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Groundwater Chemistry in Granitic Rcok Area Interpreted in Terms of a Coupled Fluid Flow-Dissolution and Precipitation Kinetics Model
https://doi.org/10.15083/0000032607
https://doi.org/10.15083/0000032607651004f3-5ee6-4414-b531-5a3ce3f53283
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ji0763006.pdf (619.8 kB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2008-05-30 | |||||
| タイトル | ||||||
| タイトル | Groundwater Chemistry in Granitic Rcok Area Interpreted in Terms of a Coupled Fluid Flow-Dissolution and Precipitation Kinetics Model | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Groundwater | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Dissolution rate of feldspar | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Precipitation rate of SiO2 Ground water flow | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Kinetics | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Granite | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Water-rock interaction | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | departmental bulletin paper | |||||
| ID登録 | ||||||
| ID登録 | 10.15083/0000032607 | |||||
| ID登録タイプ | JaLC | |||||
| その他のタイトル | ||||||
| その他のタイトル | 流動-溶解・沈殿カイネティックスモデルにもとづく花崗岩地域の地下水水質の解釈 | |||||
| 著者 |
Shikazono, Naotatsu
× Shikazono, Naotatsu× Fujimoto, Koichiro |
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| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 126169 | |||||
| 姓名 | 鹿園, 直建 | |||||
| 著者別名 | ||||||
| 識別子Scheme | WEKO | |||||
| 識別子 | 126170 | |||||
| 姓名 | 藤本, 光一郎 | |||||
| 著者所属 | ||||||
| 著者所属 | Department of Applied Chemistry, Faculty of Science and Technology, Keio University | |||||
| 著者所属 | ||||||
| 著者所属 | Geological survey of Japan, Ministry of Trade and Industry | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The chemical composition of shallow groundwater in the granitic rock area (Tsukuba-Kaba area, central Japan ; Kamaishi mine, northern Japan) was determined. Thermochemical calculations on the concentrations of Si, Na, K, Ca, H+, and HCO3- in shallow groundwater (Tsukuba-Kaba area, central Japan) in equilibrium with silicate minerals in granitic rocks indicate that the equilibrium between shallow groundwater and silicate minerals (feldspars, kaolinite, amorphous silica) is not attained. Therefore, a coupled fluid flow-dissolution kinetics model was applied to interpret the chemical composition of shallow groundwater. Assuming reasonable values of residence time, solubilities (equilibrium concentration), and dissolution rate of Na-Ca feldspar, the ratio of the surface area of rock to the mass of water (A/M) for shallow groundwater was estimated to be 0.15～8.7. The width of a fracture in a granitic rock is estimated to be 0.2mm～2cm, considering estimated A/M and uncertainty of parameter values. The estimated value of the width is much wider than that obtained by pore sizes experimentally determined using the mercury intrusion method for a hand-specimen scale granitic sample, which is n × 10-1μm. It is suggested that the interaction of groundwater and country rocks takes place dominantly on the surface of a fracture with a width of ca. 2 mm and the chemical composition of groundwater is controlled by such interaction and fluid flow in the fracture. Silica concentration of deep groundwater in the granitic rock area (Kamaishi, northern Japan) is in equilibrium with SiO2 mineral (chalcedony). Based on a coupled fluid flow-dissolution-precipitation kinetics model the relationship between residence time of deep groundwater and A/M was derived, and the residence time for reasonable values of A/M (1) is estimated to be more than 40 years. | |||||
| 書誌情報 |
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo 巻 76, 号 3, p. 333-340, 発行日 2002-02-12 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00408972 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00162258 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 458 | |||||
| 出版者 | ||||||
| 出版者 | 東京大学地震研究所 | |||||
| 出版者別名 | ||||||
| Earthquake Research Institute, University of Tokyo | ||||||
