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• W2163380799 abstract "Abstract Africa’s landscape is dominated by a manifold of second-order epeirogenic structures superimposed on a first-order bimodal topography. Bivariate regression analysis of Africa’s surface topography shows that this is a complexly folded surface with regionally elevated areas in southern and eastern Africa, and a topographically low northern and western Africa. The apparent spatial relationships between these features are analysed using anomaly correlation between surface topography and free-air gravity anomalies. Occurrences of positively correlated features between gravity and topography in Africa are found to be limited to second-order epeirogenic features. Geophysical modelling and geologic evidence indicate that Africa’s bimodal topography is genetically distinct from these second-order features, and linked to sources as deep as the sublithospheric mantle. The age, measured and modelled elevation of the bimodal topography require that topographic uplift of south-central Africa be episodic. We infer from our findings together with relative sea-level changes, that the near-bimodality of Africa’s topography is an ancient feature inherited at least from upper Paleozoic times. Our reconstructed paleotopography suggests that Africa was largely a low-lying continent dominated by its cratons, and that basement distribution disregards the present-day uplift patterns of Africa." @default.
• W2163380799 created "2016-06-24" @default.
• W2163380799 creator A5073181000 @default.
• W2163380799 creator A5084016293 @default.
• W2163380799 date "2003-05-01" @default.
• W2163380799 modified "2023-09-23" @default.
• W2163380799 title "Old inherited origin for the present near-bimodal topography of Africa" @default.
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• W2163380799 doi "https://doi.org/10.1016/s0899-5362(03)00019-8" @default.
• W2163380799 hasPublicationYear "2003" @default.
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