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- W1837352392 abstract "Em regiões afetadas por tectônica convergente é comum a presença de um ou mais elementos alóctones que supostamente foram acrescidos à margem continental. Se esses elementos forem limitados por falhas ou zonas de cisalhamento importantes, são chamados de terrenos. Os terrenos apresentam tamanhos variáveis e, por vezes, representam fragmentos crustais alóctones, que podem apresentar histórias evolutivas individuais anteriores à sua acreção. Terrenos podem ser classificados em função de suas características individuais (estratigráficos, fragmentados ou metamórficos) e pelo tipo de acreção a que foram submetidos (frontal, lateral ou oblíqua). A análise de terrenos representa técnica multidisciplinar utilizada no estudo de cinturões orogênicos que tem como objetivo principal o entendimento dos diversos processos geodinâmicos relacionados a ambientes de subducção e complexos colisionais, sendo amplamente aplicada em diversas regiões do planeta. Em alguns orógenos pré-cambrianos brasileiros tem-se reconhecido padrões que permitem interpretar sua evolução como resultado de processos acrecionários e de colagem de terrenos, descritos em vários segmentos das províncias Tocantins e Borborema.Palavras-Chave: Cinturões orogênicos, tectônica acrescionária, terrenos alóctones. Abstract: TECTONIC ANALYSIS OF TERRANES: METHODOLOGY, APPLICATION IN OROGENIC BELTS AND EXAMPLES FROM TOCANTINS AND BORBOREMA PROVINCES, BRAZIL. In regions affected by convergent tectonics, the presence of some allochtonous elements that were accreted to the continental margin is common. If these elements are bounded by important faults or shear zones, they are called terranes. Terranes present variable sizes and may represent allochtonous crustal fragments, with individual evolutive history previous to their accretion to the continental margin. Terranes can be classified as a function of its individual characteristics (stratigraphic, disrupted or metamorphic) and formed by frontal, lateral or oblique accretion. Terrane analysis represents a multidisciplinary technique used in studying orogenic belts that aims the understanding of several processes related to subduction and collisional complexes. Certain patterns recognized in some Brazilian Precambrian orogens allow to interpret their evolution as the result of accretion tectonic events recorded in the Tocantins and Borborema provinces.Key-words: Orogenic belts, Accretion Tectonics, Allochtonous Terranes." @default.
- W1837352392 created "2016-06-24" @default.
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- W1837352392 date "2014-12-31" @default.
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- W1837352392 title "ANÁLISE TECTÔNICA DE TERRENOS: METODOLOGIA, APLICAÇÃO EM CINTURÕES OROGÊNICOS E EXEMPLO DAS PROVÍNCIAS TOCANTINS E BORBOREMA, BRASIL." @default.
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- W1837352392 doi "https://doi.org/10.18285/geonomos.v22i2.317" @default.
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