obtained from the same samples, indicated that the first interval of floral change correlates with strong paleohydrological perturbations, whereas the second is linked to an increasing marine influence.

Details

Language :
English
ISSN :
01466380
Database :
OpenAIRE
Journal :
Organic Geochemistry, Organic Geochemistry, Elsevier, 2014, 77, pp.43-58. ⟨10.1016/j.orggeochem.2014.09.005⟩, Organic Geochemistry, 2014, 77, pp.43-58. ⟨10.1016/j.orggeochem.2014.09.005⟩
Accession number :
edsair.doi.dedup.....e1c03328654486bf0e18b57057878fa4
Full Text :
https://doi.org/10.1016/j.orggeochem.2014.09.005⟩