Factors affecting the nature and rate of dust production from natural dune sands

Bullard, Joanna E. and McTainsh, Grant H. and Pudmenzky, Christa (2007) Factors affecting the nature and rate of dust production from natural dune sands. Sedimentology, 54 (1). pp. 169-182. ISSN 0037-0746

Abstract

This paper evaluates the influence of natural sand particle characteristics on the amount and particle-size distributions of dust produced by aeolian abrasion. It contrasts with previous studies of aeolian abrasion by conducting experiments using: (i) whole sand samples, as opposed to selected size fractions; (ii) natural, mature dune sands, rather than artificial or freshly crushed material; and (iii) weathered sands that have acquired a superficial clay coating, instead of grains with clean surfaces. Whilst previous research has found clear, positive relationships between particle size, sorting, roundness and the amount of dust produced by aeolian abrasion, the relationships determined in this study show some variation according to the geomorphological context from which the original samples were obtained. The most important factor affecting the amount and particle-size characteristics of the dust produced was the presence of a clay coating on the grain surface that is removed by the abrasion process. The dust produced by this mechanism had a modal size of 2–5 µm and material <10 µm comprised up to 90% of the particles produced.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Depositing User: Ms Christa Pudmenzky
Faculty / Department / School: Historic - Faculty of Sciences - No Department
Date Deposited: 17 Oct 2011 10:28
Last Modified: 03 Jul 2013 00:48
Uncontrolled Keywords: aeolian abrasion, dune sands, dust production, grain characteristics, iron oxide
Fields of Research (FOR2008): 04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040601 Geomorphology and Regolith and Landscape Evolution
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040607 Surface Processes
04 Earth Sciences > 0403 Geology > 040310 Sedimentology
05 Environmental Sciences > 0503 Soil Sciences > 050302 Land Capability and Soil Degradation
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9609 Land and Water Management > 960910 Sparseland, Permanent Grassland and Arid Zone Land and Water Management
Identification Number or DOI: doi: 10.1111/j.1365-3091.2006.00827.x
URI: http://eprints.usq.edu.au/id/eprint/19755

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