Prospecção de minerais pesados: integração de dados aeromagnéticos, aeroradiométricos e concentrado de bateia para localização de depósitos placeres no Litoral Sul do Rio Grande do Norte
Heavy minerals have densities of 2.9 g / cm³ or greater. In nature, these minerals occur mainly in two types of environments: primary environment, as accessory mineral in their host rocks, and secondary environment, when disaggregated, transported and concentrated giving rise to a placer-type min...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/34341 |
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| Resumo: | Heavy minerals have densities of 2.9 g / cm³ or greater. In nature, these minerals occur
mainly in two types of environments: primary environment, as accessory mineral in
their host rocks, and secondary environment, when disaggregated, transported and
concentrated giving rise to a placer-type mineral deposit. It is noteworthy that although
these minerals have high density, they can travel for short or long distances, this fact
depends on the capacity and energy generated by each carrier. The placeres present
favorable environments to their formation, they are: sand bars, meander of rivers and
regions of confluence. These geomorphological features serve as trappings and are
responsible for trapping the heavy minerals. Depending on the conditions of formation
of these deposits, we can classify them in different types, such as: fluvial, wind, glacial,
marine and transitional placer. The present work aims to use aerogeophysical and
geochemical data to detect shallow anomalies associated with placer deposition,
allowing to infer prospective zones for heavy minerals, which are considered important
industrial minerals in the world scenario. The study area is located on the south coast of
Rio Grande do Norte, between the counties of São José do Mipibu and Canguaretama.
The methodologies employed in the present work were: the Aeromagnetic and
Aeroradiometric Method and the Geochemical Method. The integration of these data,
together with the geological and geomorphological study of the area, allowed us to
analyze the distribution of placer deposits, restricting six minerals as the main study
tool, namely: cyanite, ilmenite, magnetite, monazite, rutile and zircon. Four subareas
(A, B, C and D) were separated according to the favorable environment for placer
formation, in order to verify if there is evidence of geophysical signatures related to the
mentioned minerals. Among these areas, only A and B could be visited in the field,
obtaining a satisfactory result by corroborating the selected geophysical anomalies.
Despite the scarcity of Brazilian research on the subject of placeres, the relevance of
this research is to spread the use of geophysical methods for the study of heavy
minerals, which, despite the limitations, showed efficient results in the prospecting and
exploration of the studied mineral deposit. |
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