Sedimentary Provenance
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Provenance of the Ediacaran Salinas Formation (Araçuaí Orogen, Brazil): Clues from lithochemical data and zircon U-Pb (SHRIMP) ages of volcanic clasts
Abstract Salinas Formation occurs in a large region of the Northern Araçuaí orogen, Southeastern Brazil. It includes turbiditic wackes (> 10% matrix) to arenites (< 10% matrix), pelites and clast-supported conglomerates, metamorphosed from the biotite zone of the greenschist facies to the sillimanite zone of the amphibolite facies. Salinas Formation lies u
Braz. J. Geol.. Publicado em: 01/07/2019
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2. Sedimentary and U-Pb detrital zircons provenance of the Paleoproterozoic Piracicaba and Sabará groups, Quadrilátero Ferrífero, Southern São Francisco craton, Brazil
Abstract The Quadrilátero Ferrífero is an important mineral province located in Southern São Francisco craton, SE Brazil. Its prominent feature is the Gandarela syncline that was formed as part of the regional deformation event in the southernmost part of the craton at ca. 2,000 Ma. The syncline exposes several economically important units of Rio das Velh
Braz. J. Geol.. Publicado em: 03/06/2019
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3. Sedimentary provenance in the southern sector of the São Francisco Basin, SE Brazil
ABSTRACT: We present new Sm-Nd, U-Pb and Hf isotope geochronological data for the siliciclastic rocks in the southern sector of the São Francisco Basin. An abrupt change in the Sm-Nd data is observed from the Carrancas Formation’s oligomitic conglomerates (TDM ages between 2.7 and 3.3 Ga; εNd(550 Ma) values between -25.09 and -17.98), its finer facies, a
Braz. J. Geol.. Publicado em: 2018-01
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4. Sedimentologia e cronologia por luminescência da Ilha de São Francisco do Sul (SC): considerações sobre a evolução holocênica de barreiras arenosas da costa sul e sudeste do Brasil / não infomado
São Francisco do Sul Island (SFSI) is located on the northern coast of Santa Catarina State, Brazil. It covers an area of about 265 km2 with an approximate length of oceanic coastline of 40 km. The island was formed by coastal depositional systems active during the relative sea-level changes of the last 120,000 years. The following relative sea -level fall
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/09/2011
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5. Geoquímica e geocronologia sedimentarno estudo das sequências paleozoica e pré-rifte de bacias do nordeste brasileiro
Integrated application of geochemical and sedimentary geochronology in pelitic rock samples from the basal section of the northeastern Brazilian continental margin, especially those of the Paleozoic and pre-rift sequences is the main goal of this thesis. The results are presented and discussed in three technical articles. Two of these articles present the Rb
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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6. Proveniência das areias inconsolidadas do Rio Jacuí - RS
Esta dissertação trata do estudo da assembléia de minerais pesados para a determinação da proveniência dos depósitos de areia inconsolidados do Rio Jacuí e seus principais afluentes, congregando principalmente as bacias hidrográficas do Baixo Jacuí e do Vacacaí-Vacacaí Mirim. O Rio Jacuí é o maior rio do estado do Rio Grande do Sul e, apesar da
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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7. Proveniência de rochas metassedimentares do Greenstone Belt do Rio Itapicuru, Bahia / Provenance of metassedimentary rocks from Rio Itapicuru Greenstone Belt, Bahia
A área em estudo localiza-se entre o embasamento mesoarqueano do Núcleo Serrinha e o Greenstone Belt do Rio Itapicuru (BA). O Núcleo Serrinha é constituído pelo Complexo Santa Luz, caracterizado por rochas metamórficas gnáissico-migmatíticas (Mascarenhas 1979), cobertas pelas vulcânicas do Grupo Capim (Winge 1984, apud. Cruz Filho et al. 2003) e pel
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/03/2010
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8. Áreas fontes dos minerais pesados e sua distribuição sobre a plataforma continental sul-brasileira, uruguaia e norte-argentina
The heavy mineral fraction of sedimentary rocks and sediments can provide important information about provenance in sedimentary basins studies because some minerals or group of minerals can be traced to a source rock or terrain of specific composition. This work is a provenance study based on heavy mineral analyses of samples collected on the Rio Grande do S
Publicado em: 2010
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9. Razões isotópicas 87Rb/86Sr, 87Sr/86Sr e 143Nd/144Nd como traçadores de proveniência de rochas sedimentares siliclásticas: exemplos no Grupo Camaquã(Paleozóico interior; RS, Brasil)
The Rb-Sr and Sm-Nd isotopic systems are ideal in constraining the provenance of fine-grained clastic rocks. This is particularly true for continental, fluvio-lacustrine, sedimentary units deposited under semi-arid climate conditions, where mechanical desintegration of source rocks dominates the weathering processes. Three sets of red-colored, continental si
Publicado em: 2010
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10. Geoquímica de minerais detríticos em estudos de proveniência : uma revisão
The chemical composition of detrital minerals in sediments has become a powerful tool for provenance studies, particularly in the last decades with the improvement of analytical techniques for mineral grains. Major and trace element contents of igneous and metamorphic minerals can reveal the characteristics of their original sources, mainly with respect to t
Publicado em: 2010
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11. Sedimentary facies and provenance of the Bebedouro Formation, Neoproterozoic (BA) / Fácies sedimentares e proveniência da Formação Bebedouro, Neoproterozóico (BA)
The sedimentary record of Neoproterozoic age has become a major subject of research since the rebirth of the models of extreme glaciation and rapid climatic changes for the period, including the Snowball Earth hypothesis. These models are founded on the identification, in all continents, of Neoproterozoic diamictites directly overlain by carbonates, which ar
Publicado em: 2008
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12. Geoquímica de rocha total, geocronologia de u-pb e geologia isotópica de sm-nd das rochas ortognáissicas e unidades litológicas associadas da região ipameri - Catalão (Goiás)
The part of the southern Brasília Belt, Tocantins Province, exposed in central Brazil, comprises metasedimentary rocks, metavolcano-sedimentary sequences, amphibolites and intrusive granites, and a large orthogneiss belt. These units are tectonically imbricated, and vary in metamorphic grade from lower greenschist to amphibolite facies, characterized by a 7
Publicado em: 2008