Processamento digital de imagens LANDSAT/TM e GEOSCAN/AMSS na caracterização lito-estrutural e delimitação de alteração hidrotermal na area do deposito aurifero de Riacho dos Machados (MG)

AUTOR(ES)
DATA DE PUBLICAÇÃO

1994

RESUMO

This work presents the results gf digital image processing techniques applied to LANDSATffM and GEOSCAN/AMSS in the region of the Riacho dos fV1achados Gold Deposit, in the northwest of Minas Gerais State. The main objective was to evaluate the performance of these techniques for characterizing lithologic and structural controls and hydrothermal alteration zones associated with gold mineralization.The application of selected techniques to LANDSA TffM allowed discrimination of the main lithologic unities, as defined by ECOGEO (1991), and also the main superficial occurrences of mineraIs related to hydrothermal alteration. Enhancement of structural information, however, did not add new information to the existing geologic map. Spectrometry and X-ray difIraction studies in samples collected in the study area allowed the characterization of difIerent pattems for the mineralized and host rocks, with goethite/sericite/muscovite being associated with the mineralized zone and hematite/kaolinite associated with host rocks. Processed GEOSCAN/AMSS images allowed the identification of hydrothermal alteration minerals at the surface, showing that remote sensing imagery with greater spatial and spectral resolutions may be useful for identifying areas with greater potential for more detailed exploration activities

ASSUNTO(S)

processamento de imagens - tecnicas digitais sensoriamento remoto

ACESSO AO ARTIGO

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