青函トンネルのスメクタイトの交換陽性イオン組成と湧水水質との相関性(第2報) : 本州方について

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The measurement of exchangeable cations was carried out on smectites in core samples obtained from the pilot and service tunnels at the Honshu side of the Seikan Undersea Tunnel by means of atomic absorption spectroscopy. The results obtained are as follows : Exchangeable cations of these smectites mainly consist of Sodium, Calcium, and Magnesium, and they can be classified into three types, i.e., (1) Sodium-Magnesium type, (2) Calcium type, and (3) Intermediate type of (1) and (2), based on the exchangeable cation compositions. Sodium-Magnesium smectites are in cation exchange equilibrium with ambient seepage waters corresponding to Present seawater, and Calcium smectites are in equilibrium with those corresponding to Calcium-rich saline water or Sulfate-rich ground water. This fact, as noted already at the Hokkaido side of this tunnel, indicates that the exchangeable cation compositions of smectites are strongly controlled by the chemical compositions of the ambient seepage waters, and that it can be possible to estimate the quality of the ambient seepage waters from the exchangeable cation compositions of smectites.
1982-12-25