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42 results on '"Vergnaud-Grazzini, C."'

1. Abrupt hydrographic change in the Alboran Sea (western Mediterranean) around 8000 yrs BP

Author

Rohling, E.J., Dulk, M. Den, Pujol, C., and Vergnaud-Grazzini, C.

Subjects
Mediterranean Sea -- Natural history, Hydrographic surveying -- Mediterranean Sea, Marine fauna -- Observations, Earth sciences
Abstract

The Alboran Sea in the western Mediterranean experienced a sudden change in the planktonic foraminiferal fauna, around 8000 yrs BP. The period of the formation of a distinct geostrophic front system isolating the jet of Atlantic waters into the Mediterranean coincided with the faunal change. The faunal change may have occurred due to a rise in the sea level, in comparison to the maximum level during glacial period.

Published
1995

14. Enhanced rainfall in the mediterranean region during the last sapropel event Meditcrranean sea Paleoclimatology Paleoceanography Sapropel events Isotopes ABSTRACT Mer Méditerranée Paléoclimatologie Paléocéanographie Evénement sapropèle Isotope

Author

Kallel, Nejib, Paterne, Martine, Duplessy, J.C., Vergnaud-Grazzini, C., Pujol, Claude, Labeyrie, Laurent, Arnold, Maurice, Fontugne, Michel, Pierre, Catherine, Duplessy, Jean-Claude, Vergnaud-Grazzini Tc, Colette, Centre des Faibles Radioactivités, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), École Nationale d'Ingénieurs de Sfax | National School of Engineers of Sfax (ENIS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
1997

15. Evaluation of the Plio-Pleistocene astronomical timescale

Author

Lourens, L.J. Antonarakou, A. Hilgen, F.J. Van Hoof, A.A.M. Vergnaud-Grazzini, C. Zachariasse, W.J.

Subjects
Astrophysics::Earth and Planetary Astrophysics, Physics::Geophysics
Abstract

An astronomically calibrated timescale has recently been established [Hilgen, 1991a, b] for the Pliocene and earliest Pleistocene based on the correlation of dominantly precession controlled sedimentary cycles (sapropels and carbonate cycles) in Mediterranean marine sequences to the precession time series of the astronomical solution of Berger and Loutre [1991] (hereinafter referred to as Ber90). Here we evaluate the accuracy of this timescale by (1) comparing the sedimentary cycle patterns with 65°N summer insolation time series of different astronomical solutions and (2) a cross-spectral comparison between the obliquity-related components in the 65°N summer insolation curves and high-resolution paleoclimatic records derived from the same sections used to construct the timescale. Our results show that the carbonate cycles older than 3.5 m.y. should be calibrated to one precession cycle older than previously proposed. Application of the astronomical solution of Laskar [1990] (hereinafter referred to as La90) with present-day values for the dynamical ellipticity of the Earth and tidal dissipation by the Sun and Moon results in the best fit with the geological record, indicating that this solution is the most accurate from a geological point of view. Application of Ber90, or La90 solutions with dynamical ellipticity values smaller or larger than the present-day value, results in a less obvious fit with the geological record. This implies that the change in the planetary shape of the Earth associated with ice loading and unloading near the poles during the last 5.3 million years was too small to drive the precession into resonance with the perturbation term, s6-g6+g5, of Jupiter and Saturn. Our new timescale results in a slight but significant modification of all ages of the sedimentary cycles, bioevents, reversal boundaries, chronostratigraphic boundaries, and glacial cycles. Moreover, a comparison of this timescale with the astronomical timescales of ODP site 846 [Shackleton et al., 1995a, b] and ODP site 659 [Tiedemann et al., 1994] indicates that all obliquity-related glacial cycles prior to ∼4.7 Ma in ODP sites 659 and 846 should be correlated with one obliquity cycle older than previously proposed. © Copyright 1996 by the American Geophysical Union.

Published
1996

22. Late Quaternary central Mediterranean biochronology

Author

Jorissen, F.J., primary, Asioli, A., additional, Borsetti, A.M., additional, Capotondi, L., additional, de Visser, J.P., additional, Hilgen, F.J., additional, Rohling, E.J., additional, van der Borg, K., additional, Vergnaud Grazzini, C., additional, and Zachariasse, W.J., additional

Published
1993
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28. Crustal block movements from Holocene shorelines: Rhodes Island (Greece)

Author

Pirazzoli, P.A., Montaggioni, L.F., Saliège, J.F., Segonzac, G., Thommeret, Y., and Vergnaud-Grazzini, C.

Abstract

Signs of up to eight stepped Holocene shorelines, which have been reported in a previous study on the east coast of Rhodes Island, have been reinvestigated in detail on the basis of a new geomorphological survey, identification and petrological analysis of many new samples of exposed marine organic crusts and over 30 radiocarbon datings.

Published
1989
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