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Geological Society, London, Special Publications; 1986; v. 25; p. 253-265;
DOI: 10.1144/GSL.SP.1986.025.01.21
© 1986 Geological Society of London

Sedimentary History of African Rift Basins

Palaeoenvironment of Lake Abijata, Ethiopia, during the past 2000 years

R. Bonnefille, C. Robert, A. M. Lezine, G. Perinet, G. Delibrias, C. Elenga, J. P. Herbin & J. J. Tiercelin

Laboratoire de Géologie du Quaternaire, CNRS, Case 907 Luminy, 13288 Marseille, Cedex 9, France
Centre Faibles Radioactivités—CNRS, 91190 Gif-sur-Yvette, France
Ecole Normale Supérieure, 5 rue Boucicaut, 92260 Fontenay-aux-Roses, France
Institut Français du Pétrole, BP18, 92506 Rueil Malmaison, Cedex, France
GIS Océanologie et Géodynamique, Université de Bretagne Occidentale, 29287 Brest, Cedex, France

Multidisciplinary studies, including the examination of sedimentology, palynology, diatoms and organic matter have been undertaken on a 6 m core from Lake Abijata, Ethiopia. The bottom of this core has been dated at 1720 ± BP. Analyses have shown four distinct stages in lake evolution. Two transgressive phases that have been recognized can be correlated with other lake level evidence. The transgressions result from changing inputs from lowland and highland regions within the catchment. They are most probably related to changes in seasonal rainfall patterns.