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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 Crowsnest Formation ： ウィキペディア英語版 Crowsnest Formation The Crowsnest Formation, also called the Crowsnest Volcanics, is a geological formation in southwestern Alberta, Canada, on the southwestern margin of the Western Canada Sedimentary Basin. It was named for the Crowsnest Pass near Coleman, Alberta. The formation consists mostly of pyroclastic rocks that were laid down in a series of explosive eruptions about 100 million years ago during the Albian stage of the Early Cretaceous epoch. It contains unusual minerals such as melanite (a variety of andradite garnet) and analcime (a variety of zeolite).〔 ==Lithology and mineralogy== The formation contains pyroclastic flows, lahars, agglomerates, tuffs and ash-fall deposits, as well as volcanic-rich sandstones and other sediments.〔Leckie, D. and Burden, E.T. 2001. Stratigraphy, sedimentology, and palynology of the Cretaceous (Albian) Beaver Mines, Mill Creek, and Crowsnest Formations (Blairmore Group) of southwestern Alberta. Geological Survey of Canada, Bulletin 563, 103 p.〕 The whole-rock chemistry of the volcanics is relatively normal, ranging from trachyandesite (latite) to phonolite and trachyte,〔 but the mineralogy is unusual.〔 In addition to analcime and melanite, common minerals include sanidine, aegerine-augite and chlorite. Blairmorite, a rare analcime-rich rock-type named for the town of Blairmore, Alberta, is known only from the Crowsnest Formation and a locality in Mozambique.〔 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「Crowsnest Formation」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.