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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Three-Dimensional Shape Analysis of Fine-Grained Sediments
Alan E. Wright
ABSTRACT
A new method of three-dimensional shape measurement of silt particles is presented and methods of analysing the parameters obtained are discussed. The sample is dispersed, placed on a microscope slide, and shadowed with gold in vacuo. Spherical granules are also placed on the slide to enable the shadow angle to be obtained. Several areas on the slide are photographed at large magnifications and measurements made from these photographs under a binocular microscope, the actual measurement being performed at total magnifications of between 3000 and 10,000. Three parameters are found for each particle. Two are measured directly from the photograph and the other calculated from th length of the shadow. The parameters obtained (a>b>c) are plotted as a point for each particle on the chart b/a against c/b. Histograms of shape and sphericity may be derived from this chart.
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