Some Factors Controlling Chemical Compositions of Groundwater in the. Shimousa Upland

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  • MURAMATSU Yoichi
    Department of Liberal Arts, Faculty of Science and Technology, Tokyo University of Science
  • SHIBATA Yasuhiro
    Graduate School of Science and Technology, Tokyo University of Science
  • WATANABE Kunihiro
    Graduate School of Science and Technology, Tokyo University of Science
  • ITAGAKI Masayuki
    Department of Pure and Applied Chemistry, Faculty of Science and Technology Tokyo University of Science

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Other Title
  • 下総台地における地下水の水質とその要因
  • 下総台地における地下水の水質とその要因--千葉県野田市南部地域の予察例
  • シモウサ ダイチ ニ オケル チカスイ ノ スイシツ ト ソノ ヨウイン チバケン ノダシ ナンブ チイキ ノ ヨサツレイ
  • 千葉県野田市南部地域の予察例
  • Preliminary Case Study of the Southern Area of Noda City, Chiba

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Abstract

Chemical compositions of thirteen g r o und and spring waters, and alteration minerals from aquifers above 100 m depth were analyzed to clarify the water-mineral interactions conducted to the chemical composition of the waters in the southern area of Noda city, Chiba, Japan. There are three aquifers (the first, second and third aquifers) whose water compositions are Ca-HCO3 type. Ca2+ and HCO3- contents gradually increase with depth. Saturation indices of aragonite and calcite, and pH of the waters gradually increase with depth. Kaolinite and plagioclase are found in the aquifers. Based on these data and presence of shell fossils in the Kioroshi and Kamiiwahashi Formations, the increases of Ca2+ and HCO3- contents with depth are mainly interpreted by the following tw o mechanisms: (1) dissolutions of calcite and aragonite as the shell fossils, and (2)formation of kaolinite by weathering of plagioclase.

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