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Argillation of Three Silicate Rocks Expressed in Terms of Ion Transfer

Published online by Cambridge University Press:  01 January 2024

W. D. Keller ,
G. A. Kiersch  and
Paul Howell
W. D. Keller
Affiliation:
University of Missouri and University of Arizona, USA
G. A. Kiersch
Affiliation:
University of Missouri and University of Arizona, USA
Paul Howell
Affiliation:
University of Missouri and University of Arizona, USA
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Abstract

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The transfer of ions during the weathering of a Medford diabase, a granite from British Guiana, and of the Cheto Arizona tuff is traced by recasting the analyses of the fresh rocks and their altered counterparts into 160-oxygen rock cells, and by comparing algebraically the products of the weathering reaction with the original reactants.

Hydrolysis and hydration are the first steps in the reaction. H ions were added in the weathering environment of the diabase and granite, but Mg ions were added in the change of tuff to bentonite.

Silica and alkali metal ions are dissolved and removed during weathering of the diabase and granite, presumably under acid conditions, but it appears that the Cheto tuff was formed under a non-acid environment where Mg was added. During the hydrolysis of silicate rocks, H ions are concentrated temporarily in the clay minerals on land, while OH ions go to the ocean.

More examples of ion transfer during weathering than the three given herein are needed to define the reactions occurring in the many environments of alteration which rocks encounter.

Type
Article
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 3 , February 1954 , pp. 413 - 420
Copyright
Copyright © The Clay Minerals Society 1954

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