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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 Lava delta ： ウィキペディア英語版 Lava delta Lava deltas, similar to river deltas form wherever sufficient sub-aerial flows of lava enter standing bodies of water. The lava cools and breaks up as it encounters the water, with the resulting fragments filling in the adjacent seabed topography such that the flow can move further offshore sub-aerially. Lava deltas are generally associated with large-scale, effusive type basaltic volcanism. ==Occurrence== Lava deltas are found mainly associated with volcanic islands, particularly those formed at hotspots as they produce the necessary effusive basaltic flows. The largest lava delta systems known are associated with formation of volcanic type passive margins. Just prior to break-up along the northern Atlantic in the late Paleocene, massive eruptions occurred along the eventual line of break-up. This volcanism, part of the North Atlantic Igneous Province, led to the formation of two extensive lava escarpments, interpreted as deltas,〔Kiørbøe, L. 1999. Stratigraphic relationships of the Lower Tertiary of the Faeroe Basalt Plateau and the Faeroe-Shetland Basin. In: Fleet, A.J. & Boldy, S.A.R. (eds)Petroleum Geology of Northwest Europe: Proceedings of the 5th Conference, Geological Society, London.〕 extending from the Faeroes onto the Møre Margin (the Faeroe-Shetland escarpment) and the Vøring escarpment on the Vøring margin, a combined distance of approximately 1000 km.〔(Bendt, C., Planke, S., Alvestad, E., Tsikalas, F. & Rasmussen, T. 2001. Seismic volcanostratigraphy of the Norwegian Margin: constraints on tectonomagmatic break-up process. Journal Geological Society London, 158, 413-426. )〕 As these deltas were prograding into water of relatively constant depth, they were able to extend as much as 25 km from their original vents.〔(White, R.S., Spitzer, R., Christie, P.A.F. & iSIMM team. 2004. Seismic imaging through basalt flows on the Faroe Shelf. Presentation at Petex. )〕 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「Lava delta」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.