書誌事項
- タイトル別名
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- Geochemical Trapping of CO2 in Basaltic Aquifers: Implications from CO2-Water-Rock Interaction Experiments
- 玄武岩質帯水層内でのCO2地化学トラッピング--CO2-水-玄武岩反応実験からの示唆
- ゲンブガンシツ タイスイソウ ナイ デ ノ CO2チ カガク トラッピング CO2 ミズ ゲンブガン ハンノウ ジッケン カラ ノ シサ
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Quite recently, a basaltic aquifer receives particular attention as a suitable candidate for CO2 aquifer storage because basaltic rocks contain high concentrations of Ca, Mg, and Fe that can enhance CO2 geochemical trapping via acid neutralization and carbonate mineral formation. Despite the increasing interest in basaltic aquifer CO2 storage, there are few experimental researches on CO2-water-basalt interaction. In addition, the influence of rock alteration on the geochemical trapping processes has not been considered. In this study, therefore, we conducted CO2-water-basalt interaction experiments using three types of fresh to altered basaltic rocks.<BR>The fresh basalt (non-altered basalt) is composed of olivine, plagioclase, and basaltic glass. On the other hand, the basic schist (high-T altered basalt) completely consists of secondary greenschist minerals (albite, epidote, chlorite, actinolite, quartz) , and the seamount basalt (low-T altered basalt) is mainly composed of secondary clay minerals (celadonite, smectite, Fe-oxyhydroxide) . In our experiments, the cations eluted from fresh basalt and basic schist are mostly Mg and Na, while the fluids reacting with seamount basalt contain large amount of Na and K with noticeably higher pH. This suggests that Na and K eluted from clay minerals play an important role in acid neutralization. Our experiments further demonstrate that, regardless of alteration types, a Na-dominant condition emerges at an early stage of the CO2 storage in a basaltic aquifer, leading to dawsonite (NaAlCO3 (OH) 2) precipitation. The present findings lead us to propose a new perspective on carbonate formation sequence of dawsonite → siderite → calcite/dolomite in basaltic aquifers.
収録刊行物
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- 資源と素材
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資源と素材 126 (4/5), 131-137, 2010
一般社団法人 資源・素材学会
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詳細情報 詳細情報について
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- CRID
- 1390001205276141952
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- NII論文ID
- 10026215690
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- NII書誌ID
- AA12188381
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- ISSN
- 18840450
- 18816118
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- NDL書誌ID
- 10632652
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可
