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 52, Issue 2
Displaying 1-3 of 3 articles from this issue
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Original Article
  • Distribution and Leaching Properties of Arsenic in Hydrothermally Altered Rock of Nakakoshi Area, Central Hokkaido, Japan
    Teruaki TAKAHASHI, Kensuke FUJII, Toshifumi IGARASHI, Koji KAKETA, Nob ...
    2011 Volume 52 Issue 2 Pages 46-54
    Published: 2011
    Released on J-STAGE: March 31, 2013
    DOIhttps://doi.org/10.5110/jjseg.52.46
    JOURNAL FREE ACCESS
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     Investigation area is located 40 km east of Asahikawa, central Hokkaido, Japan, where the road tunnel approximately 3 km long was constructed. The tunnel passes through the Mesozoic sedimentary rock composed mainly of slate of Hidaka metamorphic belt. The rock distributed from the entrance to 175 m of the tunnel is composed of hydrothermally altered slate. Hydrothermal alteration in this area is accompanied by arsenopyrite. The leached arsenic concentration exceeded 0.01 mg/L in many samples. Arsenic content was high in a vein-type altered zone, such as silicified veins being the main part in the hydrothermally altered zone and contact zones with intrusion of altered andesite. It was also high at local alteration zones away from silicified zones. In particular, the latter zone showed the highest As content. Arsenic in those vein-type altered zones was distributed in sulfides-filled fracture zones and in altered host rock at the contact zones. Arsenic in the contact zones was soluble in water and its concentration after leaching often exceeded 0.01 mg/L, even though the As contents were lower.
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