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Present denudation rates at selected sections of the South Afircan escarpment and the elevated continental interior based on cosmogenic 3He and 21Ne

Kounov, A. and Niedermann, S. and de Wit, M. J. and Viola, G. and Andreoli, M. and Erzinger, J.. (2007) Present denudation rates at selected sections of the South Afircan escarpment and the elevated continental interior based on cosmogenic 3He and 21Ne. South African journal of geology, Vol. 110. pp. 235-248.

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Official URL: http://edoc.unibas.ch/dok/A4999090

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Abstract

Measurements of cosmogenic He-3 and Ne-21 concentrations in dolerite and quartzite samples front selected sites across the South African coastal escarpment and the interior plateau provide valuable estimates of the short-term (i.e., a few hundred thousand years) denudation rates. Present-day denudation rates at the summit of the escarpment and on the inland plateau are more than an order of magnitude lower than those in the Cretaceous. Values between 1.0 and 2.1 m/Ma obtained from resistant quartzite samples and between 1.5 and 3 m/Ma from dolerite sills suggest a strong lithology control on the erosion. The observed patterns of denudation across different landform sites on the high plateau and along its flanking escarpment suggest that the morphology of the sampling sites together with the local climate conditions have controlled the denudation processes.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geologie-Paläontologie > Tektonik (nn)
UniBasel Contributors:Kounov, Alexandre
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Geological Society of South Africa
ISSN:0371-7208
Note:Note: Zugleich als Sonderdruck erschienen -- Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Mar 2012 14:31
Deposited On:22 Mar 2012 14:18

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