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Rock uplift rates in South Africa from isochron burial dating of fluvial and marine terraces (2012)

Erlanger, E. D., Granger, D. E., Gibbon, R. J.

Geological Society of America (GSA)

In: Geology

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Publication Date: 2012-11-01

Description: The high plateau of southern Africa is considered to be either uplifting due to mantle-driven dynamic topography, or to have been stable since Mesozoic rifting. To address this debate, we determined rock uplift in South Africa from the long-term incision rate of the Sundays River, near Port Elizabeth, and from an uplifted marine terrace near Durban. We dated the terraces with cosmogenic 26 Al and 10 Be, using both isochron and simple burial dating methods. We find that the Sundays River has incised at 16.1 ± 1.3 m/m.y. for the past ~4 m.y., and the marine terrace yields a rock uplift rate of 9.4 ± 2.2 m/m.y. These results are inconsistent with rapid Neogene uplift.

Print ISSN: 0091-7613

Electronic ISSN: 1943-2682

Topics: Geosciences

Published by Geological Society of America (GSA)

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