About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes
Vol. 69 (1999), No. 3. (May), Pages 546-552

Grain-Size Variation on Dunes in the Southwest Kalahari, Southern Africa

Ian Livingstone (1), Joanna E. Previous HitBullardTop (2), Giles F.S. Wiggs (3), David S.G. Thomas (3)

ABSTRACT

Grain-size parameters (mean, standard deviation, skewness, and kurtosis) were determined for 83 sediment samples from six dune cross-profiles and one 28 km long-profile on dunes in the southwest Kalahari Desert in southern Africa. Although some studies elsewhere and previous studies in the Kalahari have reported significant grain-size variation over dune cross-profiles, data presented here show no systematic variation of grain-size parameters except that sediments from the crest of a dune are almost invariably better sorted (indicated by the standard deviation of the sample) than samples from the base, or plinth, of the dune. The proportion of fines (< 63 µm) in plinth sediments is also greater than in crest samples. There is no significant trend in grain-size parameters along the length of a linear dune. This lack of significant pattern corresponds with similar findings for central Australian dunes.


Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Watermarked PDF Document: $14
Open PDF Document: $24