Academic literature on the topic 'Faixa Ribeira'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Faixa Ribeira.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Faixa Ribeira"
HEILBRON, MONICA, CLÁUDIO DE MORISSON VALERIANO, CLÁUDIA SAYÃO VALLADARES, and NUNO MACHADO. "A OROGÊNESE BRASILIANA NO SEGMENTO CENTRAL DA FAIXA RIBEIRA, BRASIL." Revista Brasileira de Geociências 25, no. 4 (December 1, 1995): 249–66. http://dx.doi.org/10.25249/0375-7536.1996249266.
Full textHeilbron, M., R. Machado, and M. C. H. Figueiredo. "Litogeoquímica dos granulitos paleoproterozóicos do segmento central da faixa Ribeira, Brasil." Boletim IG-USP. Publicação Especial, no. 18 (October 1, 1996): 95. http://dx.doi.org/10.11606/issn.2317-8078.v0i18p95-96.
Full textFerreira, Sandro Lúcio Mauri, Rodson de Abreu Marques, Marilane Gonzaga de Melo, Edgar Batista de Medeiros Junior, Sâmara Veiga dos Reis, Roger Mendes Silva, Heitor de Freitas Valle, and Gláucia Nascimento Queiroga. "Petrografia e termobarometria de granitoides diatexíticos portadores de anfibólio da Região de São José de Ubá e São João do Paraíso (RJ)." Geologia USP. Série Científica 20, no. 4 (December 9, 2020): 23–37. http://dx.doi.org/10.11606/issn.2316-9095.v20-167607.
Full textMendes, Julio Cezar, Patrícia Duffles Teixeira, Gabriel Corrêa de Matos, Isabel Pereira Ludka, Felipe Fonseca Fernandes de Medeiros, and Ciro Alexandre Ávila. "Geoquímica e geocronologia do granitóide Barra Alegre, faixa móvel Ribeira, Rio de Janeiro." Revista Brasileira de Geociências 37, no. 01 (March 1, 2007): 101–13. http://dx.doi.org/10.25249/0375-7536.2007371101113.
Full textDuarte, B. P., M. C. H. Figueiredo, M. C. Campos Neto, and M. Heilbron. "Geoquímica das rochas granulíticas do complexo Juiz de Fora, segmento central da faixa ribeira." Boletim IG-USP. Publicação Especial, no. 18 (October 1, 1996): 41. http://dx.doi.org/10.11606/issn.2317-8078.v0i18p41-42.
Full textMOTERANI, Ana Carolina Machado, Rubem PORTO JÚNIOR, Mauro Cesar GERALDES, and Maria Virgínia Alves MARTINS. "MAGMATISMO PÓS-TECTÔNICO INVESTIGADO POR MEIO DOS MÉTODOS GEOCRONOLÓGICOS U-Pb E Lu-Hf, COMPLEXO PEDRA BRANCA, RIO DE JANEIRO – RJ." Geosciences = Geociências 39, no. 04 (December 19, 2020): 903–23. http://dx.doi.org/10.5016/geociencias.v39i04.14283.
Full textCorrêa, Hermes Geraldo, Sergio Hugo Benez, Ronaldo S. Berton, and Luís Alberto Sáes. "Depósitos de calda obtidos com a aplicação aérea de defensivos na cultura da banana." Bragantia 63, no. 1 (2004): 121–28. http://dx.doi.org/10.1590/s0006-87052004000100012.
Full textSilva, Cláudio Maurício Teixeira da, Fernando Flecha Alkmim, and Antônio Carlos Pedrosa-Soares. "Geometria e evolução do feixe de zonas de cisalhamento Manhuaçu - Santa Margarida, Orógeno Araçuaí, MG." Rem: Revista Escola de Minas 62, no. 1 (March 2009): 23–34. http://dx.doi.org/10.1590/s0370-44672009000100005.
Full textCosta, Rodrigo Vinagre da, Rudolph Allard Johannes Trouw, and Julio Cezar Mendes. "Geologia e geocronologia do Charnockito São Francisco Xavier e do Gabronorito Ribeirão do Paiol (MG/SP) e suas possíveis relações com processos crustais extensionais nos orógenos Brasília Meridional e Ribeira Central." Geologia USP. Série Científica 18, no. 1 (March 1, 2018): 85. http://dx.doi.org/10.11606/issn.2316-9095.v18-401.
Full textOliveira, Marcos Aurélio Farias de, Vanderlei Maniesi, Wilson Teixeira, and Elias Carneiro Daitx. "Caracterização isotópica de metabasitos e anfibolitos dos Grupos Açungui e Setuva na Porção Sul da Faixa Ribeira." Geologia USP. Série Científica 2, no. 1 (December 1, 2002): 161–70. http://dx.doi.org/10.5327/s1519-874x2002000100013.
Full textDissertations / Theses on the topic "Faixa Ribeira"
Neto, Coriolano de Marins e. Dias. "Evolução Tectono-Termal do Complexo Costeiro (Faixa de Dobramentos Ribeira) em São Paulo." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/44/44134/tde-30092013-151641/.
Full textGeochonological, petrographic and litochemical data have been used to characterize the crustal evolution and the thermochronology of the Costeiro Complex in the state of São Paulo This part of the Ribeira Folded Belt is composed of paraderived rocks on the east and orthoderived rocks on the west, which are organized in a ductile shear zone forming a positive flower structure, whose axis runs ENE-WSW. Main amphibolite occurrences are found within predominant kinzigitic gneisses along this axis. The intrusive basic rocks which originated the amphibolites have a 580 Ma (U-Pb SHRIMP) age of crystallization. They formed tabular intrusions and a secondary magmatic chamber. The amphibolite occurrence at Boissucanga still preserves its continental tholeiitic characteristics. The U-Pb SHRIMP method on zircons, Sm-Nd and Rb-Sr of both whole rock and mineral concentrations and K-Ar of minerals yielded the age of magmatic crystallization and the age of the highest metamorphism which affected this complex. The above methods also permitted interpretation of the regional cooling history after the peak in metamorphism.The close proximity of the basic magmatism and the peak in the metamorphism is evident from the 570 Ma, U-Pb age determination of overgrowths on detritic zircon crystals of the paragneisses. This determination suggests tectonic environment of a back-arc sedimentary basin over continental crust. The source areas were probably rocks differentiated from the mantle between the Paleoproterozoic and Neoproterozoic. The convergent dynamics responsible for the Ribeira montains reached temperatures of 800 °C and pressures around 5,5 Kb in the Costeiro Complex. The P-T-t path of this process was established by geothermobarometric studies. At the maximum of compressive shortening of the orogen, the continental collision process evolved into directional shear movements with the presence of transpressive flower structures. Despite the predominant dextral kinematics of the Ribeira Belt, this study found several sinistral kinematic markers, observed mainly along the flanks of the flower structure, associated with rocks representative of the metamorphic peak and later stages. The distribuition of amphibolitic bodies along the axis of the flower structure, as well as the positioning of the Mesozoic magmatism, in this region, imparts special significance to this structure, as evidencing recurrent geologic events due to strong tectonic inheritance of an older master structure. According to thermochronologic studies, the temperatures of this crustal segment were high between 580 and 480 My, decreasing from 800 °C to 450 °C (a rate of around 3 °C/My). This rate is coherent with the cooling rate indicated by the Fe\'EQUIVALENTE A\'Mg diffusion between garnets and their biotite inclusions. After this period, the data indicate a strong increase in the cooling process of this complex, interpreted as an important regional uplift phase, concordant with a period of pegmatitic activity which strongly affected the study area. The penecontemporaneity and localization of the orogenic uplift and development of the Neoproterozoic-Eopaleozoic molassic basins followed by the sedimentary sequences of the Paraná Basin suggest that these geological processes are closely related.
Karniol, Tiago da Rocha. "Tectônica da conexão do Cinturão Ribeira com a Faixa Araçuaí - Divisa Rio de Janeiro/Espírito Santo." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/44/44141/tde-12022009-151332/.
Full textLitho-structural characterizations carried out on two transverse sections of the Neoproterozoic Ribeira Belt, in the north portion State of Rio de Janeiro and southern State of Espírito Santo, southeastern Brazil, show that it represents part of the transpressive dextral orogen related to the Central Mantiqueira Province. NNE-trending and steeply-dipping regional mylonitic belts describe a map-scale, S-C-like structure that is characterized by their deflection towards NE near the Além Paraíba shear zone. This geometry is consistent with oblique continental collision considering the São Francisco Craton as a reference. In the Italva (RJ) - Muriaé (MG) section, the shear zones on its eastern part present predominant top to SW, parallel-to-the-orogen, transpressive movements and top-down-to-ESE tectonics on the central-western part of the section related to intermediary-dipping shear zones with frontal lineation. The main shear zones on the Marechal Floriano - Ibatiba (ES) section describe oblique movements with dextral component and top-to-SW tectonic flow, as described in the Guaçuí shear zone. At some outcrops, sinistral structures may reflect antithetic movements on these zones. Lithological and structural control related to deformation partitioning lead to the formation of milonites and felsic mylonitic granulites in ductile shear zones, alternated with less deformed intermediate to basic granulites with charnockitic lenses. Indeed, the anastomosed geometry and fan-like pattern of planar structures, as well as the complex relation with linear elements, may be a result of the transpressive shear. The garnet granulites on the northern region of Rio de Janeiro present chemical equilibrium from 700 to 780 °C and from 7.9 to 9.3 kbar which is higher than the intervals of 600-670 °C and 5,8-6,7 kbar obtained for aluminous gneisses on the eastern portion of the section. These differences on geothermobarometric results, mostly higher considering the nuclei of minerals in relation to its borders, the kinematic characteristics and microstructural pattern of samples suggest a more elevated exhumation rate for the granulites in this orogenic segment. Considering a transpressive regime related to oblique tectonic plates or blocks collision, this process can be explained by the ductile extrusion of infracrustal portions as shown by extensional shear zones described in this work. Because of our investigations, we think that the limit of Ribeira and Araçuaí belts on parallel 21° South, as considered by some authors, is arbitrary. The contrasts on kinematics on both studied sections point to longitudinal variations of deformation path that may reflect boundary condition changes, like the geometry of the craton and rheologic transitions of rocks caused by differential partial melting, that lead to extrusion tectonics with partial preservation of granulitic parageneses on the investigated segment.
Marques, Rodson de Abreu. "Evolução metamórfica do terreno oriental da Faixa Ribeira entre Italva e Bom Jesus do Itabapoana, noroeste do RJ." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=946.
Full textA região entre Bom Jesus de Itabapoana e Italva tem seu contexto geológico situado no Terreno Oriental (Domínios Cambuci, Costeiro e Italva) do Setor Central da Faixa Ribeira. Esta Faixa foi formada durante a Orogenia Brasiliana (Neoproterozóico-Cambriano), na borda sul/sudeste do Cráton São Francisco. A partir de mapas publicados na área e coletas de amostra em dois perfis estruturais, desenvolveu-se o presente trabalho, cuja meta foi a análise química de mineral para a investigação do metamorfismo dos Domínios Cambuci, Costeiro (Unidades Angelim e São Fidélis) e Italva. Para tal, foi objeto de estudo os metapelitos e metabasitos dos domínios supracitados. A identificação de associações minerais, a discriminação de diferentes equilíbrios metamórficos e a determinação de valores absolutos de pressão e temperatura (geotermobarometria) para cada um dos Domínios Tectônicos do Terreno Oriental foram os parâmetros fundamentais para a caracterização da evolução metamórfica da área de estudo. Estes dados indicaram diferentes condições e evoluções metamórficas, com distintos níveis crustais, para os diferentes domínios do Terreno Oriental. As rochas do Domínio Cambuci registram dois eventos térmicos distintos, ambos sob condições de alta temperatura, sendo o primeiro formado sob condições de pressão mais baixas que o segundo. Os litotipos do Domínio Costeiro registram pico metamórfico sob condições de facies granulito de pressão intermediária e os valores de pressão e temperatura obtidos foram os mais altos dentre os três domínios estudados. As rochas do Domínio Italva fornecem valores de temperatura correspondentes às condições de facies anfibolito superior a granulito, sob pressão baixa a intermediária.
The region between Bom Jesus de Itabapoana and Italva consists of a high-grade metamorphic terrane situated within the so-called Oriental Terrane of the Central Sector of the Ribeira Belt. This belt, of neoproterozóic-cambrian age, was formed during the Brasiliano Orogeny, in the south / southeast margin of the São Francisco Craton. The present work was developed on the basis of preexisting geological maps and collection of samples along two structural sections of the study area. The aim of this work is the investigation of the metamorphism of the Cambuci, Costeiro and Italva Domains of the Oriental Terrane. This investigation was based on the acquisition and interpretation of chemical analyses of mineral phases from metapelites and metabasites of the previously quoted domains. The identification of mineral parageneses, the discrimination of different metamorphic equilibriums and the determination of absolute values of pressure and temperature (geothermobarometry) for each one of the study tectonic domains were the basic tools used for the characterization of the metamorphic evolution of the area. The obtained data indicated different conditions and metamorphic evolutions, including different crustal levels, for the different tectonic domains of the Oriental Terrane. The rocks of the Cambuci Domain register two different thermal events, both under high temperature and medium pressure conditions. The first event, not inequivocaly metamorphic, was developed under lower pressures than the second one. The rocks of the Costeiro Domain record metamorphic peak under conditions of medium pressure granulite facies. The obtained pressure and temperature values were the highest among the three studied domains. The rocks of the Italva Domain yield temperature values of the transition zone between upper anfibolite and granulite facies conditions. Low to medium pressure values were obtained for this domain.
Tupinambá, Miguel Antonio. "Evolução tectônica e magmática da faixa Ribeira na região serrana do Estado do Rio de Janeiro." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/44/44134/tde-18112015-100759/.
Full textThe highlands of the Rio de Janeiro State, Brazil, known as Serra dos Orgãos, is constituted by granites and gneisses generated or reworked during the Brasiliano Cycle, at the transition between Neoproterozoic and Cambrian. It is located at the Central segment of the Ribeira Belt, which runs along the South Atlantic Coast and was formed at Brasiliano event. The Ribeira Belt is divided by the Central Tectonic Boundary into two terranes: the Occidental and the Oriental. The studied area is located in the latter terrane, near the cities of Nova Friburgo, Sumidouro e Cordeiro. Field and petrographic studies as well as geochemical and isotopic analyses from selected samples allowed to propose a whole historical evolution of a Brasiliano Orogen. A pre-collisional magmatism represented by tonalitic and dioritic gneisses from the Rio Negro Cmplex and by hornblende gabbro small stocks is the earliest recognizable geological process. The calcic magma series tonalite-trondhjemite with (\'épsilon\'Nd) 600 Ma of -0,9 suggest that its tectonic environment was as an oceanic island arc, since 630 Ma (U/Pb zircon age). At 600 Ma ago (Pb/Pb zircon age) the Rio Negro collided with a passive margin (the Occidental Terrane) resulting in crustal thickening, partial melting of metassediments and muscovite leucogranite generation. After the arc/continent collisions a new magmatic arc, at this time with continental setting, is represented by the Serra dos Órgãos batholith. The calcic series tonalite-granodiorite-granite has crystallized at 560 Ma and a slightly older leucocratic peraluminous BSO facies suggest crustal contamination. The cessation of the BSO magmatism was accompanied by a thermal relaxation and tectonic extrusion of the Oriental Terrane to the upper crust. The uplift was so geologically fast that crystalline rocks from this Terrane had experienced distensional collapse, and broke into twelve NW trnding ductile-ruptile shear zones. These large structures had controlled the magma transport of the post-collisional granite laccoliths and sill from the Nova Friburgo massif. The Rb/Sr isochronic analyses from the granites yielded ages between 500 and 480 Ma, which are the last orogenic ages ever found in Ribeira Belt.
Salomão, Marcelo dos Santos. "Mapeamento geológico em áreas graníticas intemperizadas em regiões montanhosas tropicais: o granito Conselheiro Paulino (Faixa Ribeira)." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=2427.
Full textIn the present work, we integrate field geological mapping, regional airborne geophysical data and high resolution (1 m) satellite images to provide a detailed geological map of the Conselheiro Paulino granitic pluton in the Ribeira Belt, Brazil. The studied area has few outcrops and other issues that limit the traditional geological mapping. Landslides are common in the highly weathered portion of the granite. The use of high-resolution images allowed the identification of the few available outcrops and other elements such as ravines, aluvial plains, eluvial deposits, vegetation and roads. This was important to guide and optimize the fieldwork surveys. The available magnetic and radiometric airborne geophysical data corroborate field and petrographic data about the Conselheiro Paulino granite pluton. The pluton can be divided into two distinct facies, one with microgranitic and the other with microgranodioritic composition.
Salazar, Carlos Alejandro. "Anisotropia de suscetibilidade magnética dos plútons Ribeirão Branco, Sguário e Capão Bonito e implicações tectônicas para a Faixa Ribeira (Domínio Apiaí, SP)." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/44/44141/tde-30062010-110127/.
Full textThe fabric of granitic magmas emplaced in the middle and upper crustal levels can be caused by the stress action during the ascension and convection of plutons and/or tectonic strain. Several mechanisms can contribute for the previous thing, nevertheless the interaction between the distortions and tectonic is the domineering one, principally in granites located in orogenic belts. In the Apiaí domain of the Ribeira belt (SP-PR) the elongated granitic batholiths have been historically classified like syn-tectonic and them was emplaced during the development of a neoproterozoic continental magmatic arch. Small Plutons with subcircular to oval forms generally discordant with regard to the disposition of the regional structures and that in turn possess feldspars of reddish typical colour, had been considered pos-tectonic, and therefore, emplaced after the collision that joined the different litho-tectonic units that constitute the Ribeira orogenic belt. This schematic classification of these granites relicts on geochemistry and geochronology data. In this study was identified and recorded in map the internal fabric of the syn-tectonic Ribeirão Branco granite and of the pos-tectonic Capão Bonito and Sguário granites using the anisotropy of magnetic susceptibility (AMS) with the aim of inserting them appropriately in the models of tectonic classification whose basic premises are of structural nature. The porphyritic Ribeirão Branco and Itaóca granites have a high magnetic susceptibility (k = 10-2 SI), which is minor than (k = 5 x 10-3 SI) in the red granites (Capão Bonito, Sguário). In the first ones the poor Ti magnetite is the main source of susceptibility, commonly associated to titanite, biotite and amphibole. In the red granites, the susceptibility is provided by magnetite variability rusty (maghemite) and Ti - hematite (hemo-ilmenite), in addition to the significant contribution of biotite altered by hydrothermal processes. The grade of anisotropy rise (P) in the porphyritic granites (P = 1,14 SD. 0,08) and this is bigger than in the red ones (P = 1,07, SD. 0,05). In the Ribeirão Branco pluton, the high value of P is attributed to an incipient foliation detected in several sectors, which contrasts with the microstructure seemingly isotropic of the red granites. The study of the fabrics of silicates in the porphyritic granites Ribeirão Branco and Itaóca revealed that the orientations of the main axes of AMS and of shape preferred orientation (SPO) of feldspar and mafic silicates (biotite + amphibole) are congruent, nevertheless some obliquities occur. Those obliquities are attributed to the influence of the proper characteristics (form, size, anisotropy) of the marker minerals of the respective sub fabrics. In the same way, the above-mentioned study of silicates fabric demonstrated that P tends to grow up with the intensity of the SPO of silicates, which allowed to identify domains with major magmatic distortion into de granitic bodies and to correlate them with the regional structure. In general, the magnetic fabric of the Ribeirão Branco granite is organized coherently with the tectonic regional sinestral strike-slip shear zones; nevertheless, in the western sector the orientation of the magnetic fabric was likely modified by the accommodation of the Sguário granite. In the Itaóca granite, the organization of the magnetic fabric is different if compared with fabrics of the previous pluton. In Itaóca granite was recorded a fabric with a concentric organization in 623 ± 10Ma. (MSWD 0,31), according to the concordant U-Pb (SHRIMP) age in zircons obtained for the crystallization of the granite, that seems to be occurred before the strain related with the activation of the regional strike-slip shear zones. Geochronology data of the literature indicates that the Capão Bonito granite is approximately 15 Ma. younger than the batholiths of porphyritic granite. The Capão Bonito granite has an organized fabric typical of syn-tectonic intrusions that has an excellent alignment of the magnetic lineation. In the granite Sguário, the fabric has a spiral organization, in the same way as recorded in Capão Bonito, like response to a strain associated with to a small strike-slip shear zone with W-E direction. This event would be related to the reactivation of the Ribeira strike-slip shear zone, which affected the south sector of the Itaóca granite, with the participation of an extensional component. The W-E transtensive deformation that favoured the injection of the red granites in the Apiaí Domain likely was subsequent to a main tetonomagmatic event and this should have been the responsible by the emplacement and strain in the porphyritic granites. The intrusion of the big granitic bodies ~ 615 Ma. and could be it related to the convergence between crustal blocks and to the consequent stretching sub parallel of the Ribeira belt, in which the distortion was located remarkably in the strike-slip shear zones with NE-SW direction.
Lobato, Marcela de Carvalho. "Proveniência sedimentar do grupo São Fidélis, terreno oriental da Faixa Ribeira com base em dados U-Pb." Universidade do Estado do Rio de Janeiro, 2013. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6425.
Full textThe Costeiro domain integrates the Oriental terrane of the Ribeira belt that encompasses arc related rocks of the Rio Negro complex (ca. 790-605 Ma). These orthogneisses display a well documented subduction signature and are intruded on high-grade metassedimentary rocks of the São Fidélis group. Both units are crosscut by syn to late collisional granitoids related with the development of different stages of the Brasiliano Orogeny (ca. 605-480 Ma). U-Pb (LA-ICP-MS) data of detrital zircons from quartzites of the top unit of the São Fidélis group yielded a large spectrum of ages in the Mesoproterozoic and Paleoproterozoic, with subordinated grains in the Archaean and Neoproterozoic. In a synthetic resume, the results are: a) concordant Archean ages of the ca 2,85, 2,84 e 2.70 Ga; b) Paleoproterozoic zircons with maximum in ca. 2.2 Ga (second larger peak); c) Mesoproterozoic grains with two maximums at ca. 2.3 a 1.7 Ga and ca 1.5 Ga (larger peak); d) Neoproterozoic zircons of ca. 0.95-0.90 Ga and 0.86-0.61 Ga. The youngest detrital zircon of ca 613 Ma brackets the sedimentation of the top unit. In several zircons, metamorphic overprints (tips) were identified, with ages between ca. 602-570 Ma. Data from the Rio Grande and the biotite orthogneisses, previously interpreted as belonging to the syn-collisional granites and an homogeneous layer within the basal unit of the São Fidélis Group, rendered similar ages of ca. 620 Ma and are considered as equivalents of this unit. Connecting all the obtained data a possible interpretation is that the basal unit of the São Fidélis intruded by arc related rocks were the source area for the upper unit of the group that should be interpreted as coeval with the Rio Negro Arc evolution. U-Pb (ID-TIMS) of monazite crystals yielded the two metamorphic episodes detected at central Ribeira belt. Two monazites of a quartzite together with two crystals of the Rio Grande orthogneiss are discordant, with an upper intercept of ca. 603 Ma. On the other hand one monazite of the Rio Grande orthogneiss rendered the late metamorphic episode of the belt at ca. 535 Ma.
Dias, Deidimar Aparecida. "Características de campo, petrografia e litogeoquímica da Unidade Santo Aleixo em sua localidade-tipo." Universidade do Estado do Rio de Janeiro, 2008. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=906.
Full textA Unidade Santo Aleixo, em sua localidade-tipo, é representada por gnaisses homogêneos, e, mais restritamente, por gnaisses bandados e gnaisses com inclusões máficas e félsicas. Todos os tipos litológicos mostram contatos gradacionais entre si. Na área de pesquisa, ocorrem ainda leucognaisses, migmatitos, granitos tardios e diques de diabásio. A área é marcada por foliação principal com trend NE e mergulho de baixo a médio ângulo, ora para SE ora para NW, relacionado a dobramento com traço do plano axial NE-SW. Foram descritas zonas de cisalhamento dúcteis a rúpteis de fases deformacionais tardias. A análise modal dos diversos tipos gnáissicos revelou uma composição tonalítica a granítica e menos comumente, quartzo-monzodiorítica e quartzo-monzonitica. A biotita está sempre presente podendo ou não vir acompanhada de hornblenda. Os acessórios mais comuns nessas rochas são apatita, zircão e opacos, enquanto titanita e allanita são mais variáveis, e às vezes podem estar ausentes. É rara a presença de granada que apenas foi observada em uma amostra do gnaisse homogêneo. Observou-se cloritização de biotita e sericitização e formação de muscovita a partir de plagioclásio. Os resultados geoquímicos apontam para a existência de apenas um grupo subalcalino disposto ao longo de um trend calci-alcalino. A maioria das amostras são metaluminosas a fracamente peraluminosas. Os gnaisses apresentam valores de terras raras pesadas inferiores a 10 ppm, o que resulta em elevadas razões (La/Lu)N. As comparações petrográficas e litogeoquímicas entre a Unidade Santo Aleixo e do Complexo Rio Negro mostram que: a) a Unidade Santo Aleixo compreende uma série petrográfica expandida enquanto que o Complexo Rio Negro é representado por séries mais restritas; b) o quimismo das duas unidades é semelhante, e representa um magmatismo calci-alcalino metaluminoso à biotita e hornblenda; c) as unidades são semelhantes em termos de ambientação tectônica, representando um ambiente do tipo arco vulcânico; d) os gnaisses da Unidade Santo Aleixo são empobrecidos em terras raras pesadas em comparação aos gnaisses do Complexo Rio Negro; comportamento causado pela presença de granada na fonte geradora. A inclusão da Unidade Santo Aleixo no Complexo Rio Negro, portanto, é sustentada pelas semelhanças petrográficas e geoquímicas, entendendo-se que o Complexo inclui tipos magmáticos com modos de evolução e fontes diferentes.
The Santo Aleixo Unit in its type-location is represented by homogenous gneiss and subordinated banded and inclused mafic-felsic-rich gneisses, all rocks separated by gradational contacts. Leucogranitic gneiss, migmatites, late-tectonic granite stocks and diabase dikes also occur in the studied area. The gneissic foliation dips to SE or NW with low to medium angles according to large vertical folds with a NE trending axial plane. The main foliation is deformed by late tectonic ductile to brittle shear zones. The gneisses are classified as tonalites to granites and, subordinated quartz-monzodiorites and quartz-monzonites. Biotite is always present with or without hornblende. Garnet was described only in the homogenous gneiss. Apatite, zircon, opaque minerals and minor titanite and allanite are the acessory minerals. Biotite chloritization and plagioclase sericitization are the observed metamorphic-hidrotermal processes. Lithogeochemical data classify the Santo Aleixo Unit gneisses as metaluminous metaigneous rocks from a calc-alkaline sequence. Heavy REE concentrations are lower than 10 ppm, resulting in elevated (La/Lu)N ratios. Comparing petrographic and lithogeochemical data from the Santo Aleixo Unit and the Rio Negro Complex points to the following statements: a) Santo Aleixo Units petrographic series are expanded while Rio Negro Complexs series are more restricted; b) the units presents same chemical signatures (calc-alkaline volcanic arc metaluminous magmas with biotite and hornblende); c) the Santo Aleixo Unit gneisses are depleted in heavy REE related to the presence of garnet at the magma source. Therefore, the incorporation of the Santo Aleixo Unit into the Rio Negro Complex is sustained by petrographic and lithogeochemical similarities, and also makes clear that the arc magmatism had different sources and evolutionary paths.
Silva, Beatriz Yuri Benetti. "Evolução tectônica da porção central do terreno Embu ao norte da zona de Cisalhamento Taxaquara-Guararema." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/44/44143/tde-22082017-084753/.
Full textThe Embu Terrane is located in the Ribeira Belt, it is separated by north for the Caucaia-Rio Jaguari shear zone, by south for the Cubatão shear zone and it is cut across the Taxaquara-Guararema shear zone and it is formed during the Neoproterozoic orogenic Brasilian cycle. This Terrane is formed by orthognaisses infrastructure Rio Capivari Complex, a sequence of metassedimentary rocks divided in two units: Paragnaisses and schists and quartzites and a wide number of granites that compose around of 30% of the Terrane. Through the field data, petrography, geocronology, geochemistry in whole-rock and isotopic Lu-Hf in zircon and Sm-Nd in whole-rock, it was possible to evidence different evolution stages for the Embu Terrane rocks. The Complex Rio Capivari rocks recorded a story of 400 m.y, the first event in the Siderian (2,4 Ga) related to the island arc formation with juvenile isotopic signature that evaluated to a continental active margin during the Riaciano (2,18 to 2,14 Ga) with magmatism related to Archean crust, the juvenile record is understand how the stage of continental margin where it happened retraction slab and at least in the Orosirian (2,01 Ga) the rocks have continental crust signature in probably collision regime. Isotopic evidences show that these rocks don\'t compose the basement of metassedimentary sequence. The metassedimentary rocks have the maximum depositional age inferred from the youngest detritic zircon age of 980 Ma, Tonian and the zircon detritic age are concentrate mainly Mesoproterozoic between 1,0 and 1,2 Ga and with a secondary concentration of 1,8 . Through the granitic magmatism and metamorphic data it was identified three tectonics events that affect the Terrane Embu. The first happened between 810-780 Ma and it was recorded in the orthogneisses with tonaliticmonzogranitic peraluminous, interpreted how formed in an environment of continental arc magmatic whose the magmatism in the finals stages admits contamination by the metassedimentary rocks. The second event between 705 and 660 Ma is printed in the tonian orthogneisses deformation and in the Serra do Quebra-Cangalha Batholith formation. At least, the final event between 630 and 575 Ma was related with the proto-continent Paranapanema-São Francisco collision, it had begin in 630 Ma with the active continental margin formation with metaluminous magmatism. The collision happened between 615 and 604 and the magmatism peraluminous between 595-580 Ma print the collision finals stages with orogen exhumation. The accretion of Rio Capivari complex on Embu Terrane is interpreted how it been related to this last tectonic event.
Caltabeloti, Fabrizio Prior. "Alojamento e deformação de plútons graníticos da extremidade nordeste da Suíte Intrusiva Cunhaporanga (Domínio Apiaí - Faixa Ribeira, PR)." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/44/44141/tde-16082011-170032/.
Full textGranite plutons located on the northeast of Cunhaporanga Intrusive Suite (Patrimônio Santo Antônio, Ouro Verde, São Domingos and Santa Rita) are emplaced into low grade metasedimentary rocks (Itaiacoca Group) of the Apiaí Domain (Ribeira Belt). Most of these plutons are isotropic with pinkish to grey colors and their compositions vary from monzogranite to sienogranite. They are usually porphyritic and locally inequigranular and equigranular. Regional mapping revealed that the foliation of the metasedimentary host rocks dips mainly to NE while the lineation (intersection, mineral) strikes in the NNW-SSE direction. The host rocks metamorphic fabric rotates progressively to become parallel to the NE-trending Itapirapuã transcurrent shear zone. Kinematic markers such as elongated quartz grains and mica-fish from quartz-milonites indicate the Itapirapuã shear records a sinistral movement. The fabric of the plutons was studied by anisotropy of magnetic susceptibility (AMS) technique. Forty sites (300 specimens) were sampled at the Patrimônio Santo Antônio granite, 7 sites (48 specimens) at São Domingos, 9 sites (67 specimens) at Ouro Verde and 14 sites (92 specimens) at Santa Rita granite. The mean of magnetic susceptibility (k) is higher in Patrimônio Santo Antônio granite (k = 23,29 x \'10 POT.-3\' SI) and lower in the granites of Santa Rita (k = 11,85 mSI), São Domingos (k = 7,43 mSI) and Ouro Verde (k = 7,46 mSI). In contrast the magnetic anisotropy (P) is lower in the Patrimônio Santo Antônio granite (P = 1,09 ± 0,04) and higher in the granites São Domingos (P = 1,21 ± 0,09), Ouro Verde (P = 1,19 ± 0,07) and Santa Rita (P = 1,23 ± 0,11). Thermomagnetic and Isothermal Remanent Magnetization (IRM) studies show that Ti-poor magnetite is the principal carrier of rock magnetic properties but that includes minor contributions of Ti-hematite. Iron oxides are frequently associated with titanite, biotite and amphibole. Microstructures are typically magmatic, except for Santa Rita granite which shows post-magmatic recrystallized microstructures. The magnetic foliation of granitic plutons dips smooth to moderately and for the Patrimônio Santo Antônio body it exhibits a typical dome pattern. The subhorizontal magnetic lineation strikes NNW-SSE parallel to regional folding axe of the metasedimentary rocks. This feature shows that the granites are syntectonic to a deformation event apparently connected to NE-trending transcurrent shears. The occurrence of a foliation dome in the Patrimônio Santo Antônio pluton and prolate magnetic ellipsoids in São Domingos pluton suggest that the NNW-trending structures includes, besides a strike-slip shear fabric, a component of extension that probably assisted the emplacement of the plutons. A U-Pb (SHRIMP) determination in the Patrimônio Santo Antônio zircons have produced a concordia age of 589 ± 6 Ma attributed to the crystallization of the granite. These results indicate that in the latest stages of the development of the Cunhaporanga Intrusive Suite the Apiaí Domain was submitted to a regional strain field recording transcurrent simple shear and extension.
Book chapters on the topic "Faixa Ribeira"
Porto, R., B. P. Duarte, A. Esteves, and J. G. Valença. "Gnaisses ortoderivados pré e sin-colisionais: petrologia, geoquímica e ambiente tectónico: segmento central da Faixa Ribeira (Rio de Janeiro, Brazil)." In Para conhecer a Terra: memórias e notícias de Geociências no espaço lusófono, 289–97. Imprensa da Universidade de Coimbra, 2012. http://dx.doi.org/10.14195/978-989-26-0534-0_30.
Full textConference papers on the topic "Faixa Ribeira"
Sand L.A. de França, George, and Marcelo Assumpção. "O Estudo Da Estrutura Da Crosta Na Faixa Ribeira, Se Do Brasil, Usando A Função Do Receptor." In 7th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2001. http://dx.doi.org/10.3997/2214-4609-pdb.217.318.
Full textS. Salomão, Marcelo, Paulo T.L. Menezes, Miguel Tupinambá, and Miguel A. Mane. "Mapeamento Geológico Moderno: Uso Da Aerogeofísica No Suporte À Cartografia De Maciços Graníticos Da Faixa Ribeira Na Região Serrana Do Estado Do Rio De Janeiro." In 11th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2009. http://dx.doi.org/10.3997/2214-4609-pdb.195.1994_evt_6year_2009.
Full textSalomão*, Marcelo S., Paulo T. L. Menezes, Miguel Tupinambá, and Miguel A. Mane. "Mapeamento geológico moderno: uso da aerogeofísica no suporte à cartografia de maciços graníticos da Faixa Ribeira na Região Serrana do Estado do Rio de Janeiro." In 11th International Congress of the Brazilian Geophysical Society & EXPOGEF 2009, Salvador, Bahia, Brazil, 24-28 August 2009. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2009. http://dx.doi.org/10.1190/sbgf2009-205.
Full text