書誌事項
- タイトル別名
-
- オカヤマケン チュウオウブ サク ゲン チイキ ノ ハクアキ コールドロン
- Cretaceous cauldron in the Yanahara district, Central Okayama Prefecture, SW Japan
- オカヤマケン チュウオウブ ヤナハラ チイキ ノ ハクアキ コールドロン
この論文をさがす
抄録
Cretaceous volcanic rocks (volcanic, pyroclastic and lesser sedimentary rocks) are distributed in the Yanahara area, Okayama Prefecture, eastern Chugoku, SW Japan. Low gravity anomalies concordant with the thick Cretaceous volcanic rocks (Ishikawa et al.,2014) suggest a concealed caldera(cauldron), the infilling of which consists of siltstone, welderd tuff, crystal tuff, rhyolite lava, tuffaceous sandstone, andesite lava, lapillistone and lapilli tuff, in ascending order. The rhyolite lavas laterally attenuate and change to well-bedded rhyolitic lapillistones and tuffaceous sandstones. These volcanic, pyroclastic and epiclastic tuffaceous rocks, which gently incline northward in the main part, shows nearly vertical attitude along the cauldron margin. Namely, they form a half basin plunging north. Some ring dikes of quartz porphyry and andesitic porphyry are also found along the margin, and some fracture zones intercalating fault breccias are observed in the peripheral basement rocks. These structures suggest syn-eruptional subsidence along the boundary faults. The vertical displacement of the marginal fault is estimated more than 1 km by the borehole evidence (MMAJ 1980).
収録刊行物
-
- 島根大学地球資源環境学研究報告
-
島根大学地球資源環境学研究報告 34 51-58, 2016-03-05
島根大学大学院総合理工学研究科地球資源環境学教室
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1050001338486163840
-
- NII論文ID
- 120005749765
-
- NII書誌ID
- AA11455176
-
- ISSN
- 13439774
-
- NDL書誌ID
- 027430266
-
- 本文言語コード
- ja
-
- 資料種別
- departmental bulletin paper
-
- データソース種別
-
- IRDB
- NDL
- CiNii Articles