GRADISTAT: a grain size distribution and statistics package for the analysis of unconsolidated sediments
Simon J. Blott,Kenneth Pye +1 more
TL;DR: GRADISTAT as discussed by the authors is a computer program for the rapid analysis of grain size statistics from any of the standard measuring techniques, such as sieving and laser granulometry.
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Abstract: Grain size analysis is an essential tool for classifying sedimentary environments. The calculation of statistics for many samples can, however, be a laborious process. A computer program called GRADISTAT has been written for the rapid analysis of grain size statistics from any of the standard measuring techniques, such as sieving and laser granulometry. Mean, mode, sorting, skewness and other statistics are calculated arithmetically and geometrically (in metric units) and logarithmically (in phi units) using moment and Folk and Ward graphical methods. Method comparison has allowed Folk and Ward descriptive terms to be assigned to moments statistics. Results indicate that Folk and Ward measures, expressed in metric units, appear to provide the most robust basis for routine comparisons of compositionally variable sediments. The program runs within the Microsoft Excel spreadsheet package and is extremely versatile, accepting standard and non-standard size data, and producing a range of graphical outputs including frequency and ternary plots. Copyright © 2001 John Wiley & Sons, Ltd.
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References
Brazos River bar [Texas]; a study in the significance of grain size parameters
Robert L. Folk,William C. Ward +1 more
TL;DR: In this paper, a bar on the Brazos River near Calvert, Texas, has been analyzed in order to determine the geologic meaning of certain grain size parameters and to study the behavior of the size fractions with transport.
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A Scale of Grade and Class Terms for Clastic Sediments
TL;DR: In this paper, the problem of terminology in geology has been discussed and the need for greater uniformity of usage and hence much confusion has arisen due to the indiscriminate use of the terms both in the old and new senses.
The Distinction between Grain Size and Mineral Composition in Sedimentary-Rock Nomenclature
TL;DR: In this paper, a system of grain-size nomenclature of terrigenous sediments and sedimentary rocks is introduced wherein fifteen major textural groups are defined on the ratios of gravel, sand, silt, and clay.
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Measures for describing the size distribution of sediments
TL;DR: In this article, the use of five parameters that serve as approximate graphic analogies to the moment measures commonly employed in statistics is recommended, which are computed from five percentile diameters obtained from the cumulative size-frequency curve of a sediment.
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Grain Size Distributions and Depositional Processes
TL;DR: In this article, a genetic interpretation of sand texture is provided based on recognizing sub-populations within individual log-normal grain size distributions, which may be related to a different mode of sediment transport and deposition, thus providing a measure of their importance in the genesis of a sand unit.
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