Ribeira Belt
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Evolução de terrenos tectono-metamórficos da Serrania do Ribeira e Planalto Alto Turvo (SP, PR) / Evolution of tectono-metamorphic terranes of the Ribeira Ridge and Alto Turvo Plateau, SE Brazil
Numerous Precambrian terranes of enigmatic origin are recognized in the Ribeira Valley and Alto Turvo Plateau regions (Southeastern Brazil), based on contrasting evolutive histories and distinct lithotectonic, metamorphic and structural patterns. These suspect terranes form three major composite terranes juxtaposed during the late Brasiliano Cycle: Apiaí Te
Publicado em: 2008
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14. Evolução geológica do terreno Paraíba do Sul, Orógeno Ribeira, Sudeste do Brasil, com base em estudos litogeoquímicos e de geocronologia U-Pb (LA-ICPMS) / Geological evolution of Paraiba do Sul terrane, Orógeno Ribeira belt, southeastern Brazil, base onlitogeochemical studies and U-Pb (LA-ICPMS)
A estrutura crustal do Orógeno Ribeira pode ser definida, em seu segmento central, por alguns terrenos tectono-estratigráficos distintos entre si, e limitados por empurrões por sobre o Cráton de São Francisco e zonas de cisalhamento oblíquas, resultado de sucessivos eventos de colagem no Brasiliano. Neste contexto, o Terreno Paraíba do Sul se apresent
Publicado em: 2008
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15. Structural geology of northern limb of the Paraiba do Sul river divergent structure: cross-sections Três Rios (RJ) - Matias Barbosa (MG) and Barra do Piraí - Conservatória (RJ) / Geologia estrutural da aba norte da estrutura divergente do rio Paraíba do Sul: seções Três Rios (RJ) - Matias Barbosa (MG) e Barra do Piraí - Conservatório (RJ)
This study is about the structural geology of a portion of the Central Mantiqueira Province which corresponds to the north side of the structural divergence of the Rio Paraíba do Sul valley. Two geological cross-sections (Três Rios - Matias Barbosa and Barra do Piraí - Conservatória) provided geometrical and kinematics data. Lattice preferred orientation
Publicado em: 2008
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16. 40Ar/39Ar ages (600-570 Ma) of the Serra do Azeite transtensional shear zone: evidence for syncontractional extension in the Cajati area, southern Ribeira belt
Este trabalho apresenta idades 40Ar/39Ar de rochas da Zona de Cisalhamento Transtrativa Sinistral da Serra do Azeite, situada na parte sul do cinturão Ribeira, entre os Estados de São Paulo e Paraná, bem como discute a correlação regional e as implicações tectônicas com outras partes do cinturão. Os dados geocronológicos sugerem que a deformação
Anais da Academia Brasileira de Ciências. Publicado em: 2007-12
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17. A interação entre os eventos tectônicos e a evolução geomorfológica da Serra da Bocaina, Sudeste do Brasil / The interaction between tectonic events and the landscape evolution of Bocaina Ridge, Southeastern Brazil
The Bocaina Ridge landscape is strongly controlled by both ductile and brittle structures related to the Ribeira Belt (Brasiliano Orogeny ca. 790-480Ma) and also to the mesozoic-cenozoic reactivations. The rocks were subdivided in four tectonic terrains accreted in the brasiliano collisional stages. The most prominent structures related to these collisions a
Publicado em: 2006
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18. "Estudo geológico-geocronológico dos terrenos granito-gnáissicos e sequências metavulcanossedimentares da Região do Betara (PR)" / "Geologic-geochronologic study from the granite-gnaissic terranes and metavolcanossedimentary sequences from Betara Region (PR)"
The Betara region was located at nothwest of the Curitiba City between the Campo Largo and Rio Branco do Sul municipal districts. This region includes granite-gnaissic rocks, proto to milonitics (Betara Nucleous) and metavolcanossedimentary sequences with low to intermediate metamorphic grade (Betara Formation). These terrains occur at the southern portion o
Publicado em: 2006
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19. "Tectônica rúptil mesozóico-cenozóica na região da Serra dos Órgãos, RJ" / "Mesozoic-Cenozoic brittle tectonics of the Serra dos Órgãos range, RJ"
Mezosoic-Cenozoic brittle tectonics of the Serra dos Órgãos range in the Rio de Janeiro State, southeastern Brazil, was investigated using morphostructural analysis and field surveys. The study area is a sector of the Serra do Mar coastal range, with summits over 2.200 m a.s.l., and is included in the central segment of the Neoproterozoic-Cambrian Ribeira
Publicado em: 2006
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20. Evidence of mingling between contrasting magmas in a deep plutonic environment: the example of Várzea Alegre, in the Ribeira Mobile Belt, Espírito Santo, Brazil
No final do ciclo tectônico que originou o segmento norte do Cinturão Móvel Ribeira (de idade Proterozóica Superior a Paleozóica), uma série de complexos plutônicos tardi- a pós-colisionais, consistindo de larga gama de litotipos, intrudiu todas as unidades metamórficas. O Complexo Intrusivo de Várzea Alegre é um desses complexos pós-colisionais.
Anais da Academia Brasileira de Ciências. Publicado em: 2001-03
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21. Evolução geologica dos terrenos de alto grau metamorfico da Faixa Ribeira na região de Juiz de Fora, Minas Gerais
The orthogneisses of the Ribeira Belt, in the Juiz de Fora area, were submitted to a sequence of geologic processes during times previous to Ett Brasiliano (tectono-thermal event), that generated this belt. The present study intends to recover and to reconstitute the geological evolution related to these processes. The units are distributed in two main tecto
Publicado em: 1999
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22. Analysis of the stromatolites from the Itaiacoca Group (Proterozoic) from south Itapeva, State of São Paulo, Brazil / Análise dos Estromatólitos do Grupo Itaiacoca (Proterozóico), ao Sul de Itapeva, SP
Stromatolites were studied at nine localities south of Itapeva, São Paulo, Brazil, generally in light-gray metadolostones and secondarily in dark-gray metalimestones of the Itaiacoca Group, a Mesoproterozoic volcanosedimentary unit of the Ribeira Belt. Five columnar forms were distinguished, the most common consisting of unbranched, coniform columns, with c
Publicado em: 1999
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23. Geoquimica e impacto ambiental do arsenio no Vale do Ribeira (SP-PR)
The sedimentary and volcanic rocks of the Ribeira Valley, in the Apiaf FoId Belt, host a variety of PbZn deposits, which were formed by singenetic (Perau-type) and epigenetic (Panelas-type) models. Long-term mining activities originated a toxic contamination by arsenic in the stream sediments of the Ribeira de Iguape river that drains the region. The purpose
Publicado em: 1997
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24. O complexo mafico-ultramafico de Tijucas do Sul, correlação com o complexo de Pien, PR e considerações metalogeneticas
The study aimed primarily to assess the auriferous deposits potential of gneissic terrains of medium to high metamorphic grade, with lenticular mafic-ultramafic bodies, which outline the suture zone between the Ribeira Belt and the Luís Alves Craton, at the southern border between paraná and Santa catarina. Geological mapping at 1:25.000 scale has been car
Publicado em: 1993