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Size measures and the ellipsoidal form of clastic sediment particles

Bingquan Cui and Paul D. Komar
Size measures and the ellipsoidal form of clastic sediment particles
Journal of Sedimentary Petrology (September 1984) 54 (3): 783-797


It is commonly assumed in analyses of grain settling, particle threshold, evaluations of sphericity and in measurements of gravel fabric that particles can be approximated by regular triaxial ellipsoids. This assumption is explored for several data sets including sediment particles ranging in size from sand to pebbles (0.1 mm to 5.5 cm). The true nominal diameter, D (sub n) , calculated from the measured weight or volume, is compared with the nominal diameter of a geometric ellipsoid, D (sub ne) , calculated from its three measured axial diameters. There is a close correspondence for all size ranges, the best agreement being for regular pebbles selected on the basis of their visual similarity with ellipsoids. Grain irregularities cause D (sub ne) to be less than D (sub n) , but even with highly irregular natural sand grains the correspondence remains good. The nominal diameter is also compared with other size measures, including the average of the three axial diameters and the intermediate diameter alone, yielding empirical relationships for the prediction of this important size parameter.

ISSN: 0022-4472
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 54
Serial Issue: 3
Title: Size measures and the ellipsoidal form of clastic sediment particles
Affiliation: Chengdu Geol. Coll., Chengdu, China
Pages: 783-797
Published: 198409
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 21
Accession Number: 1985-035380
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Oreg. State Univ., Sch. Oceanogr., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1985
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