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)Files
19030904.pdf
Files
(6.5 MB)
| Name | Size | Download all |
|---|---|---|
|
md5:ec8c2b9d4882333c9e90d9edd2b57b5c
|
6.5 MB | Preview Download |
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