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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Late Quaternary highstands at Lake Chilwa, Malawi: Frequency, timing and possible forcing mechanisms in the last 44 ka
Quaternary Science Reviews, Volume 28, No. 5-6, Year 2009
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Description
The extensive shoreline deposits of Lake Chilwa, southern Malawi, a shallow water body today covering 600 km2 of a basin of 7500 km2, are investigated for their record of late Quaternary highstands. OSL dating, applied to 36 samples from five sediment cores from the northern and western marginal sand ridges, reveal a highstand record spanning 44 ka. Using two different grouping methods, highstand phases are identified at 43.7-33.3 ka, 26.2-21.0 ka and 17.9-12.0 ka (total error method) or 38.4-35.5 ka, 24.3-22.3 ka, 16.2-15.1 ka and 13.5-12.7 ka (Finite Mixture Model age components) with two further discrete events recorded at 11.01 ± 0.76 ka and 8.52 ± 0.56 ka. Highstands are comparable to the timing of wet phases from other basins in East and southern Africa, demonstrating wet conditions in the region before the LGM, which was dry, and a wet Lateglacial, which commenced earlier in the southern compared to northern hemisphere in East Africa. We find no evidence that wet phases are insolation driven, but analysis of the dataset and GCM modelling experiments suggest that Heinrich events may be associated with enhanced monsoon activity in East Africa in both timing and as a possible causal mechanism. © 2008 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Thomas, David S.G.
United Kingdom, Oxford
University of Oxford
South Africa, Cape Town
University of Cape Town
Bailey, Richard M.
United Kingdom, Oxford
University of Oxford
Shaw, Paul A.
Trinidad and Tobago, St Augustine
The University of the West Indies, St. Augustine Campus
Durcan, Julie A.
United Kingdom, Aberystwyth
Aberystwyth University
Singarayer, Joy S.
United Kingdom, Bristol
University of Bristol
Statistics
Citations: 79
Authors: 5
Affiliations: 5
Identifiers
Doi:
10.1016/j.quascirev.2008.10.023
ISSN:
02773791
Research Areas
Environmental
Study Locations
Multi-countries
Malawi