The origin and hydrochemistry of deep well waters from the northern foot of Mt. Fuji, central Japan

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  • Yaguchi Muga
    Graduate School of Frontier Sciences, The University of Tokyo
  • Muramatsu Yoichi
    Department of Liberal Arts, Faculty of Science and Technology, Tokyo University of Science
  • Chiba Hitoshi
    Department of Earth Science, Graduate School of Natural Science and Technology, Okayama University
  • Okumura Fumiaki
    Research Center, Japan Petroleum Exploration Co., Ltd.
  • Ohba Takeshi
    Department of Chemistry, School of Science, Tokai University

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Abstract

The major chemical and stable isotopic compositions of hydrogen, oxygen, and sulfur (δD, δ18O, δ34S) were analyzed from water samples of wells and natural springs in the northern foot area of Mt. Fuji and the adjacent Misaka and Tanzawa Mountains to investigate the origin of deep well waters and water-rock interactions that affect the water quality. The water in the samples was considered to have originated through the mixing of meteoric water with very small amounts of altered seawater that had been trapped in the pore spaces in the basement rock, the so-called green tuff formations. The major chemical components of the original waters are considered to be affected by the dissolution of anhydrite and/or gypsum, the weathering of plagioclase, precipitation of calcite, and the cation exchange reaction of smectite. In the distributed volcanic products of Mt. Fuji, the weathering of olivine appears to be an important factor in water quality. The δ34S values of the SO42– ions of well water were higher in the Misaka and Tanzawa Mountains and lower at the foot of Mt. Fuji, indicating the presence of anhydrite/gypsum of different origins.

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