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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 Maitland Volcano ： ウィキペディア英語版 Maitland Volcano Maitland Volcano is a former shield volcano that resided in the Northern Interior of British Columbia, Canada. It was located southeast of the small community of Telegraph Creek in what is now the Klappan Range of the northern Skeena Mountains. This multi-vent volcano covered a remarkably large area and was topped by a younger volcanic edifice. Little remains of Maitland Volcano today, limited only to eroded lava flows and distinctive upstanding landforms created when magma hardened within the vents of the volcano. The shield was associated with an extensive group of related volcanoes called the Northern Cordilleran Volcanic Province (NCVP). This forms part of the much larger Ring of Fire, which surrounds most of the Pacific Ocean basin. Geologic studies have shown that Maitland was a comparatively short-lived volcano. It had volcanic activity for less than a million years, a time span unique from other massive NCVP shields. The volcano is known to have produced at least four types of lava, namely alkali basalt, hawaiite, trachyte and trachybasalt. These have been studied by scientists since the 1950s. ==Geology== Maitland Volcano was one of the most voluminous shield volcanoes in the Northern Cordilleran Volcanic Province along with Heart Peaks, Level Mountain and the Mount Edziza volcanic complex.〔 Its structure was about long and wide, covering an area of at least .〔〔 This is similar in size to the Mount Edziza complex approximately west of Maitland Volcano. Like most shields, Maitland consisted of several basaltic lava flows which have low viscosity.〔 This gave the volcano its massive profile and consequently Maitland might have had a broad lava plateau like other large NCVP shields.〔 Like other Northern Cordilleran volcanoes, Maitland Volcano had its origins in continental rifting—a long rupture in the Earth's crust where the lithosphere is being pulled apart. This incipient rifting formed as a result of the Pacific Plate sliding northward along the Queen Charlotte Fault, on its way to the Aleutian Trench. As the continental crust stretched, the near surface rocks fractured along steeply dipping cracks parallel to the rift known as faults. Basaltic magma rose along these fractures to create effusive eruptions. The rift zone has existed for at least 14.9 million years and has created the Northern Cordilleran Volcanic Province. This geologic province forms part of the Ring of Fire, an area where large numbers of earthquakes and volcanic eruptions occur along the Pacific Ocean. 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「Maitland Volcano」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.