ID 62129
タイトルヨミ
トクシマケン アナブキガワ ジョウリュウ コヤダイラ ノ チシツ ト チケイ
タイトル別表記
The geology and geomorphology in Koyadaira, upper stream of Anabukigawa area, East Shikoku, Japan
著者
北村, 真一 徳島大学
元山, 茂樹 徳島市立高等学校
辻野, 泰之 徳島県立博物館
中尾, 賢一 徳島県立博物館
小澤, 大成 鳴門教育大学
キーワード
剣山
御荷鉾緑色岩
秩父北帯
上韮生川-鮎喰川断層
斜面崩壊
資料タイプ
紀要論文
抄録
The Mikabu and Chichibu belts in the Anabukigawa arre were studied with respect to their composition,
boundaries and the relation with landslides. The main body of the Mikabu Greenstones is composed of the
MORB-type tholeiite, and the Hawaiian and Polynesian-type alkaline basalts. The greenstones are dominated by
dolerite intrusions into bedded-cherts. The coincidence of the chemical composition attributes the Taigo and
Nakano greenstone bodies to the Mikabu Greenstones. The limestone phyllite of the Mt. Tsurugi was dated by
the occurrence of Late Carboniferous conodonts. The co-occurrence of conodonts and crinoids suggests that the
limestone originates from the tropical reef settings.The Fujinoike-dani Valley and the southern slope along the
Anabukigawa River are characterized by the frequent occurrence of landslides and collupse of forest road-cuts.
Because the faults,that cut the North Chichibu Belt,an d bounds from the Mikabu Greenstone Belt as well as the
Kaminirogawa-Akuigawa Fault that obliquely cut them later,are concentrated in the Fujinoike-dani Valley and
the southern slope along the Anabukigawa Riiver.The landslides are concentrated along the valley walls of the
Anabukigawa River where Mikabu Greenstones and the Sanbagawa green and pelitic schists occur. The
distribution of landslides in the area is controlled by the lithology (distribution of greenstone and schists),the
coincidence of their dipping with valley wall, the contents of swelling clay minerals in the weathered materials,
and the changes in rock properties of pelitic schists due to weathering.
掲載誌名
徳島大学総合科学部自然科学研究 = Natural Science Research, The University of Tokushima
ISSN
09146385
cat書誌ID
AN10065859
出版者
徳島大学総合科学部
22
開始ページ
29
終了ページ
44
並び順
29
発行日
2008-12-24
EDB ID
191373
フルテキストファイル
言語
jpn
部局
理工学系