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Alteration of Smectite in a System Including Alanine at High Pressure and Temperature

Published online by Cambridge University Press:  28 February 2024

Hideo Hashizume ,
Hirohisa Yamada  and
Hiromoto Nakazawa
Hideo Hashizume
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, 305 Japan
Hirohisa Yamada
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, 305 Japan
Hiromoto Nakazawa
Affiliation:
National Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, 305 Japan
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Abstract

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Transformation of montmorillonite was experimentally investigated using a model system of montmorillonite-alanine at 100 MPa and up to 500°C. Sodium-montmorillonite changed to a mixed layer mineral of sodium- and ammoniumn-montmorillonites (Na/NH4-Mnt) in the temperature range from 150 to 400°C. Ammonium ions were the decomposition product of alanine above 150°C. The Na/NH4-Mnt transformed to regularly and randomly interstratified minerals of NH4-montmorillonite and NH4-mica (o. NH4-Mnt/NH4-Mic and d. NH4-Mnt/NH4-Mic) at 400°C. These mixed layered minerals transformed to ammonium-mica at 500°C. Ammonium-analcime appeared and coexisted with the smectites at temperatures over 200°C, and with albite for those over 400°C.

In comparison with the results of previous experiments in which there was no organic component, the present results revealed that (1) some uncommon mineral phases appeared by replacement of sodium ions in montmorillonite with ammonium ions, i.e., NH4-Mic, o. and d. NH4-Mnts, o. and d. NH4-Mnt/NH4-Mics, and (2) ammonium-analcime appeared. The mineral assemblages and alteration sequences correspond better with those observed in the natural system than those known from experimental results in aluminosilicate-water system.

Keywords

AlanineAlbiteAmmonium-analcimeAmmonium-micaAmmonium-montmorilloniteDiagenesisHigh pressureX-ray diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 2 , April 1995 , pp. 184 - 190
Copyright
Copyright © 1995, The Clay Minerals Society

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