High frequency floral changes at the Paleocene–Eocene boundary revealed by comparative biomarker and palynological studies
| Autor: | Claude Le Milbeau, Christian Dupuis, Jérémy Jacob, Sylvain Garel, Florence Quesnel, Mohammed Boussafir, Johann Schnyder, François Baudin, Emile Roche |
|---|---|
| Přispěvatelé: | 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) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Vascular plant
PETM 010504 meteorology & atmospheric sciences Molecular geochemistry Dieppe-Hampshire Basin 010502 geochemistry & geophysics medicine.disease_cause 01 natural sciences Sedimentary depositional environment Paleontology Geochemistry and Petrology Pollen Botany Pollen and spores study medicine [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment 0105 earth and related environmental sciences Floral changes Palynology biology Paleohydrology fungi food and beverages Juglandaceae Vegetation 15. Life on land biology.organism_classification Spore 13. Climate action Geology Marine transgression |
| Zdroj: | 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⟩ |
| ISSN: | 0146-6380 |
| DOI: | 10.1016/j.orggeochem.2014.09.005⟩ |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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