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  1. 広島大学の刊行物
  2. Journal of science of the Hiroshima University. Series C, Earth and planetary sciences
  3. 11巻1号

Chemical properties of surface waters in the limestone regions of western Japan: Evaluation of chemical conditions for the deposition of tufas

https://doi.org/10.15027/53158
https://doi.org/10.15027/53158
e1c1711c-8a67-429b-a6ab-e02e0fb52219
名前 / ファイル ライセンス アクション
JSHUCE_11-1_11.pdf JSHUCE_11-1_11.pdf (3.0 MB)
Item type デフォルトアイテムタイプ_(フル)(1)
公開日 2023-03-18
タイトル
タイトル Chemical properties of surface waters in the limestone regions of western Japan: Evaluation of chemical conditions for the deposition of tufas
言語 en
作成者 KANO, Akihiro

× KANO, Akihiro

en KANO, Akihiro

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SAKUMA, Koji

× SAKUMA, Koji

en SAKUMA, Koji

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KANEKO, Naotomo

× KANEKO, Naotomo

en KANEKO, Naotomo

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NAKA, Takahito

× NAKA, Takahito

en NAKA, Takahito

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
内容記述
内容記述 In order to understand the chemical conditions for the depositionof tufas, chemical properties of were investigated for the 201 surface waters collected from the limestone regions including newly discovered localities of tufas. The collected waters were categorized, according to the association with tufas, mainly into; category N (waters without tufa deposition), category T (waters depositing tufas), and category S (spring waters of tufa-depositing streams). These three categories clearly differ in Ca contents, equilibrium CO 2 partial pressure (PCO2), and saturation index for calcite (SIC); all of which are the most important chemical properties for the deposition of tufas. The waters of the category N are characterized by small Ca contents (mainly 15~35 ppm) and low PCO2(350~1,000 µatm) which indicate that they are basically flowing on a limestone substrate without an efficient CO2 uptake from soils. Their SIC never exceeds +0.5. The waters depositing tufas (category T) normally exhibitCa contents more than 45 ppm and PCO2 ranging 500~2,000 µatm. The waters of category S show comparable or slightly larger Ca contents than category T, however their PCO2 is considerably higher (than 2,000 µatm). Their raised values of Ca contents and PCO2 are ascribed to efficient CO2 uptake in a soil layer and subsequent dissolution of CaCO3. Furthermore, their SIC around 0.0 indicates that the waters dissolve CaCO3 until they reach the saturation in underground water systems. The large difference in PCO2 between categories T and S results from degassing of CO2 during flowing on the streams. The degassing increases pH and SIC of the waters. The SIC of category T mostly exceeds +0.5, that is probably the most important chemical condition for an efficient deposition of tufas. This study indicates that tufas are not very rare, but also that their distribution tends to be concentrated in a certain area, such as northwestern Okayama Prefecture. Local geological and hydrological conditions can be also important controls for deposition of tufas.
言語 en
出版者
出版者 Hiroshima University
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ departmental bulletin paper
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
ID登録
ID登録 10.15027/53158
ID登録タイプ JaLC
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0075-4374
収録物識別子
収録物識別子タイプ NCID
収録物識別子 AA11095875
開始ページ
開始ページ 11
書誌情報 Journal of science of the Hiroshima University. Series C, Earth and planetary sciences
Journal of science of the Hiroshima University. Series C, Earth and planetary sciences

巻 11, 号 1, p. 11-22, 発行日 1998-03-30
旧ID 53158
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