直近一年間の累計
アクセス数 : ?
ダウンロード数 : ?
ID 117533
タイトル別表記
The Mikabu and Chichibu belts in the Iya-gawa area, Tokushima Prefecture, Shikoku, SW Japan : An integrated research of geology and geomorphology
著者
中尾, 賢一 徳島県立博物館
元山, 茂樹 徳島市立高等学校
高谷, 精二 南九州大学
香西, 武 鳴門教育大学
小澤, 大成 鳴門教育大学
キーワード
terrane analysis
Mikabu Greenstone
North Chichibu Belt
landslide
swelling clay
environmental geology
Iya-gawa River
Tokushima Prefecture
資料タイプ
紀要論文
抄録
The Mikabu and Chichibu belts in the Iya-gawa area are studied with respect to their composition, boundaries and the relation with landslides. The Kyobashira-Sugeoi Fault bound the Mikabu Greenstone Belt from the Sambagawa Belt. The Kubo Greenstone body, a part of the Mikabu Greenstone, distributes as an axial part of antiform in the southern margin of the Sambagawa Belt. The Mikabu Greenstone of the area is composed of tholeiitic and alkaline rocks. The Mikabu Greenstone thrust to the south with the Okoyatoko-Nagoro Fault upon the Jurassic accretionary complex of the North Chichibu Belt. Even the phillite generally dipping towards the north in the northern part of the North Chichibu Belt, the oceanic-plate successions of chert-mudstone sequences are stratigraphically upper towards the south. The radiolarian age, estimated at the lithological transition from chert to mudstone in the oceanic-plate sequences, is Early Jurassic. The landslides concentrate in the areas of the Mikabu Greenstone and valley walls along the Iya-gawa River. The linear depressions and ponds, arrange on the mountain ridge between the Miune and Tengu-Zuka along the southern border of the Mikabu Greenstone, are regarded as a sign of large-scale collapse by long-period gravitational mass rock deformation of the mountain body. The weathered zone of the Mikabu Greenstone often includes swelling clay that causes landslides in the area.
掲載誌名
自然科学研究
ISSN
09146385
cat書誌ID
AN10065859
出版者
徳島大学総合科学部
21
開始ページ
47
終了ページ
64
並び順
47
発行日
2007-12-21
EDB ID
フルテキストファイル
言語
jpn
著者版フラグ
出版社版
部局
理工学系