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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 British Tertiary Volcanic Province ： ウィキペディア英語版 British Tertiary Volcanic Province The British Tertiary Volcanic Province (BTVP), synonymous with the term British Tertiary Igneous Province (BTIP), is a large igneous province formed during a time of intense volcanic activity 52–63 million years ago〔 in Britain in the Paleocene and early Eocene epochs of the Paleogene period. During the breakup of the supercontinent Pangea, as the North American Plate and Eurasian Plate rifted apart to form the North Atlantic Ocean, Britain sat above a mantle plume (hotspot). As the earth's crust was stretched above the mantle hotspot under stress from plate rifting, fissures opened up along a line from Ireland to the Hebrides and plutonic complexes were formed. Hot magma over 1000 °C surfaced as multiple, successive and extensive lava flows covered over the original landscape, burning forests, filling river valleys, burying hills, to eventually form a lava plateau named the Thulean Plateau, which contains various volcanic landforms such as lava fields and volcanoes.〔 There was more than one period of volcanic activity during the BTVP, in between which sea levels rose and fell and erosion took place. ==The BTVP within the Thulean Plateau== The Thulean Plateau, also synonymous with the North Atlantic Igneous Province and the Thulean Province, was a vast basaltic lava plain that possibly extended over 1,800,000 km2 (700,000 sq mi), which was broken up during the formation of the Atlantic Ocean, leaving remnants existing in the BTVP of Northern Ireland, northwestern Scotland and scattered bits in England and Wales, and outside the BTVP in the Faroe Islands, bits of northwestern Iceland, eastern Greenland and western Norway. Extensive outpourings of lava occurred, particularly in East Greenland, which during the Paleogene was then adjacent to Britain. Little is known of the geodynamics of the opening of the North Atlantic between Greenland and Europe, but studies have suggested and are hotly debated, that the modern day Iceland hotspot corresponds to the earlier 'North Atlantic mantle plume' that would have created the Thulean plateau. The BTVP, particularly West Scotland, provides relatively easy access, compared to the largely inaccessible basalt fields of West Greenland, to deeply eroded relics of the central volcanic complexes. So the BTVP is a window into understanding igneous intrusion, evolution of magma, controls of episodic volcanic activity, mechanism and driving force behind ocean opening, hotspot relations to ocean formation.〔 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「British Tertiary Volcanic Province」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.