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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Ocean island basalt ： ウィキペディア英語版 Ocean island basalt Ocean island basalts or OIBs are basaltic rocks found on many volcanic islands away from tectonic plate boundaries typically associated with hot spots. Islands hosting ocean island basalts always lie above the oceanic crust and are not limited to volcanic islands but occur also on volcanoes of any size under the sea. The chemical composition of these basalts can vary from tholeiite to alkali basalt within the same island group, but is never calc-alkaline. During the shield volcano stage of many hotspot islands, tholeiitic OIBs build up most of the volcano's structure. Following the post-erosional stage this is usually accompanied by violent eruptions of alkali basalt and other more evolved volcanic rocks with high alkali content. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ocean island basalt」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.