Published 1980 | Version v1
Miscellaneous Open

Application of carbon and oxygen stable isotopes to the study of Brazilian precambrian

Description

Samples of carbonated rocks of precambrian age are studied. The stable carbon and oxygen isotopes are applied to the study of terrestrial materials considering the variations of some element isotopic composition in function of the environment of sedimentation. The isotopic analysis was done using mass spectrometers. The analytical results and the description of region geology of the site of each sample are presented. The isotopic data are interpreted aiming to the environment of sedimentation. New techniques for better improvement of carbon and oxygen ratios, are proposed, such as: to use the analysis of surface trend and the isotopic logging in mapping of surface and subsurface. A new method for approximated determination of the ages of precambrian carbonated rocks, considering the limitations of their new technique, is also presented. (M.C.K.)

Abstract (Portuguese)

Amostras de rochas carbonatadas de idade pre-cambriana sao estudadas. Aplicam-se os isotopos estaveis de carbono e oxigenio ao estudo de materiais terrestres considerando-se as variacoes da composicao isotopica de alguns elementos em funcao de seu ambiente de sedimentacao. A analise isotopica foi feita usando-se espectrometros de massa. Os resultados analiticos e a descricao da geologia regional do local de cada amostra sao apresentados. Os dados isotopicos sao interpretados visando-se seu ambiente de sedimentacao. Propoem-se novas tecnicas para melhor aproveitamento das razoes de carbono e oxigenio, tais como: usar a analise de tendencia superficial e a perfilagem isotopica no mapeamento de superficie e sub-superficie. Apresenta-se tambem um novo metodo para a determinacao aproximada de idades de rochas carbonatadas do precambriano, considerando-se as limitacoes desta nova tecnica. (Autor)

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Additional details

Additional titles

Original title (Portuguese)
Aplicacao dos isotopos estaveis de carbono e oxigenio ao estudo do precambriano brasileiro

Publishing Information

Imprint Pagination
276 p.
Report number
INIS-BR--958

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
19030904
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
AGE ESTIMATION; BRAZIL; CARBON ISOTOPES; CARBONATE ROCKS; GEOLOGY; MASS SPECTROMETERS; OXYGEN ISOTOPES; STABLE ISOTOPES
Descriptors DEC
DEVELOPING COUNTRIES; ISOTOPES; LATIN AMERICA; MEASURING INSTRUMENTS; ROCKS; SEDIMENTARY ROCKS; SOUTH AMERICA; SPECTROMETERS