Relationship between geological structure and helium isotope in deep groundwater from the Osaka Basin: application to deep groundwater hydrology
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- MORIKAWA NORITOSHI
- Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, AIST
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- KAZAHAYA KOHEI
- Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, AIST
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- MASUDA HARUE
- Department of Geoscience, Osaka City University
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- OHWADA MICHIKO
- Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, AIST
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- NAKAMA ATSUKO
- Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, AIST
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- NAGAO KEISUKE
- Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo
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- SUMINO HIROCHIKA
- Laboratory for Earthquake Chemistry, Graduate School of Science, The University of Tokyo
書誌事項
- タイトル別名
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- Relationship between geological structure and helium isotopes in deep ground-water from the Osaka Basin: Application to deep groundwater hydrology
- 公開日
- 2008
- DOI
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- 10.2343/geochemj.42.61
- 公開者
- 一般社団法人日本地球化学会
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説明
The relationship between geological structure and helium isotopes is discussed for deep groundwaters from the Osaka sedimentary basin, southwest Japan, to understand dissolved He in groundwater for hydrological application. Although this area shows no Quaternary volcanic activity, nearly upper mantle-like 3He/4He ratio (1.1 × 10-5) has been observed in the area along the fault system where the basement rocks are outcropped. In contrast, deep groundwaters from the lowest part of the aquifers beneath the Osaka Basin showed a wide variation in 3He/4He ratio (0.27-8 × 10-6), which seems to reflect the geological structure. The moderately high 3He/4He ratios, not as high as those in the mantle value, are due to a contribution of radiogenic 4He within the aquifer. The flux of mantle He through the Uemachi thrust fault into the aquifers in the east block (hanging wall of the fault) of the Osaka Basin will be smaller than those in the west block (foot wall), because mantle He through this fault encountered the aquifers in the west block and dissolved in this aquifer. The model for the Osaka Basin presented in this study implies that there are at least two different sources of He flux into an aquifer; mantle He flux through the fault system and crustal He from the underlying formation. The former should be spatially heterogeneous, while crustal 4He flux is rather spatially constant throughout the lowermost part of the Osaka Basin.
収録刊行物
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- ＧＥＯＣＨＥＭＩＣＡＬ ＪＯＵＲＮＡＬ
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ＧＥＯＣＨＥＭＩＣＡＬ ＪＯＵＲＮＡＬ 42 (1), 61-74, 2008
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679528304128
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- NII論文ID
- 130004469212
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- COI
- 1:CAS:528:DC%2BD1cXlslCltbc%3D
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- ISSN
- 18805973
- 00167002
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
