Geotermobarometria de granulitos do Cinturão Ribeira na porção norte do estado do Rio de Janeiro: seção Italva (RJ) – Patrocínio do Muriaé (MG)

Karniol, Tiago da Rocha; Machado, Rômulo; Moutte, Jacques

doi:10.25249/0375-7536.2009393519532

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…Litotipo/localização P (Kbar) T (°C) Santos et al (2005) Gnaisses da região de São Fidélis, no centro norte fluminense 8-9 750-800 Marques (2009) Metapelitos do Domínio Cambuci no norte fluminense 6,62 718 Marques (2009) Metabasitos do Domínio Cambuci em Bom Jesus do Itabapoana (RJ) 6,9 ± 1,9 720 Karniol et al (2009) Granulitos entre Patrocínio do Muriaé e Itaperuna 7,9 e 8,6 754-775 Karniol et al (2009) Granulitos entre Itaperuna e Italva 8,0 e 9,1 702-722 Marques et al (2017) Metabasitos do Domínio Cambuci em Bom Jesus do Itabapoana 10,5 850…”

Section: Autorunclassified

Petrografia e termobarometria de granitoides diatexíticos portadores de anfibólio da Região de São José de Ubá e São João do Paraíso (RJ)

Ferreira¹,

Marques²,

Melo³

et al. 2020

Geol. USP. Sér. Cient.

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Na região norte do Rio de Janeiro afloram rochas orto e paraderivadas neoproterozoicas de alto grau metamórfico, englobadas no Terreno Oriental da Faixa Ribeira. Dado a carência de estudos de detalhe na região, o presente trabalho contribui com novos aspectos de campo, petrografia, química mineral e geotermobarometria dos granitoides diatexíticos aflorantes na região entre São José de Ubá e São João do Paraíso, no noroeste fluminense. O litotipo é caracterizado por biotita-hornblenda gnaisses migmatíticos e protomiloníticos que são correlacionáveis a ortognaisses e granulitos do Complexo Serra da Bolívia (Domínio Cambuci da Faixa Ribeira). Dois litotipos neoformados são observados: um mesocrático, de caráter residual; e outro leucocrático, que correspondente ao leucossoma. O enriquecimento de K-feldspato no leucossoma em relação ao neossoma residual sugere baixos volumes de fusão por meio de reações de fusão envolvendo água. Aplicando-se diferentes geotermobarômetros, foram obtidas como condições de equilíbrio para o pico metamórfico 6,8 Kbar e 672–680°C (fácies anfibolito superior). Tais valores destoam dos encontrados na literatura para ouras rochas da região, reforçando a ideia de que os domínios do Terreno Oriental da Faixa Ribeira apresentam evoluções metamórficas distintas, em diferentes níveis crustais.

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Section: Autorunclassified

Petrografia e termobarometria de granitoides diatexíticos portadores de anfibólio da Região de São José de Ubá e São João do Paraíso (RJ)

Ferreira¹,

Marques²,

Melo³

et al. 2020

Geol. USP. Sér. Cient.

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“…In a regional context, some authors obtained geothermobarometer data for the Araçuaí-Ribeira Orogen System, which can be related with Oriental Terrane and Central Superterrane of Ribeira Belt and support the data in the present study. Karniol et al (2009) analyzed granulites located west of Itaperuna (RJ) with temperature ranging between 754 and 775 °C and pressure ranging between 7.9 and 8.6 kbar and granulites located east of Itaperuna with temperature values from 702 to 722 °C and pressure values from 8.0 to 9.1 kbar. Relatively lower temperatures and pressures, between 50 to 100 ºC and between 2.0 to 3.0 kbar, were obtained for the aluminous gneisses that emerge between Itaperuna and Italva.…”

Section: Discussionmentioning

confidence: 99%

Contrasting P-T conditions of Oriental Terrane and Central Superterrane (Ribeira Belt), NW of Rio de Janeiro state, Brazil

et al. 2021

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Neoproterozoic-Cambrian rocks from the Oriental Terrane and the Central Superterrane of the Ribeira Belt occur in northwest of Rio de Janeiro state. This paper presents new data on field research, petrology, mineral chemistry and conventional geothermobarometry, fundamental to understanding the geology of the region. The metabasic rocks from the Cambuci Domain are associated with the Central Superterrane retroarc basin and record two metamorphic events: M 0 (before the formation of the main foliation, under conditions of 788 °C) and M 1 (contemporary to the main foliation, with peak at 718-752 ºC and 6.62 kbar). The rocks from the Costeiro Domain, interpreted as the Rio Doce arc (Angelim Suite) and the retroarc basin (São Fidélis Goup) of the Oriental Terrane record a metamorphic peak at granulite facies yielding the highest pressure and temperature among the studied domains (752-784 °C and 8.2-9 kbar). The Italva Domain amphibolites represents the retroarc basin of the Oriental Terrane. Temperature and pressure values obtained for the Italva Domain metamorphic peak record 731 ºC and 6.78 kbar, respectively, in the transition zone between upper amphibolite and granulite facies conditions. This work presents the newest record of metamorphic evolution for the Oriental Terrane of the Ribeira Belt, suggesting an anticlockwise P-T-t path and near-isobaric cooling (IBC) for the rocks of the Cambuci Domain. Therefore, these results contribute to the understanding of the evolution of orogenic belts during the amalgamation of the Gondwana in the Neoproterozoic.

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“…As evidenced by the morphology of the zircon grains and high Th/U ratios, the high metamorphic grade of the rocks is also evidenced by mineral peak metamorphic associations typical of the granulite facies (with orthopyroxene + clinopyroxene + plagioclase) in all study samples. The Neoproterozoic granulite metamorphism is common in the entire JFC (Duarte et al 1997, Heilbron et al 1998, Medeiros Júnior et al 2017) and is also observed in nearby units, such as the paragneisses from the Raposos and Bom Jesus do Itabapoana groups and in the orthogneisses from the Neoproterozoic Serra da Bolivia/Rio Doce magmatic arc (Karniol et al 2009, Santos et al 2011, Gouvêa et al 2020, Marques et al 2021). In addition, the observation of hornblende and biotite partially substituting orthopyroxene and clinopyroxene in some samples suggests retrometamorphism in conditions of upper amphibolite facies, also in agreement with regional works (Santos et al 2011, Ferreira et al 2020, Marques et al 2021.…”

Section: Neoproterozoic Metamorphic Overprintmentioning

confidence: 97%

Rhyacian magmatic arc rocks with sanukitoid geochemical signature from the Juiz de Fora Complex, Minas-Bahia Orogenic System (SE-Brazil)

Ferreira

Heilbron²,

Bruno³

et al. 2022

Braz. J. Geol.

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Sanukitoid rocks make up a complete magmatic series with distinct geochemical characteristics of TTG suites and granitoids from modern magmatic arcs and are regarded as markers of the transition from typically Archean geodynamics to modern plate tectonics. Although most known sanukitoid suites formed during the Neoarchean and Mesoarchean, numerous papers have characterized Paleoproterozoic magmatic arc granitoid rocks showing affinity with the sanukitoid series. This work presents new data from field, lithogeochemistry, zircon U-Pb geochronology, and Sm-Nd and Sr isotopic studies on granodioritic granulites with sanukitoid signatures from the Juiz de Fora Complex ( JFC), one of the Paleoproterozoic tectonic components of the Minas-Bahia Orogenic System (MBOS), southern São Francisco Paleocontinent (southeastern Brazil). These rocks crystallized at ~2175 Ma and present values of εNd t between −4.0 and +0.5, T DM between 2.57 and 2.12 Ga, and 87 Sr/ 86 Sr i between 0.6937 and 0.7137. We interpret these rocks as the result of crystallization of magmas from a hybrid mantle source extensively contaminated by crustal material during protracted subduction. In southeastern São Francisco Paleocontinent, the association of sanukitoid rocks with other magmatic arc rocks points to a complex and prolonged Rhyacian accretionary system similar to modern plate tectonics.

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Geotermobarometria de granulitos do Cinturão Ribeira na porção norte do estado do Rio de Janeiro: seção Italva (RJ) – Patrocínio do Muriaé (MG)

Cited by 4 publications

References 34 publications

Petrografia e termobarometria de granitoides diatexíticos portadores de anfibólio da Região de São José de Ubá e São João do Paraíso (RJ)

Petrografia e termobarometria de granitoides diatexíticos portadores de anfibólio da Região de São José de Ubá e São João do Paraíso (RJ)

Contrasting P-T conditions of Oriental Terrane and Central Superterrane (Ribeira Belt), NW of Rio de Janeiro state, Brazil

Rhyacian magmatic arc rocks with sanukitoid geochemical signature from the Juiz de Fora Complex, Minas-Bahia Orogenic System (SE-Brazil)

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