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Structural Water in Volcanic Glass

Published online by Cambridge University Press:  28 February 2024

Kazue Tazaki ,
T. Tiba ,
M. Aratani  and
M. Miyachi
Kazue Tazaki
Affiliation:
Department of Geology, Shimane University, Matsue, Shimane, Japan 690
T. Tiba
Affiliation:
National Science Museum, 3-23-1 Hyakunin-cho, Schinjuku-ku, Tokyo, Japan 160
M. Aratani
Affiliation:
The Institute of Physical and Chemical Research, Wako, Saitama, Japan 351-01
M. Miyachi
Affiliation:
General Education, Kyushu University, 4-2-1 Roppon-matsu, Fukuoka, Japan 810
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Abstract

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High-resolution transmission electron microscopy has revealed spherical and hemispherical structures on the surface of partly hydrated volcanic and synthetic glasses. These structures contrast with the bulk of the glass in showing lattice-fringe images indicative of the early stages of crystallization. Heavy-ion Rutherford scattering analysis of the noncrystalline volcanic glass indicates a structural water with hydrogen and deuterium. Depth profiles show that the glass grains contain structural water without adsorbed water on the surface. The presence of structural water in volcanic glass must be of interest to the formation of primitive clays. The spherical and hemispherical structures favor production of clay precursors in the presence of water.

Keywords

GlassHeavy-ion Rutherford scatteringHigh-resolution transmission electron microscopyStructural water
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 1 , February 1992 , pp. 122 - 127
Copyright
Copyright © 1992, The Clay Minerals Society

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