Modelagem magnética e gravimétrica 3D do plug básico cenozoico São João intrusivo em rochas da Bacia Potiguar, NE do Brasil
This dissertation presents a geophysical study of a Cenozoic basic intrusion, involving steps of acquisition, processing, and 2D and 3D modeling of terrestrial magnetic and gravity data. The target studied is a plug known as São João, located in the southern border of the Potiguar Basin (NE Brazi...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/21698 |
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| Resumo: | This dissertation presents a geophysical study of a Cenozoic basic intrusion,
involving steps of acquisition, processing, and 2D and 3D modeling of terrestrial
magnetic and gravity data. The target studied is a plug known as São João, located in
the southern border of the Potiguar Basin (NE Brazil). This plug has an area of
approximately 0.5 km² and was formed by magmatism Macau. Sandstones and
limestones near the hipoabissal body suffered metamorphization with significant
thermal changes. We use airborne magnetic data named Potiguar Basin Project and
terrestrial acquisition, which resulted in 5698 readings with the total field magnetometer
and 128 gravity stations with CG5 gravimeter. The map of vertical derivative of the
total magnetic intensity anomalies from the airborne data contextualized regionally the
geology and geophysics of the Potiguar Basin, while the terrestrial magnetic and
gravimetric data detailed the plug São João and were used for the modeling. Magnetic
susceptibility and density were measured in metamorphic (buchites) igneous (diabase)
and sedimentary (sandstone and limestone) rock samples. Such measures help to
constrain the 2D and 3D modeling, which reveal the internal architecture of the São
João plug, whose maximum depths reach 400 m. The gravity model of the plug shows a
lopolith shape, with a region in the northeastern part of the body having higher density
contrast. This region is also observed in the magnetic model with high contrast of
magnetic susceptibility. Gravity highs closer to São João plug indicate three regions
with high density contrasts, which probably are igneous bodies with no surface
expression. |
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