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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 Deformation bands ： ウィキペディア英語版 Deformation bands Deformation bands are small faults with very small displacements. In the past, these bands have been called Luder's bands or braided shear fractures.〔Schultz, R. 2009. Fractures and Deformation Bands in Rock: A Field Guide and Journey into Geologic Fracture Mechanics. Oxford University Press〕〔http://www.springerlink.com/content/r70236158556gww32/ 〕 They often precede large faults. They develop in porous rocks, such as sandstone. Material in a deformation band has a much smaller grain size, poorer sorting, and a lower porosity than the original sandstone. They can restrict and/or change the flow of fluids like water and oil. They are common in the Colorado Plateau,〔http://folk.uib.no/nglhe/Utah.html〕 where examples occur in the Entrada Sandstone in the San Rafael Swell in Utah.〔 Deformation bands are present in a variety of porous rock types such as sandstones, limestones, siltstones, poorly welded volcanic tuffs, and breccias. The cataclastic and compactional bands often form seals and prevent the flow of groundwater or oil. In their formation grains shift their packing and are crushed.〔Schultz, R. and R. Siddharthan. 2005. A general framework for the occurrence and faulting of deformation bands in porous granular rocks. Tectonophysics: 411. 1-18.〕 The Mars Reconnaissance Orbiter showed deformation bands in Capen Crater, located in the Arabia quadrangle.〔http://mars.jpl.nasa.gov/mro/gallery/press/20080918c.html〕 The bands represent failure by localized frictional sliding. ==References== 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「Deformation bands」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.