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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 Geology of Uruguay ： ウィキペディア英語版 Geology of Uruguay The geology of Uruguay combines areas of Precambrian-aged shield units with a region of volcanic rock erupted during the Cretaceous and copious sedimentary facies the oldest of which date from the Devonian. Big events that have shaped the geology of Uruguay include the Transamazonian orogeny (2000 million years ago (mya)), the breakup of Rodinia (700–500 mya) and the opening of the South Atlantic (~145 mya). ==Shield region== The Precambrian shield in Uruguay includes part of Río de la Plata craton, an extensive area of stable crystaline basement rock underlying Uruguay and large areas of eastern Argentina and southern Brazil. The shield in Uruguay goes under the name of Rio Grande do Sul—Uruguay Shield and includes parts of Southern Brazil.〔Butler, Louis W. 1970. (Shallow structure of the Continental Margin, Southern Brazil and Uruguay ). GSA Bulletin.〕 Though the Río de la Plata Craton underlies practically all of Uruguay, it only shows up in the south and east of the country since in other parts of the country, it is covered by younger volcanic rocks or sediments. The shield was formed during two orogenic events; one 2000 million years ago (mya) for the western part and another 700–500 mya for the eastern part.〔Jorge Bossil and Claudio Gaucher. 2003. (The Cuchilla Dionisio Terrane, Uruguay: An Allochthonous Block Accreted in the Cambrian to SW-Gondwana ). Gondwana Research, V7, No. 3, pp. 661-674〕 The later orogenic event is the result of the accretion of blocks and terranes in the aftermath of the breakup of Rodinia when São Francisco and Río de la Plata cratons formed one plate in the west of the Adamastor Ocean.〔Benjamim Bley de Brito Neves, Mário da Costa Campos Neto and Reinhardt Adolfo Fuck. 1999. (From Rodinia to Western Gondwana: An approach to the Brasiliano-Pan African Cycle and orogenic collage )〕 The eastern part of the Uruguayan shield region is crossed by two major shear zones both running roughly in north-south direction the dextral Sarandí del Yí-Piriápolis Shear Zone and the sinistral Sierra Ballena Shear Zone.〔 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「Geology of Uruguay」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.