Lake sediment cores from the Antarctic peninsula and surrounding islands
Sediment cores from two lakes on the Antarctic Peninsula, Hidden Lake on James Ross Island and Lake Boeckella in Hope Bay, are described, analysed and dated with regard to climatic changes during the Holocene.
This article contains results from the analysis of a core of 25 m length, drilled in the distal part of the sandur. The stratigraphy of the core is described in general terms with information on bedding, grain size distributions, etc. The content
of diatoms has been analysed, showing that the sediments of the lower part of the core were deposited in a marine environment. The petrographic composition of the core sediments has also been investigated. The sediments are rich in volcanic glass, the origin
This tentative approach shows that freshwater diatoms in Atlantic cores may be a good tool for reconstructing paleoclimates and for establishing continent-ocean correlations if species analyses are made and if the continental distribution
The AA. summarize the benthic foraminiferal zonation of the first piston and gravity cores studied from the continental shelf of eastern Baffin Island and the paleoceanographic implications of the zones for the deglacial and postglacial history
Paleoenvironmental change on the Zaire-Nile ridge in Burundi, the last 20 000 years : an interpretation of palynological data from the Kashiru Core, Ijenda, Burundi in Quaternary and environmental research in East African mountains.
mineralogy, identified by X-ray diffraction. This indicates that higher proportions of bank derived sediment are present in suspension in the waterway during the summer months, due primarily to bank erosion by motor craft. Dated sediment cores show how
ultrabasiques caractérisés par des talus monoclinaux tournés vers la périphérie, la trame tectonique apportant d'autres éléments de différenciation. Il existe une taille limite dans les discontinuités intrusives, la question d'échelle spatio-temporelle