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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 Jan Mayen Microcontinent ： ウィキペディア英語版 Jan Mayen Microcontinent The Jan Mayen Microcontinent is a fragment of continental crust within the oceanic part of the western Eurasian Plate lying northeast of Iceland. At the onset of separation between the Greenland and Eurasian plates 55 million years ago, it formed part of the eastern margin of the Greenland Plate. Propagation of a new spreading center from the Reykjanes Ridge separated this microcontinent from the Greenland Plate. For a short period it formed a microplate, until the Aegir Ridge became inactive, after which it formed part of the Eurasian Plate. The island of Jan Mayen is a much younger feature, formed of volcanic rock, built up at the northernmost tip of the microcontinent. ==Extent== The microcontinent extends about 500 km southwards from the Jan Mayen fracture zone. It is up to 160 km wide. The Jan Mayen Ridge separates the Norwegian Sea (the Norway Basin) from the Greenland Sea.〔C.Michael Hogan. 2011. Norwegian Sea. Eds. P.Saundry & C.J.Cleveland. Encyclopedia of Earth. National Council for Science and the Environment (U.S.) Washington DC〕 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「Jan Mayen Microcontinent」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.