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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 Morton Gneiss ： ウィキペディア英語版 Morton Gneiss The Morton Gneiss is an Archean-age migmatitic gneiss found in the Minnesota River Valley of southwestern Minnesota. Zircon crystals from the gneiss have been dated to 3524 ± 9 Ma. Zircons from the Montevideo Gneiss from Chippewa County have an age of 3485 ± 10 Ma.〔(M.E. Bickford, J.L. Wooden and R.L. Bauer, 2006 ''SHRIMP study of zircons from Early Archean rocks in the Minnesota River Valley: Implications for the tectonic history of the Superior Province,'' GSA Bulletin, v. 118 no. 1-2 p. 94-108 )〕 Its type locality is in Morton, Minnesota where it is also known as "Rainbow Gneiss", and is quarried as a facing stone for buildings.〔(Minnesota Geological Survey )〕 The Morton Gneiss is the oldest rock unit in the United States.〔(Emporia State University )〕 ==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「Morton Gneiss」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.