Interpretação das anomalias de potássio hidrotermal e parâmetro F da região do Complexo Bossoroca, São Sepé, RS

Soares, Márcio de Souza; Koppe, Jair Carlos; Costa, João Felipe Coimbra Leite; Rolim, Silvia Beatriz Alves

doi:10.1590/s0370-44672004000100008

Cited by 9 publications

(6 citation statements)

References 3 publications

(3 reference statements)

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“…The geophysical factor is relevant in the process of mineral exploration, since certain geophysical techniques, such as gamma spectrometry, allow to delimit the hydrothermal alteration zones associated to mineral deposits (IRVINE & SMITH 1990, SOARES et al 2004. Gamma spectrometry have high concentration of this element in relation to other rocks.…”

Section: Comparison With Geophysical Datamentioning

confidence: 99%

Favorability mapping of hydrotermal vein-type lead deposits: a case study in Ribeira Valley, Brazil

Viltus

Bonfim

2018

Rev. Inst. Geol.

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The region of the Ribeira Valley is known for its metallic sulphide deposits (lead, zinc, copper, silver and gold), being the major lead producer of the Brazil in the 1950s. Since then, it has become the target of several geological studies from which two models of lead and zinc mineralization known as Perau and Panelas models were proposed. This study is particularly interested in the Panelas model, which is characterized by its vein morphology, association with carbonate rocks and structural control. Based on literature, this paper proposes to verify the applicability of the hierarchical analysis process (AHP) as auxiliary of the geographic information system (GIS) in the favorability mapping of hydrothermal veins-type Pb deposits which fit in the Panelas model. The study area is the western region of the Ribeira Valley, located in the southern portion of the São Paulo State, Brazil. In order to perform this work, four parameters were used: geological structure, stratigraphy, lithology and geochemistry. The result obtained highlights areas corresponding to Mina de Furnas, Bairro da Serra and Água Clara Formations as highly favorable areas to lead mineralization according this model. In addition, it shows the negative association of these geological formations with potassium concentration.

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Section: Comparison With Geophysical Datamentioning

confidence: 99%

Favorability mapping of hydrotermal vein-type lead deposits: a case study in Ribeira Valley, Brazil

Viltus

Bonfim

2018

Rev. Inst. Geol.

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“…• imagens aerogeofísicas: as imagens da razão K/eTh e do parâmetro F permitem o reconhecimento de enriquecimento de K (Biondi et al, 2001;Quadros et al, 2003;Soares et al, 2004), e este radioelemento pode associar-se com alteração hidrotermal, conforme observado em muitos dos prospectos abordados, caracterizados por alterações como sericitização e feldspatização. A partir das imagens individuais de K/eTh e parâmetro F (Fig.…”

Section: Mapas Prospectivos Geradosunclassified

Lógica FUZZY e técnica sam para modelagem previsional do ouro no setor oeste da província mineral do tapajós usando dados aerogeofísicos e de sensoriamento remoto

et al. 2011

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ABSTRACT. Tapajós Mineral Province (TMP), the largest Brazilian gold province, lies in the south-central part of the Amazonian Craton. TMP is characterized by paleoproterozoic lithostratigraphic units that host gold mineralization of the same age. Based on this mineral potential, this paper used the processing and spatial modeling of regional airborne geophysical data (survey Block I -Tapajós Gold Province) and of remote sensing data (SAR-R99B and TM/Landsat 5) available to produce maps on gold favorability in the west portion of the TMP. Therefore, images of the K/eTh ratio and F parameter were produced aiming to enhance K enrichment.Lineament buffer image, interpreted using magnetometric images, SAR-R99B data and TM sensor, was produced in order to interpret relevant structural components.Using these products and the regional geological map available at PROMIN-Tapajós project, the fuzzy logic technique and the Spectral Angle Mapper classification were used to produce predictive maps of gold potential. Gold occurrences currently mapped were used to validate the results followed by a discussion on the performance of the production of regional predictive maps in areas with poor geological knowledge.Keywords: gold mineralizations, airborne geophysics, remote sensing, fuzzy logic, Spectral Angle Mapper, predictive maps. RESUMO.A Província Mineral do Tapajós (PMT) compreende a maior província aurífera do Brasil e localiza-se na parte centro-sul do Cráton Amazônico. A PMTé caracterizada por unidades litoestratigráficas paleoproterozoicas que hospedam mineralizações auríferas de mesma idade. Com base neste potencial mineral, este artigo objetivou o processamento e a modelagem espacial de dados aerogeofísicos regionais (levantamento Bloco I -Província Aurífera do Tapajós) e de sensoriamento remoto (SAR-R99B e TM/Landsat 5) disponíveis para a geração de mapas de favorabilidade aurífera do setor oeste da PMT. Para tal, imagens da razão K/eTh e do parâmetro F foram produzidas no intuito de se realçar o enriquecimento de K. Imagem de buffers de lineamentos, interpretados através de imagens magnetométricas, SAR-R99B e do sensor TM, foi gerada para a interpretação de componentes estruturais relevantes. Empregando-se estes produtos, além do mapa geológico regional disponibilizado no projeto PROMIN-Tapajós, foi utilizada a técnica lógica fuzzy e o classificador Spectral Angle Mapper objetivando a produção de mapas previsionais de ouro.Ocorrências de ouro atualmente conhecidas foram usadas para a validação dos resultados e uma discussão sobre o desempenho da geração de mapas previsionais regionais em terrenos com baixo conhecimento geológico foi realizada.Palavras-chave: mineralizações auríferas, aerogeofísica, sensoriamento remoto, lógica fuzzy , Spectral Angle Mapper , mapas previsionais.

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“…Studies that aim at regional targets or structures with mining potential are based upon airborne survey or in products of remote sensors (Maas et al, 2003;Pascholati et al, 2003;Soares et al, 2004;Carvalho et al, 2006;Menezes et al, 2006). Works on mineral research in detail of localized targets by means of terrestrial geophysics research are relatively scarce (Mantovani et al, 2008;Moreira et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Geoelectric Modeling of Supergenic Manganese Ocurrence in Heliodora Region, Southern Minas Gerais

Moreira¹,

Reis²,

Filho³

et al. 2016

Rev. Bras. Geof.

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ABSTRACT. This paper discusses the results of the combined application of Electric resistivity and Induced Polarization methods into a mineral occurrence of manganese of supergenic origin, characterized by oxides of manganese and iron with terrain to powdery texture, arising from weathering of spessartite contained in metasediments.Keywords: mineral exploration, oxide, resistivity, chargeability, 3D modeling. RESUMO. Este trabalho discute os resultados de uso combinado dos métodos da Eletrorresistividade e Polarização Induzida numa ocorrência mineral de manganês de origem supergênica, caracterizada por óxidos de...Palavras-chave: exploração mineral, óxido, resistividade, cargabilidade, modelamento 3D.

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Interpretação das anomalias de potássio hidrotermal e parâmetro F da região do Complexo Bossoroca, São Sepé, RS

Cited by 9 publications

References 3 publications

Favorability mapping of hydrotermal vein-type lead deposits: a case study in Ribeira Valley, Brazil

Favorability mapping of hydrotermal vein-type lead deposits: a case study in Ribeira Valley, Brazil

Lógica FUZZY e técnica sam para modelagem previsional do ouro no setor oeste da província mineral do tapajós usando dados aerogeofísicos e de sensoriamento remoto

Geoelectric Modeling of Supergenic Manganese Ocurrence in Heliodora Region, Southern Minas Gerais

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