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White, K., Walden, J. and Gurney, S.D. 2007. Spectral properties, iron oxide content and provenance of Namib dune sands. Geomorphology, 86(3–4): 219–229


Description:

Spectral properties, iron oxide content and provenance of Namib dune sands.

Summary / Notes:

This paper applies multispectral remote sensing techniques to map the Fe-oxide content over the entire Namib sand sea. Spectrometric analysis is applied to field samples to identify the reflectance properties of the dune sands which enable remotely sensed Fe-oxide mapping. The results indicate that the pattern of dune colour in the Namib sand sea arises from the mixing of at least two distinct sources of sand; a red component of high Fe-oxide content (present as a coating on the sand grains) which derives from the inland regions, particularly from major embayments into the Southern African escarpment; and a yellow coastal component of low Fe-oxide content which is brought into the area by northward-moving aeolian transport processes. These major provenances are separated by a mixing zone between 20 km and 90 km from the coast throughout the entire length of the sand sea. Previous workers have also recognised a third, fluvial, provenance, but the methodology applied here is not able to map this source as a distinct spectral component. Keywords: Remote sensing, Iron oxides, Aeolian processes, Namib sand sea.

Year: 2007

Type: Journal Article

URL: http://www.sciencedirect.com/science/article/pii/S0169555X06003990


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