Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny

FRANÇA, Ohana; RUIZ, Amarildo Salina; SOUSA, Maria Zélia Aguiar de; BATATA, Maria Elisa Fróes; LAFON, Jean Michel

Artigo

Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny

Morrinhos granite is a batholith body that is slightly elongated in the NNW direction and approximately 1,140 km2 long; it is located in the municipality of Vila Bela da Santíssima Trindade of the state of Mato Grosso, Brazil, in the Paraguá Terrane, Rondonian-San Ignácio Province, in the SW portion...

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Autor principal:	FRANÇA, Ohana
Outros Autores:	RUIZ, Amarildo Salina, SOUSA, Maria Zélia Aguiar de, BATATA, Maria Elisa Fróes, LAFON, Jean Michel
Grau:	Artigo
Idioma:	eng
Publicado em:	2015
Assuntos:	Geologia Geocronologia Granito Morrinhos Suíte Intrusiva Pensamiento Vila Bela da Santíssima Trindade - MT Mato Grosso - Estado Amazônia brasileira
Acesso em linha:	http://repositorio.ufpa.br/jspui/handle/2011/6395

id	ir-2011-6395
recordtype	dspace
spelling	ir-2011-63952019-05-22T12:32:04Z Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny Geologia, petrologia, geocronologia U-Pb (shrimp) do Granito Morrinhos -terreno Paraguá, SW do Cráton Amazônico: implicações sobre a evolução magmática da orogenia san ignácio FRANÇA, Ohana RUIZ, Amarildo Salina SOUSA, Maria Zélia Aguiar de BATATA, Maria Elisa Fróes LAFON, Jean Michel Geologia Geocronologia Granito Morrinhos Suíte Intrusiva Pensamiento Vila Bela da Santíssima Trindade - MT Mato Grosso - Estado Amazônia brasileira Morrinhos granite is a batholith body that is slightly elongated in the NNW direction and approximately 1,140 km2 long; it is located in the municipality of Vila Bela da Santíssima Trindade of the state of Mato Grosso, Brazil, in the Paraguá Terrane, Rondonian-San Ignácio Province, in the SW portion of the Amazonian Craton. This intrusion displays a compositional variation from tonalite to monzogranite, has a medium to coarse inequigranular texture and is locally porphyritic; biotite is the predominant mafic in one of the facies, and hornblende is predominant in the other, with both metamorphosed into the greenschist facies. The studied rocks characterize an intermediate to acidic sequence that was formed by a subalkaline magmatism; the series is alkali-calcic to metaluminous to slightly peraluminous, and the rocks evolved through fractioned crystallization mechanisms. The structural data show two deformation phases represented by penetrative foliation (S1) and open folds (D2), and both phases were most likely related to the San Ignácio Orogeny. The geochronological (U-Pb SHRIMP) and isotopic (Sm-Nd) investigations of these rocks indicated a crystallization age of 1350 ± 12 Ma, TDM of approximately 1.77 Ga and εNd(1.35) with a negative value of -2.57, suggesting that their generation was related to a partial melting process of a Paleoproterozoic (Statherian) continental crust. The results herein indicate that the Morrinhos granite was generated in a continental magmatic arc in a late- to post-orogenic stage of the San Ignácio Orogeny, and it can be recognized as belonging to the Pensamiento Intrusive Suite. O Granito Morrinhos é um corpo batolítico levemente alongado segundo a direção NNW, de aproximadamente 1.140 km2, localizado no município de Vila Bela da Santíssima Trindade, estado de Mato Grosso. Situa-se no Terreno Paraguá, Província Rondoniana-San Ignácio, na porção SW do Cráton Amazônico. Essa intrusão exibe uma variação composicional entre tonalito a monzogranito, textura inequigranular média a grossa, localmente, porfirítica, tendo biotita como máfico predominante em uma das fácies e hornblenda na outra, ambas metamorfizadas na fácies xisto verde. As rochas estudadas caracterizam uma sequência intermediária a ácida formada por um magmatismo subalcali no, do tipo álcali-cálcico, metaluminoso a levemente peraluminoso evoluído por meio de mecanismos de cristalização fracionada. Dados estruturais exibem registros de duas fases deformacionais, representadas pela foliação penetrativa (S1) e dobras abertas (D2) ambas, provavelmente, relacionadas à Orogenia San Ignácio. A investigação geocronológica (U-Pb SHRIMP) e geoquímica isotópica (Sm-Nd) dessas rochas indicaram, respectivamente, idade de cristalização 1.350 ± 12 Ma, TDM em torno de 1,77 Ga e valor negativo para εNd(1,35) de -2,57, sugerindo uma geração relacionada com processo de fusão parcial de uma crosta continental paleoproterozoica (estateriana). Os resultados aqui obtidos indicam que o Granito Morrinhos foi gerado em arco magmático continental, em estágio tardi a pós-orogênico, da Orogenia San Ignácio e permite reconhecê-lo como pertencente à Suíte Intrusiva Pensamiento. 2015-03-06T15:18:33Z 2015-03-06T15:18:33Z 2014-09 Artigo de Periódico FRANCA, Ohana et al. Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny. Brazilian Journal of Geology, São Paulo, v. 44, n. 3, p. 415-432, jul./set. 2014. Disponível em: <http://www.scielo.br/pdf/bjgeo/v44n3/2317-4889-bjgeo-44-03-00415.pdf>. Acesso em: 05 mar. 2015. <http://dx.doi.org/10.5327/Z2317-4889201400030006>. 2317-4889 http://repositorio.ufpa.br/jspui/handle/2011/6395 eng Acesso Aberto application/pdf
institution	Repositório Institucional - Universidade Federal do Pará
collection	RI-UFPA
language	eng
topic	Geologia Geocronologia Granito Morrinhos Suíte Intrusiva Pensamiento Vila Bela da Santíssima Trindade - MT Mato Grosso - Estado Amazônia brasileira
spellingShingle	Geologia Geocronologia Granito Morrinhos Suíte Intrusiva Pensamiento Vila Bela da Santíssima Trindade - MT Mato Grosso - Estado Amazônia brasileira FRANÇA, Ohana Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny
topic_facet	Geologia Geocronologia Granito Morrinhos Suíte Intrusiva Pensamiento Vila Bela da Santíssima Trindade - MT Mato Grosso - Estado Amazônia brasileira
description	Morrinhos granite is a batholith body that is slightly elongated in the NNW direction and approximately 1,140 km2 long; it is located in the municipality of Vila Bela da Santíssima Trindade of the state of Mato Grosso, Brazil, in the Paraguá Terrane, Rondonian-San Ignácio Province, in the SW portion of the Amazonian Craton. This intrusion displays a compositional variation from tonalite to monzogranite, has a medium to coarse inequigranular texture and is locally porphyritic; biotite is the predominant mafic in one of the facies, and hornblende is predominant in the other, with both metamorphosed into the greenschist facies. The studied rocks characterize an intermediate to acidic sequence that was formed by a subalkaline magmatism; the series is alkali-calcic to metaluminous to slightly peraluminous, and the rocks evolved through fractioned crystallization mechanisms. The structural data show two deformation phases represented by penetrative foliation (S1) and open folds (D2), and both phases were most likely related to the San Ignácio Orogeny. The geochronological (U-Pb SHRIMP) and isotopic (Sm-Nd) investigations of these rocks indicated a crystallization age of 1350 ± 12 Ma, TDM of approximately 1.77 Ga and εNd(1.35) with a negative value of -2.57, suggesting that their generation was related to a partial melting process of a Paleoproterozoic (Statherian) continental crust. The results herein indicate that the Morrinhos granite was generated in a continental magmatic arc in a late- to post-orogenic stage of the San Ignácio Orogeny, and it can be recognized as belonging to the Pensamiento Intrusive Suite.
format	Artigo
author	FRANÇA, Ohana
author2	RUIZ, Amarildo Salina SOUSA, Maria Zélia Aguiar de BATATA, Maria Elisa Fróes LAFON, Jean Michel
author2Str	RUIZ, Amarildo Salina SOUSA, Maria Zélia Aguiar de BATATA, Maria Elisa Fróes LAFON, Jean Michel
title	Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny
title_short	Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny
title_full	Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny
title_fullStr	Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny
title_full_unstemmed	Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny
title_sort	geology, petrology, u-pb (shrimp) geochronology of the morrinhos granite -paraguá terrane, sw amazonian craton: implications for the magmatic evolution of the san ignácio orogeny
publishDate	2015
url	http://repositorio.ufpa.br/jspui/handle/2011/6395
_version_	1832602818828042240
score	11.755432

Geology, petrology, U-Pb (shrimp) geochronology of the Morrinhos granite -Paraguá terrane, SW Amazonian craton: implications for the magmatic evolution of the San Ignácio orogeny

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