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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
The Effects of Wind Transport on the Shapes of Quartz Silt Grains
Jim Mazzullo, Andrew Alexander (2), Thomas Tieh (2), Ding Menglin (3)
ABSTRACT
Wind-blown terrigenous silt is a common component in marine sediment, but it is often difficult to distinguish from fluvial silt. A field experiment was conducted in the Loess Plateau of China to determine the effect of eolian transport on the shapes of detrital quartz silt grains and to define grain-shape criteria for the recognition of eolian silt. The results show that eolian transport results in a rapid downwind increase in the roundness of quartz silt grains, and that this increase in roundness is apparently due to preferential transport, or shape-sorting, of more rounded grains. This capacity for shape-sorting distinguishes eolian from fluvial transport, which has no great effect upon the shapes of quartz silt grains, and provides a petrographic criteria for the distinction of t e eolian and fluvial silt components in marine sediments.
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