Aplicação dos métodos geofísicos elétrico e eletromagnético na determinação de unidades sedimentares costeiras tropicais em Bragança, Nordeste do Pará
This thesis shows the application of geophysical methodology on several deposition environments of the Planície Costeira Bragantina (Bragantina Coastal Plain), which are being studied in the Mangrove Dynamics and Management (MADAM) Project. The aim of the work was to test geophysics on coastal dep...
| Autor principal: | SILVA, Regina Célia dos Santos |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Pará
2014
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/5782 |
| Resumo: |
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This thesis shows the application of geophysical methodology on several deposition
environments of the Planície Costeira Bragantina (Bragantina Coastal Plain), which are being
studied in the Mangrove Dynamics and Management (MADAM) Project. The aim of the work was to test geophysics on coastal deposition environment to help the geological understanding of the recent stratigraphic evolution of the Bragantina Coastal Plain. Geophysical measurements were carried out on several morpho-stratigraphic geological units using: (a) the conventional dc resistivity method, through Schlumberger vertical sounding, and (b) the slingram horizontal loop electromagnetic method, with measurements taken for eight
frequencies. Vertical electric soundings allowed to know the resistivity distribution in subsurface. The
resistivity models could be correlated to geology, but the results were not satisfactory for the
depth of investigation as a result of the environment high condutivity. The electromagmetic method was easier and quicker to apply than the resistivity method. Electromagnetic data were analized in profiles and in electromagnetic soudings. The data allowed
to stablish geological contacts and geophysical signatures for the coastal deposits of the area. |