Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
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Volume 61, Issue 4
Displaying 1-4 of 4 articles from this issue
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Original Article
  • Lenticular Pores and Groundwater Flow in Sandstone of the Torinosu Formation, Chichibu Belt
    ― An Example in Tosa City, Kochi Prefecture
    Hisao SUNOUCHI, Yuichiro MIYATA, Kazuhiro TANAKA
    2020 Volume 61 Issue 4 Pages 170-182
    Published: October 10, 2020
    Released on J-STAGE: May 02, 2021
    DOIhttps://doi.org/10.5110/jjseg.61.170
    JOURNAL FREE ACCESS
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    Lenticular pores were found in a boring core drilled to 150m depth in sandstone of the Chichibu Belt, Tosa City, Kochi Prefecture. The pores were formed by the dissolution of calcite veins. The pores occur in intervals with high porosity and low P-wave velocity, and they contribute to porosity and water permeability, as their occurrence coincides with the zone of groundwater flow. The results of controlled source audio-frequency magnetotelluric surveys and surface geology surveys indicate the occurrence of NNW-SSE trending faults and fissures near the well. We analyzed the water quality and stable oxygen and hydrogen isotopes of water in wells and of floodwaters near the boring site. We infer that the pores were formed by the dissolution of vein calcite by calcite-undersaturated groundwater that flowed downward along cracks throughout the drainage basin at an elevation of ≧ 300 m, south of the well.

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Serialization Course Key Points of Civil Engineering Geological Investigation in Geological Bodies
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