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Cosmogenic 21Ne and 10Be reveal a more than 2 Ma alluvial fan flanking the Cape Mountains, South Africa

Kounov, A. and Niedermann, S. and de Wit, M. J. and Codilean, A. T. and Viola, G. and Andreoli, M. and Christl, M.. (2015) Cosmogenic 21Ne and 10Be reveal a more than 2 Ma alluvial fan flanking the Cape Mountains, South Africa. South African Journal of Geology, 118 (2). pp. 129-144.

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Abstract

Cosmogenic 21Ne and 10Be analyses across a subhorizontal fossil alluvial fan flanking the Cape Mountains near Laingsburg (Western Cape, South Africa) indicate a formation age for this fan of at least 2 Ma. Maximum erosion rates obtained from samples of quartzite ridges protruding through the fan alluvium deposits are very low (<~0.4 m/Ma) and analytically indistinguishable from those derived from pebbles from the fan surface (<~1.5 m/Ma). Our results are consistent with the low denudation rates obtained from other cosmogenic nuclide analyses and predicted by apatite fission-track and offshore sedimentation analyses for southern Africa during the Cenozoic. They integrate already existing substantial evidence to show that relative tectonic stability has prevailed across southern Africa throughout this period, and that the present-day large-scale topography is largely inherited from the Cretaceous and has been only minimally resculptured by denudation during the Cenozoic.
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
Publisher:Geological Society of South Africa
ISSN:1012-0750
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:13 Jun 2018 12:40
Deposited On:13 Jun 2018 12:40

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