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Hydrothermal Interaction of Wyoming Bentonite and Opalinus Clay

Published online by Cambridge University Press:  01 January 2024

Kirsten Sauer Open the ORCID record for Kirsten Sauer [Opens in a new window] ,
Florie Caporuscio ,
Marlena Rock ,
Michael Cheshire  and
Carlos Jové-Colón
Kirsten Sauer*
Affiliation:
Los Alamos National Laboratory, EES-14, MS J966, P.O. Box 1663, Los Alamos, NM 87545, USA
Florie Caporuscio
Affiliation:
Los Alamos National Laboratory, EES-14, MS J966, P.O. Box 1663, Los Alamos, NM 87545, USA
Marlena Rock
Affiliation:
Los Alamos National Laboratory, EES-14, MS J966, P.O. Box 1663, Los Alamos, NM 87545, USA
Michael Cheshire
Affiliation:
Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831, USA
Carlos Jové-Colón
Affiliation:
Sandia National Laboratories, 1515 Eubank SE, Albuquerque, NM 87123, USA
*
*E-mail address of corresponding author: sauer@lanl.gov
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Abstract

Most investigations into clay-mineral stability and new mineral formation within engineered barrier system (EBS) materials for geologic repositories of nuclear waste have focused on temperatures <100°C. In response to the United States Department of Energy’s interest in disposing of waste packages with higher thermal loads, higher temperature (200–300°C) and pressure (~150 bar), long-term (6-week to 6-month), hydrothermal experiments were conducted to evaluate the interaction of Opalinus Clay (wall rock) and Wyoming bentonite (clay buffer) with synthetic Opalinus Clay groundwater. Experiments were conducted in autoclaves using a flexible gold reaction cell with water:rock ratios between 6:1 and 9:1. Run products were characterized in terms of mineralogy and geochemistry. Montmorillonite remained stable at 200 and 300°C; traces of illite-smectite interstratified minerals were observed. Clay minerals in Opalinus Clay experienced significant changes at 300°C, including the formation of illite, illite-smectite, and chlorite-smectite. Montmorillonite illitization within the Wyoming bentonite EBS material was likely limited by the bulk chemistry of the system (i.e. low potassium) and newly formed illite was likely limited to the Opalinus Clay fragments, nucleating on pre-existing illite in the clay rock. Zeolite minerals with compositions between analcime and wairakite formed at 300°C along edges of Opalinus Clay fragments and within the bentonite matrix, but not at 200°C. Aqueous fluids remained undersaturated with respect to quartz in Opalinus Clay ± Wyoming bentonite 300°C experiments, and dissolution and re-precipitation of phases such as kaolinite, calcite, and smectite likely contributed to zeolite formation. These results can be applied to understanding zeolite formation, clay-mineral phase stability, and silica saturation within EBS materials of a high-temperature repository.

Keywords

AnalcimeHigh-temperature repositoryHydrothermalMontmorilloniteOpalinus ClayWyoming bentonite
Type
Article
Information
Clays and Clay Minerals , Volume 68 , Issue 2 , April 2020 , pp. 144 - 160
Copyright
Copyright © Clay Minerals Society 2020

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