Overview of the clay mineralogy studies presented at the ‘Clays in natural and engineered barriers for radioactive waste confinement’ meeting, Montpellier, October 2012

Landais, P.; Dohrmann, R.; Kaufhold, Stephan

doi:10.1180/claymin.2013.048.2.00

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…Murray 1991Murray , 2000Choy et al, 2007;Carniato et al, 2020), including medicine (Ghadiri et al, 2015;Saadat et al, 2022), pharmaceutics (Carretero & Pozo, 2009;Corbin et al, 2021;Bello et al, 2022), pollution control (Churchman et al, 2006;Ewis et al, 2022), the petroleum industry (Abdo & Haneef, 2013;Li et al, 2023;Salter et al, 2023), and the construction industry (Singh, 2022). It is the exceptional trapping capabilities of smectites that make possible the geological storage of CO 2 or H 2 (Romanov, 2013;Rother et al, 2013;de Jong et al, 2014;Abdulelah et al, 2023;Ho et al, 2023) and radioactive waste (Delage et al, 2010;Landais et al, 2013;Robin et al, 2017;Parrotin et al, 2023). Smectite-rich rocks are also a major reservoir of Rare Earth Elements (Moldoveanu & Papangelakis, 2012;Abbott et al, 2019), and the strong affinities of smectites for organic molecules make them the primary agents for organic carbon sequestration in soils, sediments, and chondrites (Kennedy et al, 2002;Blattmann et al, 2019;Viennet et al, 2023) and the probable main actors of the origins of life (Viennet et al, 2021;Kloprogge & Hartman, 2022).…”

Section: Introductionmentioning

confidence: 99%

Influence of pH on the Hydrothermal Synthesis of Al-Substituted Smectites (Saponite, Beidellite, and Nontronite)

Criouet,

Viennet,

Baron

et al. 2023

Clays and clay miner.

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Smectitic clay minerals are unique indicators of paleoenvironmental conditions and exhibit a unique reactivity in the mineral world. Smectites may exhibit tetrahedral substitutions (Al3+, and sometimes Fe3+, can substitute for Si4+ in tetrahedral sites), resulting in a layer-charge increase, thereby impacting their properties (e.g. swelling and sorption capacities, catalytic properties, expandable abilities). The objective of the present study was to determine the influence of pH conditions on the hydrothermal production of smectite end-members exhibiting tetrahedral Al substitutions (saponite, beidellite, and nontronite), using X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) methods. The results of a series of syntheses conducted at various pH values allowed discussion of the crystallization pathways of these smectites from a mechanistic point of view. Altogether, the present study provided easily reproducible protocols for the hydrothermal production of pure saponite, nontronite, or beidellite (i.e. with no other mineral). The successful synthesis of pure saponite was achieved by exposing the starting gels to 230°C for 4 days in solutions at pH ranging from 5.5 to 14. The successful synthesis of pure beidellite was achieved by exposing the starting gels to 230°C for 9 days in a solution at pH 12. The successful synthesis of pure nontronite was achieved by exposing the starting gels to 150°C for 2.5 days in a solution at pH 12.5. Although extrapolating experimental results to natural settings remains difficult, the results of the present study may be of great help to constrain better the geochemical conditions existing or having existed on extraterrestrial planetary bodies.

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Section: Introductionmentioning

confidence: 99%

Influence of pH on the Hydrothermal Synthesis of Al-Substituted Smectites (Saponite, Beidellite, and Nontronite)

Criouet,

Viennet,

Baron

et al. 2023

Clays and clay miner.

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“…After each of these conferences, a special issue of a journal was published which focused on clay radioactive waste (radwaste), research which has contributed in a significant way to the outstanding scientific level of the research in this field (e.g. Landais & Aranyossy, 2011;Landais et al, 2013;Norris et al, 2014). Therefore, Clay Minerals -Journal of Fine Particle Science, is happy to be able to provide the present compilation of recent HLW-disposal research in clay mineralogy in an open access issue.…”

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confidence: 99%

Overview of the clay-mineralogy studies presented at the ‘Clays in natural and engineered barriers for radioactive waste confinement’ meeting, Brussels, March 2015

Geet

Dohrmann

2016

Clay miner.

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Mineralogical and Isotopic Record of Diagenesis from the Opalinus Clay Formation at Benken, Switzerland: Implications for the Modeling of Pore-Water Chemistry in a Clay Formation

Lerouge

Grangeon

Claret

et al. 2014

Clays and clay miner.

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International audienceArgillaceous rocks are considered to be a suitable geological barrier for the long-term containment of wastes. Their efficiency at retarding contaminant migration is assessed using reactive-transport experiments and modeling, the latter requiring a sound understanding of pore-water chemistry. The building of a pore-water model, which is mandatory for laboratory experiments mimicking in situ conditions, requires a detailed knowledge of the rock mineralogy and of minerals at equilibrium with present-day pore waters. Using a combination of petrological, mineralogical, and isotopic studies, the present study focused on the reduced Opalinus Clay formation (Fm) of the Benken borehole (30 km north of Zurich) which is intended for nuclear-waste disposal in Switzerland. A diagenetic sequence is proposed, which serves as a basis for determining the minerals stable in the formation and their textural relationships. Early cementation of dominant calcite, rare dolomite, and pyrite formed by bacterial sulfate reduction, was followed by formation of iron-rich calcite, ankerite, siderite, glauconite, (Ba, Sr) sulfates, and traces of sphalerite and galena. The distribution and abundance of siderite depends heavily on the depositional environment (and consequently on the water column). Benken sediment deposition during Aalenian times corresponds to an offshore environment with the early formation of siderite concretions at the water/ sediment interface at the fluctuating boundary between the suboxic iron reduction and the sulfate reduction zones. Diagenetic minerals (carbonates except dolomite, sulfates, silicates) remained stable from their formation to the present. Based on these mineralogical and geochemical data, the mineral assemblage previously used for the geochemical model of the pore waters at Mont Tern may be applied to Benken without significant changes. These further investigations demonstrate the need for detailed mineralogical and geochemical study to refine the model of pore-water chemistry in a clay formation

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Overview of the clay mineralogy studies presented at the ‘Clays in natural and engineered barriers for radioactive waste confinement’ meeting, Montpellier, October 2012

Cited by 4 publications

References 19 publications

Influence of pH on the Hydrothermal Synthesis of Al-Substituted Smectites (Saponite, Beidellite, and Nontronite)

Influence of pH on the Hydrothermal Synthesis of Al-Substituted Smectites (Saponite, Beidellite, and Nontronite)

Overview of the clay-mineralogy studies presented at the ‘Clays in natural and engineered barriers for radioactive waste confinement’ meeting, Brussels, March 2015

Mineralogical and Isotopic Record of Diagenesis from the Opalinus Clay Formation at Benken, Switzerland: Implications for the Modeling of Pore-Water Chemistry in a Clay Formation

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