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Title: 北海道中越地域における鉱化変質作用に伴うヒ素の分布・溶出特性
Other Titles: Distribution and Leaching Properties of Arsenic in Hydrothermally Altered Rock of Nakakoshi Area, Central Hokkaido, Japan
Authors: 高橋, 輝明1 Browse this author
藤井, 研介2 Browse this author
五十嵐, 敏文3 Browse this author →KAKEN DB
掛田, 浩司4 Browse this author
山田, 信行5 Browse this author
Authors(alt): Takahashi, Teruaki1
Fujii, Kensuke2
Igarashi, Toshifumi3
Kaketa, Koji4
Yamada, Nobuyuki5
Keywords: hydrothermal alteration
Issue Date: 10-Jun-2011
Publisher: 日本応用地質学会
Journal Title: 応用地質
Volume: 52
Issue: 2
Start Page: 46
End Page: 54
Abstract: 調査地は,北海道の中央部,旭川市の東約40kmにある上川町中越地域に位置し,日高変成帯の北方延長上にある延長約3kmの道路トンネル建設地である. 地質は粘板岩を主体とする中生代の堆積岩より構成され, 起点坑口から約175mは強い変質の影響を受けている. この変質帯には,ヒ素鉱物として硫砒鉄鉱を伴っている. この変質岩について,土壌汚染対策法に準拠した溶出試験を行った結果,ヒ素溶出量が土壌環境基準を超過した試料が多く認められた. ヒ索は変質中心帯をしめる珪化帯,変質を伴う岩脈の貫入接触部,変質中心帯から離れた外縁の局所的変質帯で全含有量や溶出量が高く,とくに変質を伴った岩脈の貫入接触部で最も高い値を示した. ヒ素はこれらの脈状変質帯に沿い,裂罅を充填する硫化鉱の形態のほか,脈部周辺の変質母岩中に溶出しやすい形態で存在し,全含有量が少ない場合でも土壌環境基準を超える濃度で溶出する場合があった.
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.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 五十嵐 敏文

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