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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
- 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.
- Subjects :
- 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
Subjects
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⟩