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The weathering of biotite in some Aberdeenshire soils

Published online by Cambridge University Press:  14 March 2018

M. J. Wilson
M. J. Wilson*
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen
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Summary

The weathering of biotite in some freely drained soils developed from a biotite-rich quartz gabbro near Strathdon, Aberdeenshire, has been studied. Using a combination of X-ray, chemical, differential thermal, infra-red, and optical techniques, it was found that the biotite weathers to an intergrade aluminous vermiculite-chlorite together with zones of kaolinite and gibbsite. The crystallographic axes of biotite and included kaolinite are common and parallel and it is proposed that both kaolinite and gibbsite zones crystallized epitaxially within opened out cleavage spaces of the host biotite. The development of kaolinite and gibbsite in this manner could have occurred relatively quickly and the significance of this with regard to generalized pedogenic weathering reactions of biotite is discussed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 276 , December 1966 , pp. 1080 - 1093
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1966

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