Abstract
Local, proximal and distal dusts are mainly distinguished by their grain-size distributions in relation to the distance from their desert sources. The coarse particles have an inherited micromorphology derived from the incipient eolian mobilization in the source area. This is shown by SEM examination, image analysis and correspondence factor analyses. Yet, mineralogical identification may be difficult for the finest dust particles. In the presently deposited dusts or trapped dusts in the rock cracks, the grain-size and micromorphological characters, inherited from the previous eolian phase, are well-preserved.
According to the correspondence factor analyses, mineralogical alterations can occur after deposition. Micromorphological and mineralogical markers, such as reddened desert quartz or wind-shaped palygorskite grains, which are well characterized in present atmospheric dusts, are good indicators of Saharan dust contribution in peridesert soils and deposits and in several terrestrial and marine sediments.
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Coudé-Gaussen, G. (1989). Local, Proximal and Distal Saharan Dusts: Characterization and Contribution to the Sedimentation. In: Leinen, M., Sarnthein, M. (eds) Paleoclimatology and Paleometeorology: Modern and Past Patterns of Global Atmospheric Transport. NATO ASI Series, vol 282. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0995-3_14
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DOI: https://doi.org/10.1007/978-94-009-0995-3_14
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