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dc.contributor.author | Ayliffe, Damien | en |
dc.contributor.author | Williams, Martin Anthony J. | en |
dc.contributor.author | Sheldon, Fran | en |
dc.date.issued | 1996 | en |
dc.identifier.citation | Holocene, 1996; 6(2):157-169 | en |
dc.identifier.issn | 1477-0911 | en |
dc.identifier.uri | http://hdl.handle.net/2440/28225 | - |
dc.description.abstract | The 8500- to 7000-year-old shell-bearing sediments in shallow claypans near Wadi Mansurab in north-central Sudan appear to reflect a widespread and much wetter period in northeast Africa. Stable carbon and oxygen isotope analysis of the Wadi Mansurab gastropods reveals that the shell carbonate is highly depleted in ¹³C and ¹⁸O. The highly depleted oxygen isotopic composition is indicative of rainfall derived from a distant oceanic source. The highly negative nature of the oxygen isotopes indicates that the region had significantly less evaporation than today while the extreme variability in isotopic composition (up to 6-7‰ PDB) is consist ent with a seasonal rainfall regime, characterized by a high degree of inter-annual variability. The dominance of semi-aquatic and swamp-dwelling gastropods over truly aquatic species implies that the region was probably a seasonally flooded grassplain similar to the toich-lands of south-central Sudan today. Our data support the inference that towards 8500-7000 BP there was a stronger southwest monsoon and an associated northward shift in the summer rainfall zone, which caused the Wadi Mansurab region in north-central Sudan to be season ally flooded during a wetter and possibly cooler period with lower rates of evapotranspiration. From 8500 to 7000 BP, lake levels were high elsewhere in northern Africa, suggesting a regionally wetter climate at that time. | en |
dc.description.statementofresponsibility | Damien Ayliffe, Martin A.J. Williams and Fran Sheldon | en |
dc.language.iso | en | en |
dc.rights | © Arnold 1996 | en |
dc.subject | Early Holocene; stable isotopes; 13C; 18O; carbon; oxygen; freshwater mollusca; palaeoenvironments; climatic change; Sudan; north-east Africa | en |
dc.title | Stable carbon and oxygen isotopic composition of early-Holocene gastropods from Wadi Mansurab, north-central Sudan | en |
dc.type | Journal article | en |
dc.contributor.school | Geographical and Environmental Studies | en |
dc.contributor.school | Mawson Graduate Centre of Environmental Studies | en |
dc.identifier.doi | 10.1177/095968369600600203 | en |
Appears in Collections: | Geography, Environment and Population publications |
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