Diagenesis
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Microfacies and diagenetic evolution of the limestones of the upper part of the Crato Formation, Araripe Basin, northeastern Brazil
Abstract This paper presents the results of a petrographic and diagenetic study of the laminated limestones of the upper part of the Aptian to Albian Crato Formation, northeast of Brazil. The applied techniques were optical microscopy, cathodoluminescence and scanning electron microscopy (SEM) coupled to a wavelength-dispersive spectrometer (WDS). Petrograph
Braz. J. Geol.. Publicado em: 08/04/2019
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2. Pedodiagenetic Characterization of Cretaceous Paleosols in Southwest Minas Gerais, Brazil
ABSTRACT The influence of post-burial geological processes on preserving pedogenic properties has great importance in identifying ancient paleosols both in the field and in a laboratory. However there are not many publications that focus on characterizing paleosol diagenesis. As temperature and pressure progressively increase, evidence of pedogenesis is modi
Rev. Bras. Ciênc. Solo. Publicado em: 06/02/2017
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3. Barium and its Importance as an Indicator of (Paleo)Productivity
ABSTRACT Barium (Ba) is a trace element which occurs predominantly as barite mineral (BaSO4) in the marine environment. Previous work suggests that barite concentrations are related to the organic carbon flux and marine biological debris in the water column suggesting a direct or indirect involvement in the marine biological cycling. In addition, barite has
An. Acad. Bras. Ciênc.. Publicado em: 2016-12
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4. Beachrocks do Rio Grande Do norte: correlação entre os depósitos costeiros e os de zona costa-afora com base na faciologia, petrografia e diagênese
Beachrocks são rochas sedimentares formadas pela cimentação de sedimentos praiais por carbonato de cálcio em especial, calcita e/ou aragonita em zona de estirâncio. A ocorrência dessas rochas é bastante comum em diversas partes do globo, sobretudo em regiões com latitudes inferiores a 40. O Rio Grande do Norte possui grande quantidade de beachrocks,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/04/2011
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5. Biogeochemistry of the Amazonian floodplains insights from six end member mixing models.
2010
Earth Interactions. Publicado em: 2011
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6. Fontes e distribuição de matéria orgânica sedimentar no complexo estuarino-lagunar de Mundaú-Manguaba/AL, utilizando esterois e alcoóis como indicadores
The origin of the sedimentary organic matter in the Mundaú-Manguaba estuarine system was evaluated through the distribution and composition of sterols, alcohols and ancillary data. The muddy sediments of the lagoons are enriched in organic matter, derived from a mixture of autochthonous and allochthonous inputs. Mundaú exhibited moderate contamination by s
Química Nova. Publicado em: 2011
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7. Rb-Sr systematics of holocene pelitic sediments and their bearing on whole-rock dating
In many cases, when dealing with argillaceous fine-grained sedimentary rocks, the isotopic ages obtained from Rb–Sr whole-rock isochron calculations are of geological significance, despite the fact that the initial conditions of Sr isotopic homogenization are not fulfilled. To explain this, a mechanical mixing during deposition has been suggested, leading
Publicado em: 2011
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8. Controles deposicionais sobre a composição primária, padrões diagenéticos e porosidade dos depósitos mistos siliciclásticos-carbonáticos dos campos de fazenda Santa Luzia e fazenda São Rafael, Bacia do Espírito Santo
A Bacia do Espírito Santo, situada na costa do estado homônimo, margem leste brasileira, contém algumas das mais importantes descobertas recentes de petróleo no país. Os reservatórios dos campos de Fazenda Santa Luzia e Fazenda São Rafael são constituídos por depósitos do Grupo Barra Nova (Albiano), e caracterizados pela intercalação de rochas si
Publicado em: 2011
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9. Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
Coastal-eolian sabkha sandstones from different ages and basins show similar diagenetic patterns, which understanding is important for their evaluation as geochemical systems and as hydrocarbon reservoirs. The Carboniferous sandstones of the Juruá Formation (Solimões Basin) are one of the most important gas reservoirs of Brazil. The sandstones and interbed
Publicado em: 2010
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10. Datação de processos diagenéticos em arenitos-reservatório de hidrocarbonetos : uma revisão conceitual
Geochronology has became a powerfull tool for diagenetic studies in siliciclastic rocks as it supply parameters for the definition of their depositional or diagenetic ages. This development occurred particularly in the last decades, with analytical techniques improvements and application of oil exploration. Sandstones are important hydrocarbon reservoir-rock
Publicado em: 2010
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11. Diagenetic pattern of vertebrate fossils from the traversodontidae biozone, Santa Maria formation (Triassic), southern Brazil
Dois afloramentos da Biozona de Traversodontidae, localizados nos municípios de Santa Cruz do Sul e Venâncio Aires, foram analisados em relação ao seu padrão diagenético. Os afloramentos apresentam um conteúdo faunístico muito semelhante, dominado pela presença de cinodontes não-mamalianos e, também, um padrão bioestratinômico comum a ambos, con
Publicado em: 2010
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12. Análise e avaliação dos problemas existentes na fachada de arenito do Museu Júlio de Castilhos, Porto Alegre, RS
The Júlio de Castilhos museum of Porto Alegre, formerly used as residence, was built in 1877 by a military engineer Catão Roxo. This building is one of the few examples of urban architecture from the last part of the nineteenth century. Its façade is covered by arenitic and granitic rocks quarried near the city. The covering shows the effects of weatherin
Publicado em: 2010