翻訳と辞書 Words near each other ・ Noncontracting grammar ・ Nonconvex great rhombicosidodecahedron ・ Nonconvex great rhombicuboctahedron ・ Noncototient ・ Noncourt-sur-le-Rongeant ・ Noncovalent solid-phase organic synthesis ・ Noncrossing partition ・ Noncustodial parent ・ Non-violation nullification of benefits ・ Non-Violence (sculpture) ・ Non-violent abortion protests ・ Non-virtual interface pattern ・ Non-Volatile File System ・ Non-volatile memory ・ Non-volatile random-access memory ・ Non-volcanic passive margins ・ Non-voluntary euthanasia ・ Non-Voters Party ・ Non-voting members of the United States House of Representatives ・ Non-voting stock ・ Non-wage labour costs ・ Non-well-founded set theory ・ Non-wellfounded mereology ・ Non-X histiocytosis ・ Non-zero ・ Non-zero dispersion-shifted fiber ・ Non-Zionism ・ Nona ・ Nona (deity) ・ Nona (short story) Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Non-volcanic passive margins ： ウィキペディア英語版 Non-volcanic passive margins Non-volcanic passive margins (NVPM) constitute one end member of the transitional crustal types that lie beneath passive continental margins; the other end member being volcanic passive margins (VPM). Transitional crust welds continental crust to oceanic crust along the lines of continental break-up. Both VPM and NVPM form during rifting, when a continent rifts to form a new ocean basin. NVPM are different from VPM because of a lack of volcanism. Instead of intrusive magmatic structures, the transitional crust is composed of stretched continental crust and exhumed upper mantle. NVPM are typically submerged and buried beneath thick sediments, so they must be studied using geophysical techniques or drilling. NVPM have diagnostic seismic, gravity, and magnetic characteristics that can be used to distinguish them from VPM and for demarcating the transition between continental and oceanic crust. == Typical characteristics == NVPM are the result of rifting when a continent breaks up to form an ocean, producing transitional crust without volcanism. Extension causes a number of events to occur. First is lithospheric thinning, which allows asthenospherc upwelling; heating further erodes the lithosphere, furthering the thinning process. The extensional forces also cause listric faults and continentward dipping reflectors that help identify NVPM and distinguish them from VPM, characterized by seaward-dipping seismic reflectors. The main difference between NVPM and VPM is that in the latter case, the mantle is hot enough to melt and produce voluminous basalts, whereas in the former case the mantle doesn't melt and there is little or no volcanism. Instead, extension simply pulls the crust away, exposing or "unroofing" the mantle, exposing serpentinized peridotite. The mantle doesn't melt because it is cold or upwells slowly, so there are no igneous rocks like there are in VPM. The basalts and granites are replaced with serpentinized peridotite, accompanied by unique serpentothemal and hydrothermal activity. Increasing density of the lithosphere as it cools and sediment accumulation causes subsidence. 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「Non-volcanic passive margins」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.