Geofísica Rasa na Investigação Geológica-Geotécnica de Cavidades Naturais Subterrâneas na Mina de Ferro N4E, Carajás

Barbosa, Marcelo Roberto; Braga, Marco Antônio; Brandi, Iuri Viana; Paula, Rafael Guimarães de; Araujo, Ramon Nunes; Prosdocimi, Guilherme; Dias, Leonardo Santana de Oliveira

doi:10.1190/sbgf2017-129

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…As an example of applicability, Cardoso (2016) used shallow geophysical methods (electrical resistivity, magnetometry and radiometry) as a tool in the prospecting of caves in the Quadrilátero Ferrífero region. Barbosa et al (2016aBarbosa et al ( , 2016b, Barbosa et al (2017), Prosdocimi et al (2018) and Gama et al (2018 demonstrated important lithostructural aspects of iron caves through the integration of geophysical methods. Recently, Barbosa (2018) developed an electrical resistivity methodology for assessing iron cave stability.…”

Section: Introductionmentioning

confidence: 99%

Geoelectrical Signatures and their Relationships with the Lateritic Horizons: A Case Study of the N4EN Mine’s Iron Cave, Carajás Complex, Brazil

Prosdocimi¹,

Braga²,

Barbosa³

et al. 2019

Braz J Geophys

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The Brazilian speleological heritage is protected by laws, and every region where caves are present requires scientific studies to assist in environmental licensing. In the context of mining in iron formations, the near-surface geophysical studies using electroresistivity survey were performed in the cave N4E-0022, located at the N4EN iron mine, Carajás Complex, northern Brazil. The near-surface geophysical surveys generated continuous images that enhanced the lithostructural mapping of the lateritic profile, especially in places to which access by conventional methods was difficult. The electrical resistivity profiles were acquired with the dipole-dipole arrangement in the upper portion of the cave. Three sections were performed in SW-NE direction and two in SE-NW direction, totaling 435 meters of acquisition. The geoelectrical signatures were correlated with the lithologic logs of drillholes, the geophysical well logging and with the typical lateritic profile in the cave N4E-0022 surroundings. The results showed a satisfactory interpretation for the near-surface geoelectrical profiles and evolved to a comparison with the lateritic profile (lateritic crust, transition horizon, and saprolite horizon), providing inherent resistivity signatures for each modeled material.Keywords: applied geophysics, iron cave, Carajás.RESUMO O patrimônio espeleológico brasileiro é protegido por leis, e qualquer região com a presença de cavidades precisa de estudos científicos para auxiliar o licenciamento de empreendimentos. No contexto da mineração em terrenos ferríferos, estudos geofísicos rasos utilizando eletrorresistividade foram executados na cavidade N4E-0022, localizada no extremo norte da Mina de N4EN, Complexo Carajás. A geofísica rasa gerou imagens contínuas que potencializaram o mapeamento lito-estrutural do substrato rochoso, principalmente em locais de difícil acesso aos métodos convencionais. Os perfis de eletrorresistividade foram adquiridos com arranjo dipolo-dipolo na porção superior da cavidade. de modo paralelo entre si na porção superior da cavidade. Três seções foram executadas na direção SW-NE e duas na direção SE-NW, totalizando 435 metros de aquisição. As assinaturas geoelétricas das seções foram correlacionadas com as descrições litológicas de furos de sondagem, perfilagens geofísicas de furos de sonda e o mapeamento de detalhe do perfil laterítico no entorno da cavidade N4E-0022, evidenciando um resultado satisfatório para as interpretações realizadas. Os resultados evoluíram para uma comparação com o perfil de alteração típico de rochas ferruginosas (crosta laterítica, horizonte de transição e saprolito), e forneceram assinaturas de resistividades inerentes à cada material modelado. Palavras-chave: geofísica aplicada, caverna ferrífera, Carajás.

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Section: Introductionmentioning

confidence: 99%

Geoelectrical Signatures and their Relationships with the Lateritic Horizons: A Case Study of the N4EN Mine’s Iron Cave, Carajás Complex, Brazil

Prosdocimi¹,

Braga²,

Barbosa³

et al. 2019

Braz J Geophys

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“…More recent geophysical projects for iron caves are described in Barbosa et al (2016a, b), Barbosa et al (2017), Prosdocimi et al (2018) and Gama et al (2018), and show that near surface geophysics can detail relevant underground geostructural aspects, imperceptible to conventional mapping methods, especially in the portions between the caves ceilings and the surface of the terrain, identifying more precisely their real zones of fragility.…”

Section: Introductionmentioning

confidence: 99%

Speleological Geophysics - Methodology for the Application of Geophysics in Iron Cave Studies

Barbosa¹,

Braga²,

Gama³

et al. 2019

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

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“…In the present state of the art, Barbosa et al (2017) are reported to explore the use of Seismic Refraction, Ground Penetrating Radar, and Electrical Resistivity at geological and geotechnical investigations of a natural cave in the iron lithotypes at the Carajás, in Brasil. Regarding cave evolution in iron lithotypes, noted are Dutra (2013), Oliveira et al (2015) and Abreu et al (2016), besides others.…”

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Geophysical analysis of natural caves in iron lithotypes in the region of Mariana, Southeastern Quadrilátero Ferrífero, Brazil

et al. 2018

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Geofísica Rasa na Investigação Geológica-Geotécnica de Cavidades Naturais Subterrâneas na Mina de Ferro N4E, Carajás

Cited by 4 publications

References 5 publications

Geoelectrical Signatures and their Relationships with the Lateritic Horizons: A Case Study of the N4EN Mine’s Iron Cave, Carajás Complex, Brazil

Geoelectrical Signatures and their Relationships with the Lateritic Horizons: A Case Study of the N4EN Mine’s Iron Cave, Carajás Complex, Brazil

Speleological Geophysics - Methodology for the Application of Geophysics in Iron Cave Studies

Geophysical analysis of natural caves in iron lithotypes in the region of Mariana, Southeastern Quadrilátero Ferrífero, Brazil

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