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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 Spavinaw terrane ： ウィキペディア英語版 Spavinaw terrane The Spavinaw terrane is an occurrence of Proterozoic (1.40–1.35 Ga)〔Age of 1370 ±20 Ma for samples from Spavinaw Creek outcrop in: Bickford, M. E. and Richard D. Lewis, U-Pb geochronology of exposed basement rocks in Oklahoma, Geological Society of America Bulletin, 1979;90;540-544〕 intrusive and volcanic rocks in the mid-continent region of the United States. The terrane extends across southern Missouri, southern Kansas, northern Arkansas and much of Oklahoma. The rocks are almost entirely known from drill core and only exposed in outcrop near Spavinaw, Mayes County, Oklahoma and parts of the Saint Francois Mountains in Washington County, Missouri. The terrane is composed almost exclusively of essentially unaltered intrusive granites and volcanic rhyolite and rhyolite tuffs.〔Sims, P.K., Kisvarsanyi, E.B., and Morey, G.B., 1987, ''Geology and metallogeny of Archean and Proterozoic basement terranes in the northern Midcontinent, U.S.A.'' U.S. Geological Survey Bulletin, 1815〕 The terrane is 100 m.y. younger than the Saint Francois terrane of southeast Missouri, but older than tholeiitic basalts and rhyolites of Middle Proterozoic Midcontinent Rift System.〔 ==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「Spavinaw terrane」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.