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Geological Society, London, Special Publications; 1999; v. 153; p. 41-53;
DOI: 10.1144/GSL.SP.1999.153.01.03
© 1999 Geological Society of London

The Geological and Geophysical Framework

The Mesozoic denudation history of the Atlantic margins of southern Africa and southeast Brazil and the relationship to offshore sedimentation

Kerry Gallagher1 & Roderick Brown2

1 T. H. Huxley School of Environment, Earth Science and Engineering, Imperial College of Science, Technology and Medicine, South Kensington, London SW7 2AS, UK
2 Department of Earth Sciences, La Trobe University, Bundoora, Victoria, 3083, Australia

A new interpretation of regional apatite fission track data suites from western southern Africa (South Africa, Namibia) and southeast Brazil, in terms of the post-break-up denudation chronologies, is presented. The data reveal that although significant denudation occurs parallel to the present-day margin (associated with the inland escarpment) there are regional variations along-strike and with time. Moreover, the data reveal a significant amount of post-break-up denudation from within the continental interior of southern Africa. The data indicate relatively little post-rift denudation but the rates increase dramatically in both regions in the late Cretaceous-Early Tertiary, more than 50 Ma after initial rifting. The inferred denudation chronologies are broadly consistent with the sedimentary record in the offshore basins, which can show increases in sedimentation rate, contemporaneous unconformities and major changes in depositional character.





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