Sensoriamento remoto aplicado no estudo de estruturas geologicas com ocorrencias de depositos minerais, na porcao centro-norte do estado da Paraiba / Application of remote sensing to the study of geologic structures with the occurrence of deposits in the central-north part of Paraiba state

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

The Paraíba State includes part of the Borborema Pegmatitic Province. The Seridó Group occurs in this Province and has economic importance as host of several metallic (sheelite, beryl, cassiterite and tantalite) and non-metallic (barite, limestone, kaolinite and fluorite) deposits. This work aims to identify structural geologic patterns that may be associated with mineral deposits. Potencially mineralized areas in the northern central part of the Paraíba State, using remote sensing and Geographic Information System techniques. Analog Landsat-5/TM data were used to identify linear features in the terrain that represent lineaments. Digital images processing techniques such as contrast enhancement, filtering, principal component transformation and IHS transformation were used on the SPRING and ENVI softwares to complement the visual interpretation. The results obtained show that the linear contrast stretching and filtering are useful tools to identify lineaments in optical remote sensing imagery. The analysis of the maps of lineaments, fractures and lithology as well as the Landsat-5/TM imagery interpretation with the mineral deposits data, led to the identification structural patterns. The directions N30°- 60°E, N30°-50°W and N60°-80°W were recognized as the main favorable directions for mineral deposits formation.

ASSUNTO(S)

estrutura geologica geologia depositos minerais mapeador tematico (landsat 5) paraiba (estado) spring rochas igneas rochas metaforicas envi

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