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トカラ列島における中期更新世の酸性海底火山活動
http://hdl.handle.net/2298/18694
http://hdl.handle.net/2298/186947467802f-754c-4252-a505-fd598fb06613
| 名前 / ファイル | ライセンス | アクション |
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119_46.pdf (5.9 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2011-04-28 | |||||
| タイトル | ||||||
| タイトル | トカラ列島における中期更新世の酸性海底火山活動 | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| キーワード | ||||||
| 主題 | 海底火山, 海底カルデラ, トカラ列島, 琉球弧, 中期更新世火山活動, トカラ横ずれ断層, submarine volcano, submarine caldera, Tokara Islands, Ryukyu arc, Mid-Pleistocene volcanism, Tokara strike-slip fault | |||||
| 資源タイプ | ||||||
| 資源タイプ | journal article | |||||
| 著者 |
横瀬, 久芳
× 横瀬, 久芳× 佐藤, 創× 藤本, 悠太× Maria Hannah, T. MIRABUENO× 小林, 哲夫× 秋元, 和實× 吉村, 浩× 森井, 康宏× 山脇, 信博× 石井, 輝秋× 本座, 栄一 |
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| 別言語の著者 |
Yokose, Hisayoshi
× Yokose, Hisayoshi× Sato, Hajime× Fujimoto, Yuta× 小林, 哲夫× 秋元, 和實× Yoshimura, Hiroshi× Morii, Yasuhiro× Yamawaki, Nobuhiro× Ishii, Teruaki× Honza, Eiichi |
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| 内容記述 | ||||||
| 内容記述 | To understand the submarine volcanism surrounding the Tokara Islands, a submarine topographic analysis and 67 dredge samplings were carried out. Prior to the submarine investigations, we reviewed comprehensively geological and geophysical data on this region and confirmed the complexity of both volcanic activity and tectonic setting of the Tokara Islands. In contrast to the homogeneous subaerial volcanic rocks comprising predominantly two-pyroxene andesite lava flows, the dredged samples vary from basaltic andesite to rhyolite in composition. Furthermore, we reveal that dacitic and rhyolitic pumices are abundant and broadly distributed throughout the submarine area. The recovered volcanic rocks were mainly subangular to angular cobble-boulder fragments of lava, scoria, and variably vesiculated pumice. Volcanic rocks with hornblende phenocrysts occur only north of the Tokara strike-slip fault, which is a major tectonic element of volcanism. | |||||
| 内容記述 | ||||||
| 内容記述 | The pumices can be classified into three categories based on the size and abundance of the phenocrysts: aphyric pumice, fine-grained porphyritic pumice, and coarse-grained porphyritic pumice. Occurrences, such as amount in a dredge, shape without extensive abrasion, large fragment size, and bulk rock chemical compositions of the major pumice fragments suggest that they are in situ, rather than originating as drifted pumice or air fall, exotic pyroclastic fragments derived from the four super-eruptions of Kyushu Island. Because dredged samples contained fresh volcanic glass in the groundmass, and are not covered by iron-manganese oxide crust, they appear to have originated from the Quaternary eruptions. Indeed volcanic islands have developed above the submarine erosional terraces (indicated as knick points at approximately 110 m in depth), which is assumed to have formed during the last glacial age. K-Ar age dating on the representative pumice samples resulted in ages of 0.60 ± 0.20 Ma and < 0.2 Ma, respectively. These newly obtained submarine data support that acidic volcanisms occurred around the submarine calderas during the Mid-Pleistocene age. | |||||
| 書誌情報 |
地学雑誌 巻 119, 号 1, p. 46-68, 発行年 2010-05-21 |
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| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00322536 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 関連識別子 | 10.5026/jgeography.119.46 | |||||
| 権利 | ||||||
| 権利情報 | (c) 2010 Tokyo Geographical Society | |||||
| 情報源(ISSN) | ||||||
| 関連名称 | 0022-135X | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 形態 | ||||||
| 5890802 bytes | ||||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 453 | |||||
| その他の言語のタイトル | ||||||
| その他のタイトル | Mid-Pleistocene Submarine Acidic Volcanism of the Tokara Islands, Japan | |||||
| タイトル（ヨミ） | ||||||
| その他のタイトル | トカラ レットウ ニ オケル チュウキ コウシンセイ ノ サンセイ カイテイ カザン カツドウ | |||||
| 出版者 | ||||||
| 出版者 | 社団法人 東京地学協会 | |||||
| 資源タイプ | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 論文(Article) | |||||
| 資源タイプ・ローカル | ||||||
| 雑誌掲載論文 | ||||||
| 資源タイプ・NII | ||||||
| Journal Article | ||||||
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| URL | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | http://www.jstage.jst.go.jp/article/jgeography/119/1/119_46/_article/-char/ja/ | |||||
