Biogenic Carbonates
Mostrando 1-4 de 4 artigos, teses e dissertações.
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1. GeoquÃmica de carbonatos da plataforma continental nordeste do Brasil
Com o objetivo de detectar sinais geoquÃmicos de diagÃnese meteÃrica em sedimentos relÃquia, localizados em profundidades inferidas em estudos anteriores como correspondentes a antigas linhas de costa, ao longo da plataforma continental do CearÃ; alÃm de estudar a distribuiÃÃo dos Ãxidos principais analisados em sedimento total em sedimentos de plat
Publicado em: 2008
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2. Caracterização dos fluidos H2S e agua em reservatorios carbonaticos
Reservoir fluids from two basins - Campos and Santos - of East Brazil margin have been studied. Samples from over 16 wells have been utilized in the fluid characterization. Water and hydrogen sulphide (H_) are fluids with large distribution in petroleum fields and may provide important informations for reservoir studies. High H2S concentratios are normally a
Publicado em: 1993
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3. Biogenic Magnetite Formation through Anaerobic Biooxidation of Fe(II)
The presence of isotopically light carbonates in association with fine-grained magnetite is considered to be primarily due to the reduction of Fe(III) by Fe(III)-reducing bacteria in the environment. Here, we report on magnetite formation by biooxidation of Fe(II) coupled to denitrification. This metabolism offers an alternative environmental source of bioge
American Society for Microbiology.
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4. Oceanic minerals: Their origin, nature of their environment, and significance
The chemical and isotopic compositions of oceanic biogenic and authigenic minerals contain invaluable information on the evolution of seawater, hence on the history of interaction between tectonics, climate, ocean circulation, and the evolution of life. Important advances and greater understanding of (a) key minor and trace element cycles with various r
The National Academy of Sciences.