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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 Dunham classification ： ウィキペディア英語版 Dunham classification The Dunham classification system for carbonate sedimentary rocks was devised by Robert J. Dunham in 1962, and refined by Embry and Klovan in 1971〔Embry, A.F. III and Klovan, J.S. 1971. A Late Devonian reef tract on northeastern Banks Island, N.W.T. Bulletin of Canadian Petroleum Geology vol. 4, p. 730-781.〕 to include sediments that were organically bound during deposition. ==History== Robert J. Dunham published his classification system for limestone in 1962. His scheme focuses on the depositional fabric of carbonate rocks. Dunham divides the rocks into four main groups based on relative proportions of coarser clastic particles. Dunham names are essentially for rock families. His efforts deal with the question of whether or not the grains were originally in mutual contact; and therefore self-supporting, or whether the rock is characterized by the presence of frame builders and algal mats. Unlike the Folk classification scheme, Dunham deals with the original porosity of the rock. The Dunham scheme is more useful for hand samples because it is based on texture and not the grains in the sample 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「Dunham classification」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.