A natural analogue of nuclear waste glass in compacted bentonite

Kamei, Gento; Yusa, Yasuhisa; Arai, Takashi

doi:10.1016/s0883-2927(99)00036-0

Cited by 13 publications

(7 citation statements)

References 17 publications

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“…6c). A similar result was derived from analysis of groundwater within Kazusa Group sediments in the east of the peninsula, where Kamei et al (2000) concluded that the illite-K-feldspar reaction was not in equilibrium with the groundwater and that biota such as seaweed influence the aqueous composition within the K 2 O-H 2 O-SiO 2 system. The data presented in Fig.…”

Section: The Influence Of Rock-forming Minerals On Groundwater Chemistrysupporting

confidence: 65%

“…However, the concentration of H 2 S in this region is generally lower than the detection limit (Tazaki, 1994), although we note that pyrite is common within sedimentary rocks of the study area (e.g., Koma et al, 1989;Kamei et al, 2000). Within ocean sediments, the oxidation of organic compounds occurs by the reduction of ferric iron and sulfur by colorless bacteria, and results in the formation of pyrite.…”

Section: The Influence Of Chemical Reactions On Groundwater Chemistrymentioning

confidence: 68%

“…The significantly large ∆ Na compared to ∆ Mg of sample 22 might be explained by dissolution of Na-montmorillonite. However, only minor montmorillonite has been found in the study area (e.g., Kamei et al, 2000). Another explanation is that the host rock of sample 22 contains Naplagioclase and this type of plagioclase dissolution occurs, inferred from the large ∆ Ca relative to ∆ K and ∆ Mg in sample 22.…”

Section: The Influence Of Chemical Reactions On Groundwater Chemistrymentioning

confidence: 92%

“…Increases in Na and Ca are attributed to the dissolution of plagioclase, while K and Mg increase reflects illite and chlorite dissolution. Only trace amounts of kaolinite have been found in the study area (Kamei et al, 2000), from which clay minerals such as montmorillonite would be the dominant weathering product. The dissolution reactions of the silicate minerals are expressed as follows: …”

Section: The Influence Of Chemical Reactions On Groundwater Chemistrymentioning

confidence: 96%

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Mineralogical and biological influences on groundwater chemistry of the Boso Peninsula, Chiba, central Japan: Implications for the origin of groundwater in sedimentary basins

et al. 2006

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In this study we investigated the geological and biogeochemical processes that influence groundwater chemistry in the Boso Peninsula, Chiba, central Japan. We also discuss the factors that control groundwater chemistry within a sedimentary basin. Saline groundwater is found throughout the study area, while fresh groundwater is distributed unevenly in the central and southern parts of the study area. The distribution of Cl -concentration indicates that groundwater in the study area is influenced by not only present-day seawater penetration but also presence of fossil brine water, although their extents remain uncertain. Since thermodynamic calculation of mineral saturation indices indicates that the groundwater is not in equilibrium with the host rock, it is considered that seawater has intruded to inland areas with and/or after progress of geochemical reactions. Consequently, changes in the concentration of various chemical species by geochemical processes (seawater-freshwater mixing is excluded) were calculated and used as a basis for the classification of samples into six reaction types according to the changing trends of the concentration values calculated by assuming that seasalt components of rainwater affect the groundwater chemistry. Chemical composition is not always correlated with a certain reaction type. The groundwater geochemistry of some reaction types is governed mainly by the dissolution of silicates (plagioclase, illite, chlorite and montmorillonite) and carbonates (calcite, dolomite, and siderite) and precipitation of carbonate minerals, as well as ion exchange of cations. The chemical properties of saline water are influenced by bacterial sulfate reduction, bromine, and the production of methane.

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Section: The Influence Of Rock-forming Minerals On Groundwater Chemistrysupporting

confidence: 65%

Section: The Influence Of Chemical Reactions On Groundwater Chemistrymentioning

confidence: 68%

Section: The Influence Of Chemical Reactions On Groundwater Chemistrymentioning

confidence: 92%

Section: The Influence Of Chemical Reactions On Groundwater Chemistrymentioning

confidence: 96%

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Mineralogical and biological influences on groundwater chemistry of the Boso Peninsula, Chiba, central Japan: Implications for the origin of groundwater in sedimentary basins

et al. 2006

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“…The consequences of glass weathering are hydration of glass and neoformation of zeolites and clay minerals (especially bentonite, a mixture of clay minerals, mostly montmorillonite; e.g. Kamei et al, 2000;Dahlgren et al, 1999;Lowe, 1986). Microprobe chemical analyses of the less weathered glass shards from LAUT1 and LAUT2 show high Al 2 O 3 content and high variability of K 2 O content which prove that these glass shards are weathered.…”

Section: Mineralogymentioning

confidence: 99%

High‐resolution record of environmental changes and tephrochronological markers of the Last Glacial–Holocene transition at Lake Lautrey (Jura, France)

Vannière

Bossuet

Walter-Simonnet

et al. 2004

J Quaternary Science

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Vannière, B., Bossuet, G., Walter-Simonnet, A.-V., Ruffaldi, P., Adatte, T., Rossy, M. and Magny, M. 2004. High-resolution record of environmental changes and tephrochronological markers of the Last Glacial-Holocene transition at Lake Lautrey (Jura, France).ABSTRACT: This paper presents the results of a multiproxy investigation including volume magnetic susceptibility (), mineral and pollen analyses of Late Glacial sediments from Lake Lautrey (Jura, France). Small-scale lithological variations have been identified with high stratigraphic resolution in order to establish lithostratigraphic correlations between cores. measurements, combined with mineralogical analyses, provide information on past sedimentary processes. This combined approach reflects major changes in terrestrial habitats and soil processes which may relate to the climatic events characterising the Late Glacial climatic warming and cooling phases. During warm intervals, the record indicates increased lake productivity via carbonate precipitation and decreased input of detrital material. In contrast, cooler intervals show reduced lake productivity, catchment area instability and increased detrital inputs. Several short interruptions in reforestation and in soil stabilisation can be identified and linked with abrupt colder events occurring through the Bølling. A general trend of warming is recorded from the coldest part of the Younger Dryas. Three tephra layers were also detected. The mineral composition analyses show that the upper tephra layer corresponds to the Laacher See eruption (Eifel, Germany) while the lower ones may relate to the volcanic activity of the Chaîne des Puys (Massif Central, France) around 13 000 cal. yr BP. These two events, recognised for the first time outside the Massif Central region, may provide additional chronostratigraphic markers for the Late Glacial sedimentary records of the Jura mountains and northern Alps.

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Properties of Radioactive Wasteforms

Donald

2010

Waste Immobilization in Glass and Ceramic Based Hosts

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A natural analogue of nuclear waste glass in compacted bentonite

Cited by 13 publications

References 17 publications

Mineralogical and biological influences on groundwater chemistry of the Boso Peninsula, Chiba, central Japan: Implications for the origin of groundwater in sedimentary basins

Mineralogical and biological influences on groundwater chemistry of the Boso Peninsula, Chiba, central Japan: Implications for the origin of groundwater in sedimentary basins

High‐resolution record of environmental changes and tephrochronological markers of the Last Glacial–Holocene transition at Lake Lautrey (Jura, France)

Properties of Radioactive Wasteforms

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