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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 Yellowstone Plateau ： ウィキペディア英語版 Yellowstone Plateau The Yellowstone Plateau volcanic field is a geological feature found in the U.S. state of Wyoming. It is a popular site for tourists. The plateau developed through three volcanic cycles spanning two million years that included some of the world's largest known eruptions. Eruption of the > Huckleberry Ridge Tuff about 2 million years ago created the more than long Island Park Caldera. The second cycle concluded with the eruption of the Mesa Falls Tuff around 1.3 million years ago, forming the wide Henry's Fork Caldera caldera at the western end of the first caldera. Activity subsequently shifted to the present Yellowstone Plateau and culminated 630,000 years ago with the eruption of the Lava Creek Tuff and the formation of the present caldera. Resurgent doming then occurred at both the NE and SW sides of the caldera and voluminous intracaldera rhyolitic lava flows were erupted between 150,000 and 70,000 years ago. Phreatic eruptions produced local tephras during the early Holocene. The caldera presently contains one of the world's largest hydrothermal systems including the world's largest concentration of geysers. Much of the plateau is located within Yellowstone National Park. ==References== 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「Yellowstone Plateau」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.