ダウンロード数: 116
このアイテムのファイル:
ファイル | 記述 | サイズ | フォーマット | |
---|---|---|---|---|
mfskugm 057002_001.pdf | 436.27 kB | Adobe PDF | 見る/開く |
タイトル: | Holocene Eruptive Activity Recorded as Volcanic Glass in the Sediments of Beppu Bay, Central Kyushu, Japan |
著者: | Takemura, Keiji ![]() |
著者名の別形: | タケムラ, ケイジ |
発行日: | 31-Oct-1995 |
出版者: | 京都大学理学部 |
誌名: | Memoirs of the Faculty of Science, Kyoto University. Series of geology and mineralogy |
巻: | 57 |
号: | 2 |
開始ページ: | 1 |
終了ページ: | 10 |
抄録: | The eruptive history around Beppu Bay, central Kyushu, Japan, is investigated using a 15 m-long sedimentary core obtained with a piston corer. A standard method to determine the down-hole content of volcanic glass was used in this study. This method consists of two steps: (1) systematic separation of the volcanic glass particles from samples taken at close intervals, and the determination of their relative concentration; (2) precise measurement of the refractive indices of the separated glass particles. A recently developed measuring system (RIMS 86) based on the thermal immersion method permitted quick and accurate measurement of the refractive index of a large number of samples. Five discrete tephras erupted since 7, 500 y B.P. occur within the sedimentary succession underlying Beppu Bay. The oldest tephra is correlated with the widespread K-Ah tephra originating from the Kikai Caldera is southern Kyushu Island. The other four tephras (ca. 5, 000 y B.P., 4, 000 y B.P., 2, 000 y B.P. and 1, 500 y B.P.) are considered to represent eruptives of more proximal volcanoes located in the area surrounding Beppu Bay. |
URI: | http://hdl.handle.net/2433/186677 |
出現コレクション: | Vol. 57 No. 2 |
![](/dspace/image/articlelinker.gif)
このリポジトリに保管されているアイテムはすべて著作権により保護されています。