Sr and Nd isotope composition of Late Pleistocene sapropels and nonsapropelic sediments from the Eastern Mediterranean Sea: Implications for detrital influx and climatic conditions in the source areas

Détails

ID Serval
serval:BIB_E7589BC88F07
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Sr and Nd isotope composition of Late Pleistocene sapropels and nonsapropelic sediments from the Eastern Mediterranean Sea: Implications for detrital influx and climatic conditions in the source areas
Périodique
Geochimica et Cosmochimica Acta
Auteur(s)
Weldeab S., Emeis K.C., Hemleben C., Vennemann T.W., Schulz H.
ISSN-L
0016-7037
Statut éditorial
Publié
Date de publication
2002
Peer-reviewed
Oui
Volume
66
Pages
3585-3598
Langue
anglais
Résumé
Isotopic ratios of Sr and Nd from lithogenic components of three
isochronous core sections recovered from an east-west transect in the
Eastern Mediterranean Sea (EMS) have been analyzed. The data are used
for a quantitative estimate of the temporal and spatial variation of
detrital flux to the EMS, assuming Saharan dust arid Aegean/Nile
particulate matter as dominant end members. It was established that the
carbonate-free Saharan dust flux during deposition of the nonsapropel
layers of marine oxygen isotope stage 5.4 (MIS 5.4) was similar to the
present flux. During the deposition of sapropels S5 and S6. however. the
Saharan dust input was drastically reduced and was not balanced by a
change in the riverine influx at this time. Denser vegetation cover
during more humid conditions may have reduced physical erosion and
sediment removal in the source area. During marine oxygen isotope stage
6.2 (MIS 6.2) a pronounced increase of Saharan dust and detrital influx
from the Aegean region is evident and implies more and conditions in the
southern and northern catchment areas. During this period, intersite
variations are interpreted in terms of their geographic location
relative to the seaways connecting the Aegean Sea and EMS. The width of
the straits and hence the amount of sediment entering the eastern basins
may have been affected by a low sea level that impeded interbasin
sediment dispersal. Copyright (C) 2002 Elsevier Science Ltd.
Création de la notice
29/09/2012 16:23
Dernière modification de la notice
20/08/2019 16:10
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