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The Coalgate Bentonite. A ferriferous-beidellite deposit from Canterbury, New Zealand

Published online by Cambridge University Press:  09 July 2018

J. R. Carlson  and
K. A. Rodgers
J. R. Carlson
Affiliation:
Department of Geology, University of Auckland, Auckland 1, New Zealand
K. A. Rodgers
Affiliation:
Department of Geology, University of Auckland, Auckland 1, New Zealand
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Abstract

The Coalgate Bentonite deposit has been formed by the alteration of cryptocrystalline basaltic ash erupted in Upper Miocene to Pliocene times and deposited in a freshwater lake on a land surface of earlier tholeiitic flows. Physical and chemical analysis shows the bentonite to consist essentially of non-swelling (Ca2+ and Mg2+) ferriferous-beidellite with minor ferriferous montmorillonite. The process of montmorillonitization probably involved a crystal chemical structural reorganization without solution or precipitation and occurred in a mildly alkaline environment in which initial reducing conditions become oxidizing.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 3 , July 1974 , pp. 153 - 172
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1974

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