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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 Cheakamus Valley basalts ： ウィキペディア英語版 Cheakamus Valley basalts The Cheakamus Valley basalts are a sequence of basaltic lava flows at the Cheakamus River in southwestern British Columbia, Canada. They are part of the Garibaldi section of the Cascade Volcanic Arc and were produced during an episode of volcanic eruptions from an unknown vent.〔(Floods, faults, and fire: Geological Field Trips in Washington States and Southwest British Columbia )〕 The latest basaltic eruption deposited wood in lacustrine sediments under the lava flows that have been dated years old.〔 These youngest lavas form isolated ridges above the older glaciated Cheakamus Valley basalts and were described as "esker-like" by Canadian volcanologist Bill Mathews. 〔 Columnar jointing is present all through the most recent basalt lava flow and pillow basalts exist in the lowermost unit, portions of which are underlain by hyaloclastite breccia.〔 Bill Mathews suggested that these esker-like lava flows were deposited during subglacial eruptions that traveled away from the vent inside tunnels or trenches melted in the overlying ice sheet.〔 Mathews based his suggestion on the age of the underlying till, the existence of pillow lava close to the bottom of some lavas that indicate subaqueous volcanism, horizontal jointing at the edges of the lavas that indicate rapid cooling, and the absence of apparent paleotopography to explain these features.〔 ==See also== *Volcanism of Western Canada 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「Cheakamus Valley basalts」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.