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Clay Mineral Stability and Formation During Weathering

Published online by Cambridge University Press:  01 January 2024

Jack L. Harrison  and
Haydn H. Murray
Jack L. Harrison
Affiliation:
Department of Geology, Indiana University, Bloomington, Indiana, USA
Haydn H. Murray
Affiliation:
Department of Geology, Indiana University, Bloomington, Indiana, USA
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Abstract

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Clay minerals undergo significant changes when exposed to weathering agents. Some of these changes were revealed by studying a sequence of samples collected from weathering profiles developed on shales. Illite and chlorite are modified by the development of expandable layers within the illite and chlorite structures. The suggested mechanism of alteration of chlorite is the oxidation and removal of octahedral iron. Chemical analyses indicate that interlayer potassium is removed from illites. Removal of potassium may be accomplished by an exchange reaction between potassium ions and hydronium ions in the environment.

The origin of underclays is controversial. In an attempt to shed some light on this subject, three shale-underelay profiles were studied. The changes in clay minerals from shales to underelays are very similar to those in weathered shale profiles. This similarity lends support to the theory that some underelays are products of weathering.

Type
Article
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 6 , February 1957 , pp. 144 - 153
Copyright
Copyright © Clay Minerals Society 1957

References

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