青函トンネルのスメクタイトの交換性陽イオン組成と湧水水質との相関性 (第1報) : 北海道方について

概要

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The measurement of exchangeable cations was tarried out on smectites in core samples obtained from the pilot and service tunnels at the Hokkaido side of the Seikan Undersea Tunnel by means of atomic absorption spectroscopy. It is found that exchangeable cations of these smectites mainly consist of Sodium, Calcium, and Magnesium, and that these smectites 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 sea-water or Magnesium-rich seawater, and Calcium smectites are in equilibrium with those corresponding to Calcium-rich saline water or Sulfate-rich ground water. From this investigation, it is recognized that the exchangeable cation compositions of smectites are strongly controlled by the chemical compositions of the ambient seepage waters.
1982-06-25