VTEM and Aeromagnetic Data Modeling Applied to Cu, Zn and Pb Prospection in Palmeirópolis Project, TO, Brazil

Couto, Márcia Thereza; Wosniak, Ricardo; Marques, Eduardo Duarte; Duque, Tiago Rocha Faria; Carvalho, Marco Túlio Naves de

doi:10.1190/sbgf2017-104

Cited by 3 publications

(6 citation statements)

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“…The recovered dB/dt and conductivity model was reviewed and compared with the known geology and identified Cu, Zn and Pb ore bodies C1-C4 (Couto Jr., 2017) and local high-resolution inversions were performed with cell size in X = 10m and Y=50m for those polygons (Figure 5). For C1, C2 and C3 the targets have a strong agreement with the CPRM report (Figure 6) and with the previous modelling of the conductors using plates (Figure 7) while the C4 model shows a result compatible with the description of disseminated pyrrotite (Couto Jr. et al, 2017) and cannot be analyzed using the same parameters as the other identified orebodies (Figure 8). including the C1, C2 and C3 orebodies already studied (Figure 9).…”

Section: Resultsmentioning

confidence: 99%

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Inversion of Electromagnetic and Magnetic Data and Self-Organizing Maps applied to Palmeirópolis Project

Aisengart¹,

Barbosa²,

Plastow³

et al. 2019

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef

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Section: Resultsmentioning

confidence: 99%

“…and Votorantim Metais and executed by Microsurvey (Votorantim, 2008). The survey location is indicated in Figure 1 (Couto Jr. et al, 2017). The survey is E-W oriented, with flight-lines spaced by 250 m (tie lines in the N-S direction, spaced by 2500 m), 80 km/h speed acquisition and 58 m terrain clearance for the VTEM system.…”

Section: Introductionmentioning

confidence: 99%

Inversion of Electromagnetic and Magnetic Data and Self-Organizing Maps applied to Palmeirópolis Project

Aisengart¹,

Barbosa²,

Plastow³

et al. 2019

Proceedings of the 16th International Congress of the Brazilian Geophysical Society&Expogef

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“…Three sets of data were acquired in the same spatial positions due to the difficult access and crossing of the banks of the Vermelho River (Figure 3A). The SW-NE survey line was positioned perpendicularly to the main direction of the regional geological structures to reduce the effects of threedimensional structures that cannot be accurately modeled via 2D inversions, thus causing distortions in the electrical resistivity models [29,[42][43][44].…”

Section: Data Acquisitionmentioning

confidence: 99%

“…In Brazil, the records of VMS-type deposits are scarce [22][23][24][25][26][27][28][29], possibly due to the lack of detailed geological mapping and geophysical surveys in areas with geological potential for these deposits to occur.…”

Section: Introductionmentioning

confidence: 99%

Electrical Prospecting of Gold Mineralization in Exhalites of the Digo-Digo VMS Occurrence, Central Brazil

do Amaral,

Borges,

Toledo

et al. 2023

Minerals

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The greenstone belts of the Crixás-Goiás Domain are economically important due to significant epigenetic gold deposits and the potential for under-researched syngenetic deposits. The gold occurrences associated with the volcanogenic massive sulfide (VMS) deposits in the region are documented only in the volcanoclastic rocks of the Digo-Digo Formation, Serra de Santa Rita greenstone belt. The objective of this work is to discuss the efficiency of the induced polarization methods in the time and frequency domains for differentiating and identifying potentially mineralized zones in the exhalites associated with the VMS-type gold of the Digo-Digo Formation. Data were acquired using a multielectrode resistivity meter with the dipole–dipole array and 10 m spacing between electrodes, as well as different current injection times (250, 1000, and 2000 ms). After the electrical data processing and inversion, the sections were integrated into ternary red-green-blue and cyan-magenta-yellow models to highlight areas of high chargeability, low resistivity, and high metal factor (frequency domain) and, thus, map the higher potential zones to host polarizable metallic minerals. The geological–geophysical model elaborated from the correlation of electrical and surface geological data allowed us to identify four anomalous areas related to potential mineralized zones. The geological data confirm that two targets are associated with the geological contacts between metamafic and intermediate metavolcanic units and the exhalative horizon. One of the targets coincides with a sulfide-rich exhalative horizon (VMS), while the last target occurs in the occurrence area of metaultramafic rocks, where gold mineralization occurrences have not been previously described, being a promising target for future investigations.

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“…The TEM method or Time Domain Electromagnetic (TDEM) method is an inductive electromagnetic (EM) method used to map the electrical conductivity (or resistivity) contrast in subsurface. The method is quite versatile and finds applications in the mineral exploration (Oliveira, 2014;Couto et al, 2016;Viezzoli et al, 2016;Couto et al, 2017b;Oliveira, 2020), hydrogeology investigation (Danielsen, et al, 2002;Porsani et al, 2012aPorsani et al, , 2012bBortolozo et al, 2014;Bortolozo et al, 2015;Almeida, et al, 2017;Campaña, et al, 2017;Hamada, et al, 2018;Leite, et al, 2018;Rangel, et al, 2018).The TEM methodology was developed in face of the difficulties in the applications of the Frequency Domain Electromagnetic (FDEM) method, which the induction of the EM field in subsurface (secondary field) is generated through an alternate current (AC) within a transmitter loop (Tx) on surface and the secondary field is measured through a receiver coil (Rx) still in the presence of the primary field generated by the current in Tx (Figure 3. 1-a).…”

Section: Transient Electromagnetic Methods (Tem)mentioning

confidence: 99%

Investigação de Depósitos Auríferos no Quadrilátero Ferrífero, MG, Por Meio da Análise de Dados HTEM

Júnior¹,

Antônio²

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que sempre me apoiaram em todas as minhas iniciativas e esta é mais uma delas.Sobretudo naqueles momentos de sacrifício pessoal necessários para atingirmos nossos objetivos.Agradeço enormemente ao meu orientador Prof. Jorge Luís Porsani por acreditar no meu potencial e incentivar meu embarque no doutorado, além de sempre ter uma palavra amiga, mas realista, quando necessária.Agradeço ao Instituto de Astronomia, Geofísica e Ciências Atmosféricas, seus corpos docente e discente, além do competente quadro de funcionários, por todo o apoio que recebi ao longo da minha trajetória acadêmica que me trouxe até aqui.Agradeço ao Serviço Geológico do Brasil -CPRM por me disponibilizar um período de 2 anos de licença para que pudesse me dedicar integralmente ao meu projeto de doutorado. Um agradecimento especial aos amigos Paulo Henrique Amorim Dias e Joanna Chaves Souto Araújo, por sempre me resgatarem na geologia do Quadrilátero Ferrífero, e a Raphael Ribeiro Severino, pela discussão sobre o MVI. Agradeço ao meu chefe direto, diretor do Centro de Geociências Aplicadas do SGB-CPRM, Noevaldo Araújo Teixeira, por me incentivar e ceder o espaço e tempo necessário para o término da tese.I would like to strongly thank my co-advisor, Esben Auken, for accepting me in the Hydrogeophysics Group for the period of one year in Aarhus during 2018. I am also very thankful to Professors Gianluca Fiandaca and Anders Vest Christiansen, for the great insights about IP effect and TEM method, and for the interest to collaborate in this research. I also thank my colleagues in Aarhus, especially my friends Pradip Maurya, for helping me with Workbench and Lichao Liu, for sharing the office during my period in Aarhus. Also, off course, for grabbing some beers and eat something together at late in the night after a hard day of work.Agradeço à CAPES, pela bolsa de 6 meses para o período sanduíche em Aarhus (processo 88881.188567/2018-01). Agradeço a todos que de forma direta ou indireta me ajudaram no desenvolvimento desta tese. Muito obrigado! ResumoO efeito de IP aéreo (AIP) tem sido tema de grande interesse na comunidade geocientífica internacional, com evidências cada vez maiores sobre sua importância para definir melhor os modelos de resistividade elétrica em levantamentos eletromagnéticos aéreos no domínio do tempo. Suas implicações são significativas no mapeamento geológico e na exploração mineral, em particular, mineralizações em sulfetos metálicos.No entanto, no Brasil, estudos sobre este tema são escassos ou praticamente inexistentes.Nesta pesquisa, abordou-se a aplicação do AIP em dados eletromagnéticos no domínio do tempo voados por helicóptero (Helicopter Transient Electromagnetic -HTEM) sob o Greenstone Belt Rio das Velhas, na região do Quadrilátero Ferrífero (QF), MG. O trabalho focou na modelagem dos dados HTEM considerando-se o efeito AIP e sua potencialidade em identificar zonas favoráveis às mineralizações auríferas. Para isso, utilizou-se um método inovador de reparametrização do modelo de Cole-Cole, denominado ângulo de fase máx...

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VTEM and Aeromagnetic Data Modeling Applied to Cu, Zn and Pb Prospection in Palmeirópolis Project, TO, Brazil

Cited by 3 publications

References 1 publication

Inversion of Electromagnetic and Magnetic Data and Self-Organizing Maps applied to Palmeirópolis Project

Inversion of Electromagnetic and Magnetic Data and Self-Organizing Maps applied to Palmeirópolis Project

Electrical Prospecting of Gold Mineralization in Exhalites of the Digo-Digo VMS Occurrence, Central Brazil

Investigação de Depósitos Auríferos no Quadrilátero Ferrífero, MG, Por Meio da Análise de Dados HTEM

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