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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 Nuvvuagittuq Greenstone Belt ： ウィキペディア英語版 Nuvvuagittuq Greenstone Belt The Nuvvuagittuq Greenstone Belt (NOO-voo-AG-it-tuck) (NGB) is a sequence of metamorphosed mafic to ultramafic volcanic and associated sedimentary rocks (a greenstone belt) located on the eastern shore of Hudson Bay, 40 km southeast of Inukjuak, Quebec. These rocks have undergone extensive metamorphism, and represent some of the oldest rocks on earth. Using uranium-lead dating on zircons, these rocks have been dated to be no younger than 3.7 billion years.〔Cates, N. L. & Mojzsis, S. J. Pre-3750 Ma supracrustal rocks from the Nuvvuagittuq supracrustal belt, northern Québec. Earth Planet. Sci. Lett. 255, 9–21 (2007).〕 More recently, measurements were made using samarium-neodymium dating that suggest a formation age of 4.3 billion years ago. These measurements, however, remain controversial. == History and geography == Formerly called the Porpoise Cove Greenstone Belt, the Nuvvuagittuq Greenstone Belt was first mapped in 1965 by the Quebec Ministry of Natural Resources. The area remained more or less unexamined until the 2000s when preliminary reports of U-Pb zircon dating in the area of the belt found zircons with ages up to 3750 Ma.〔 Since then, the Nuvvuagittuq Greenstone Belt has become the focus of intense study. There is still considerable disagreement between scientists regarding the history and age of this structure.〔〔O’Neil, J., Carlson, R. W., Paquette, J.-L. & Francis, D. Formation age and metamorphic history of the Nuvvuagittuq Greenstone Belt. Precambrian Res. 220-221, 23–44 (2012).〕〔Cates, N. L., Ziegler, K., Schmitt, A. K. & Mojzsis, S. J. Reduced, reused and recycled: Detrital zircons define a maximum age for the Eoarchean (ca. 3750–3780Ma) Nuvvuagittuq Supracrustal Belt, Québec (Canada). Earth Planet. Sci. Lett. 362, 283–293 (2013).〕 The Nuvvuagittuq Greenstone Belt is part of a mafic unit called the Ujaraaluk unit, both of which are in the Inukjuak subprovince of the Minto Block.〔 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「Nuvvuagittuq Greenstone Belt」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.