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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Reddening Of Desert Sands: Simpson Desert, N. T., Australia
ABSTRACT
Measurement of each size fraction with Munsell Color Chart shows that the saltating population (2 to 4.5) has reddest, darkest, and most intense color, averaging 2.5 YR 4/7. Red color in these sands is caused by a hematitic clay cutan formed during Pleistocene lateritization, enhanced by aging, and covered over by a thin silica coat. A Holocene limonitic fluff occurs on top of the silica coat. Coarser grains are yellower because they have more yellow fluff and less red cutan; reg sediments are darker because they contain carbonaceous dots. With aging, sands change from yellow to red and become darker and less intensely colored because of a four-stage process: weathering to limonite, dehydration to diffuse hematite, recrystallizatio
to hematite crystals, and green-darkening. Thus Holocene sands are orange, Pleistocene brick-red, and early Paleozoic dull liver color.
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