Evidence for Megalake Chad, north-central Africa, during the late Quaternary from satellite data

Leblanc, Marc, Leduc, Christian, Stagnitti, Frank, van Oevelen, Peter J, Jones, Christopher, Mofor, Linus A, Razack, Moumtaz, and Favreau, Guillaume (2006) Evidence for Megalake Chad, north-central Africa, during the late Quaternary from satellite data. Palaeogeography, Palaeoclimatology, Palaeoecology, 230 (3-4). pp. 230-242.

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Abstract

The existence of a very large Lake Chad during the late Quaternary, Megalake Chad, has long been questioned. A Megalake Chad would present strong evidence for climatic fluctuations of great magnitude during the Holocene in tropical Africa. In this paper we used satellite data from Landsat and Modis sensors to collect and analyse new information on landforms in a 2000000 km2 region of the Lake Chad Basin. We detected 2300 km of remains marking the ancient shoreline of Megalake Chad. The satellite data also indicated many Saharan rivers and relict deltas leading to the long paleoshoreline. Large dunefield flattenings were observed and interpreted as the result of wave-cut erosion by the paleolake. Similarities were noticed between the landforms observed along the paleoshoreline of Megalake Chad and that of the former Aral Sea. This finding has significant consequences for reconstructing paleohydrology and paleoenvironments through the Lake Chad basin, and continental climate change.

Item ID: 1719
Item Type: Article (UNSPECIFIED)
Keywords: Lake Chad, paleohydrology, remote sensing, geomorphology, climate change, ancient shoreline
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ISSN: 1872-616X
Date Deposited: 10 Oct 2007
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences @ 0%
04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040608 Surfacewater Hydrology @ 0%
04 EARTH SCIENCES > 0403 Geology > 040308 Palaeontology (incl Palynology) @ 0%
Citation Count from Web of Science Web of Science 25
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