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Accueil du site → Doctorat → Allemagne → 2015 → Origin and characteristics of plant signals in surface and subrecent sediments of the southwest African continental slope.

Universität Oldenburg (2015)

Origin and characteristics of plant signals in surface and subrecent sediments of the southwest African continental slope.

Badewien, Tanja

Titre : Origin and characteristics of plant signals in surface and subrecent sediments of the southwest African continental slope. Auteur : Badewien, Tanja

Université de soutenance : Universität Oldenburg.

Grade : Doktorin der Naturwissenschaften - Dr. rer. nat. - 2015

Résumé
This thesis extends the potentially available information on continental vegetation zones and climatic parameters derived from long chain n-alkanes in geological archives. n Alkane parameters of C3 and C4 plants from Angola were analysed to extend an already compiled end member database and to form a transect in southwestern Africa. The end member data and n alkane data of recent sediments from the southeast Atlantic were used to reconstruct the current continental vegetation distribution. In these sediments, the deuterium content of the n alkanes reflects the deuterium content of the continental precipitation. The analysis of n alkane parameters of a sediment core covering the last 73 ka indicates that the increasing atmospheric CO2 content during deglaciation led to a vegetation change. Smaller vegetation changes during the Late Pleistocene were probably caused by local insolation changes

Mots clés  : Geochemie, n-Alkane, Vegetation, Afrika, Pflanzenwachs

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Page publiée le 17 janvier 2016, mise à jour le 10 mai 2019