著者
河野 勝宣 前田 寛之
出版者
The Japan Landslide Society
雑誌
日本地すべり学会誌 : 地すべり = Journal of the Japan Landslide Society : landslides (ISSN:13483986)
巻号頁・発行日
vol.50, no.3, pp.121-129, 2013-05-25
被引用文献数
1

本論文は,北海道黄壁沢-シケレベンベツ川地すべり地域における全斜面の地形,地質,地質構造および熱水変質帯に加えて,岩石の強さを簡便かつ迅速に評価できる不定形点載荷強さ試験に基づく熱水変質岩の力学特性を考慮し,AHP法に基づくランドスライドハザードマップを作成し,ランドスライドハザードアセスメントを試みた。<br>  斜面におけるランドスライド危険度は,素因分析項目からAHP法による評点累計によって評価し,I~Vのハザードランクに分類した。ランクIは安定硬岩盤斜面,ランクIIは安定軟岩盤斜面,ランクIIIは不安定軟岩盤斜面,ランクIVは新規の地すべり発生が懸念される不安定な区域およびランクVは再活動型地すべりが懸念される最も不安定な古期地すべり地である。
著者
米田 哲朗 前田 寛之
出版者
一般社団法人資源・素材学会
雑誌
Journal of MMIJ (ISSN:18816118)
巻号頁・発行日
vol.124, no.12, pp.694-699, 2008-12-25 (Released:2011-02-15)
参考文献数
28
被引用文献数
1 4

Compositional and structural properties of clay minerals from hydrothermal systems show highly diverse and systematic variations related to their localities. The chemical compositions of chlorite, one of the most common clay minerals, are thought to have a close relationship with its formational environments such as geological conditions, temperature, chemistry of hydrothermal solution, etc. In this study two chlorite geothermometers were considered by using the chemical composition of chlorites from some hydrothermal ore deposits in Japan. The two chlorite geothermometers are the Cathelineau's thermometer giving an empirical temperature scale of chlorite formation in an active geothermal field, and the Walshe's thermometer giving a thermodynamic temperature scale based on exchange reactions of chlorite solid solutions. On the basis of a comparison of fluid inclusion geothermometry, it is concluded that the two geothermometers can be applied to different compositional types of hydrothermal chlorite. The Cathelineau's thermometer fits well for Mg-chlorite, and the Walshe's thermometer fits for Fe-chlorite, indicating that both two chlorite geothermometers can be used as exploration indicators for geothermal reservoirs and hydrothermal ore deposits. In addition, it must be emphasized that the impurities in the chlorite should be examined in applying the chlorite geothermometers to chlorites.