Soil Concretions: I. X‐Ray Spectrograph and Electron Microprobe Analyses

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Abstract
X‐ray spectrographic analyses of soil concretions collected in Georgia and Tennessee from different soil parent material and moisture regimes indicated wide variation in chemical composition. Analyses showed higher concentrations of Mn and Ba in the inner core than in the outer layer of Fe‐Mn concretions from Henry and Iredell soils. A larger concentration of Fe and Ti was found in the outer layer as compared to the inner core. Distribution of Mn, Ba, Fe, and Ti indicated that they were accumulated by a similar mechanism in Henry and Iredell Fe‐Mn concretions. Concretions from the Tifton soil were composed of randomly distributed quartz grains cemented by Fe, Al, and Si oxides; whereas, those from the Decatur soil consisted of a homogenous mixture of Mn and Ba oxides. Electron probe micrographs supported the indication that elemental distribution within concretions differed as a result of weathering conditions at different geographic locations.

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