Abstract
ABSTRACT Medium quartz sand derived from the Medina and Oriskany Sandstones was tumbled in the laboratory. These sands, as well as the fine sand and coarse silt produced by tumbling, were characterized using petrographic, SEM, Fourier, and oxygen isotopic composition analyses. The original Medina and Oriskany medium sand had 18O values of 13.6 and 14.0 per mil, respectively. This sand was irregular in shape, and overgrowths with crystal faces were common. Tumbling medium Medina and Oriskany sand produced fine sand that was rounded and had lower 18O values (12.3 and 12.8 per mil, respectively) and silt that was angular, commonly displayed crystal faces, and had hig er 18O values (14.3 and 14.9 per mil, respectively). These results indicate that the silt was produced by spalling quartz overgrowths. This process was more efficient for the Medina sand, in which dust coatings were well developed.
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