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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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.
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|Keywords:||Lake Chad, paleohydrology, remote sensing, geomorphology, climate change, ancient shoreline|
|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%
|Deposited On:||10 Oct 2007|
|Last Modified:||18 Oct 2013 00:23|
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