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A two-stage model for the formation of clay minerals from tephra-derived volcanic glass

Published online by Cambridge University Press:  09 July 2018

A. P. W. Hodder
Affiliation:
Department of Earth Sciences and Geochronology Research Unit, University of Waikato, Private Bag 3105, Hamilton, New Zealand
B. E. Green
Affiliation:
Department of Earth Sciences and Geochronology Research Unit, University of Waikato, Private Bag 3105, Hamilton, New Zealand
D. J. Lowe
Affiliation:
Department of Earth Sciences and Geochronology Research Unit, University of Waikato, Private Bag 3105, Hamilton, New Zealand

Abstract

The kinetics of clay formation in buried paleosols developed from late Quaternary rhyolitic tephra layers near Rotorua, New Zealand, can be described in terms of a combination of parabolic and linear kinetics, reflecting the hydration of glass, and the formation of clay minerals, respectively. Such a model is consistent with the formation of clay minerals showing an Arrhenian temperature dependence and suggests, on the basis of calculated activation energies, that the process of formation of Al-rich allophane (imogolite) is diffusion controlled, whereas the rate of formation of Si-rich allophane is controlled by the chemical processes at the site of reaction.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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