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ABSTRACT. The northeastern portion of Santa Catarina State, southern Brazil, bears important primary gold mineralization associated with granitic intrusions with potassic and phyllic hydrothermal alteration zones and a phase shear zone reactivation. Airborne radiometric and magnetic data were applied in the study area through the use of gamma-ray spectrometry (Total Count, K, eTh and eU) and suggestive parameters of hydrothermal alteration as Kd, Ud and F, in association with geological units, while magnetometry (RTP, THDR, TDR and Signum Transform) was applied in the definition of the structural framework. Geophysical data was interpreted and integrated to geological information, such as lithologic units, structures, shear zones and gold mineralization, using the knowledge driven and index overlay methods in order to define favorable targets. The geophysical and geological data exhibit good correlation, as seen in the gamma-ray spectrometric domains and magnetic lineaments, and the favorability map shows important target areas for primary gold mineralization. It was possible to observe in the geophysical maps that shear zones and faults have more influence in the occurrences than potassic and phyllic hydrothermal alteration related to granitic intrusions. Keywords: geophysical exploration, knowledge-driven, Dom Feliciano Belt. RESUMO. A porcao nordeste do estado de Santa Catarina, sul do Brasil, possui importantes mineralizacoes auriferas primarias associadas a intrusoes graniticas com zonas de alteracao hidrotermal potassica e filica e posterior fase de reativacao de zonas de cisalhamento. Dados radiometricos e magneticos aerogeofisicos foram aplicados na area de estudo atraves do uso de gamaespectrometria (Contagem Total, K, eTh e eU) e parâmetros sugestivos de alteracao hidrotermal como Kd, Ud e Parâmetro F. Em associacao com unidades geologicas, enquanto a magnetometria (RTP, GHT, ISA e Signum Transform) foi aplicada na definicao do arcabouco estrutural. Os dados geofisicos foram interpretados e integrados as informacoes geologicas, como unidades litologicas, estruturas, zonas de cisalhamento e mineralizacoes de ouro, utilizando os metodos knowledge-driven e index overlay para definir alvos favoraveis. Os dados geofisicos e geologicos apresentam boa correlacao, como visto nos dominios espectrometricos de raios gama e lineamentos magneticos, e o mapa de favorabilidade mostra areas-alvo importantes para a mineralizacao de ouro primaria. Foi possivel observar nos mapas geofisicos que as zonas de cisalhamento e as falhas tem mais influencia nas ocorrencias do que as zonas de alteracao hidrotermal potassica e filica relacionada as intrusoes graniticas. Palavras-chave: exploracao geofisica, knowledge-driven, Cinturao Dom Feliciano.

brazilian journal of geophysics

RECOGNITION OF GOLD MINERALIZATION FAVORABILITY ZONES THROUGH AIRBORNE GAMMA-RAY SPECTROMETRY AND MAGNETOMETRY IN BRUSQUE AND BOTUVERÃ REGION, SOUTHERN BRAZIL

RECOGNITION OF GOLD MINERALIZATION FAVORABILITY ZONES THROUGH AIRBORNE GAMMA-RAY SPECTROMETRY AND MAGNETOMETRY IN BRUSQUE AND BOTUVERÃ REGION, SOUTHERN BRAZIL

RECOGNITION OF GOLD MINERALIZATION FAVORABILITY ZONES THROUGH AIRBORNE GAMMA-RAY SPECTROMETRY AND MAGNETOMETRY IN BRUSQUE AND BOTUVERÃ REGION, SOUTHERN BRAZIL