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Studies of the Clay Fraction of Southwestern Iowa Loess

Published online by Cambridge University Press:  01 January 2024

D. T. Davidson  and
R. L. Handy
D. T. Davidson
Affiliation:
Iowa Engineering Experiment Station, Iowa State College, Ames, Iowa, USA
R. L. Handy
Affiliation:
Iowa Engineering Experiment Station, Iowa State College, Ames, Iowa, USA
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Abstract

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This paper presents data on clay-size material in the loess of southwestern Iowa. Most of the loess samples studied are Wisconsin in age. Regional distribution of clay-size material in the loess is discussed, and data are given on the modes of occurrence of clay in the loess. The following test methods were used to study the clay fractions of selected loess samples: Mechanical analysis, differential thermal analysis, cation-exchange determinations, refractive index determinations, and x-ray diffraction techniques. These tests indicate a uniformity in clay-mineral composition, with montmorillonite and illite group minerals predominating. Clay contents from mechanical analysis are correlated with various properties of the loess; in most cases the properties appear to be linear functions of the clay content. The plastic limit is discussed in detail.

Type
Article
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 2: Publication 327, University of Missouri, Columbia, Missouri, October 15-17, 1953 , February 1953 , pp. 190 - 208
Copyright
Copyright © Clay Minerals Society 1953

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