Contribuição ao conhecimento geologico-metalogenetico associado aos granitoides intrusivos no grupo Brusque (SC) combase em informações geologicas, aerogamaespectrometricas e LANDSAT/TM-5

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

This work seeks to contribute for the geologic-metallogenetic knowledge of the intrusive granitoids of the Brusque Group (GIGB), Santa Catarina State. Available geologic information were used in conjunction with petrographic and geochemical information and with aerogeophysical and remote sensing data. Geologic information indicated the GIGB are polarized between a northem and a southem domains in the study region. In the southem domain, grey/white biotite-muscovite granitoids were generated under crustal influence from reduced magmas. In this domain occurrences of Sn, Mo and W are found. The occurrence of gneisses and migmatites associated to the granitoids of this domain, as well as their characterization as transitional between types I, S and A, indicates their evoluted character. The occurrence of K-feldspar homblende granitoids are characteristic of the northern domain, representing more oxidizing conditions, as well as Au and W occurrences. A possible source for the rocks of the northern domain are the granulitic gneisses of the Luis Alves Craton, located to the north. Aerogammaespectrometry data, transformed into grids and processed as digital images, contributed for detailing the geology of the study region. These data showed a strong noise and it was necessary to apply pre-processing techniques to minimize the problem, making it possible to interpret the data in relation to the known geology. LANDSA T/TM-5 data were used for structural interpretation, providing important information about the structural elements of the area, such as fractures, faults and mineralized veins. Correlation between these structures and the directions obtained from lineament maps showed the importance of using remote sensing imagery in the study region

ASSUNTO(S)

fotografia aerea em geologia metalogenia granito

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