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Published in Soil Sci Soc Am J 37:469-472 (1973)
© 1973 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Concretions: II. Mineralogical Analysis1

R. N. Gallaher, H. F. Perkins, K. H. Tan and D. Radcliffe2

ABSTRACT

Mineralogy of soil concretions, collected from Henry, Iredell, Tifton, and Decatur soils of the southeastern USA, were studied by DTA, X-ray diffraction, and electron microprobe analysis. The results indicated the presence of considerable differences in mineralogical composition of concretions formed under different conditions. Although they were basically composed of 1:1 and 2:1 lattice type of clay minerals, quartz, and feldspars, Iredell soil concretions appeared to contain in addition appreciable amounts of amphibole and goethite compared to concretions of Henry soil. On the other hand Tifton soil concretions were made up of predominantly quartz, some 1:1 lattice type of clay mineral, and sesquioxides including gibbsite and hematite. Concretions from Decatur soil appeared to consist partly of amorphous minerals in addition to material, which exhibited X-ray diffractions characteristic of the mineral psilomelane. It was concluded that Fe-Mn concretions from Henry and Iredell soils had more complex mineralogy than those found in Tifton and Decatur soils. Mineralogy of Fe-Mn concretions of Henry and Iredell soils also revealed less intense soil weathering than was indicated by concretions in Tifton soil that contained plinthite.

NOTES

1 Contribution from the Univ. of Georgia, College of Agr. Exp. Sta., College Station, Athens, Ga. 30601.

2 Graduate Research Assistant, Professor, and Assistant Professor, Dep. of Agronomy, Univ. of Georgia and Senior Geologist, C. E. Minerals, 4020 Lexington Road, Athens, Ga. 30601, respectively.

Received for publication September 18, 1972. Accepted for publication February 22, 1973.






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Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
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Environmental Quality		 The Plant Genome
Copyright © 1973 by the Soil Science Society of America.