Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazil
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s00024-020-02559-0 http://hdl.handle.net/11449/200886 |
Resumo: | This work investigates the occurrence of gold on meta-ultramafic rocks at Funcho Farm, São Sepé, Rio Grande do Sul state, southernmost Brazil. The presence of base metals in meta-ultramafic rocks whose origin is related to volcanic massive sulfide (VMS) deposits has only rarely been explored in the scientific literature. The gold was identified in geochemical prospecting of current sediments in previous works, and suggested that the host rock of the mineralization is the serpentinite of Funcho Farm. The methodology used to achieve the study objectives included geological field surveys, surveys of structural measurements and acquisition of geophysical data utilizing electrical resistivity (DC) and induced polarization (IP) methods, using electrical tomography, with the execution of dipole–dipole arrays. In this study, nine electrical tomography lines, each 400 m, were acquired. The data were processed in 2D electrical inversion and then interpolated for 3D visualization. The information acquired for interpretations during field studies revealed that the probable mineralization is hosted in structures such as fractures and hinges and is also associated with milky quartz veins. The data analysis allowed the 3D delimitation of possible deep sulfide mineralizations from hydrothermal fluids, probably from the intrusion of the São Sepé granite. The results presented in this work are very useful, because they can serve as an appropriate analogy of geological reality associated with a reliable deposit architecture, helping to outline a strategy for a future drilling campaign directed to the targets found. |
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Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazilchargeabilityelectrical tomographygoldmeta-ultramaficMineral researchresistivityThis work investigates the occurrence of gold on meta-ultramafic rocks at Funcho Farm, São Sepé, Rio Grande do Sul state, southernmost Brazil. The presence of base metals in meta-ultramafic rocks whose origin is related to volcanic massive sulfide (VMS) deposits has only rarely been explored in the scientific literature. The gold was identified in geochemical prospecting of current sediments in previous works, and suggested that the host rock of the mineralization is the serpentinite of Funcho Farm. The methodology used to achieve the study objectives included geological field surveys, surveys of structural measurements and acquisition of geophysical data utilizing electrical resistivity (DC) and induced polarization (IP) methods, using electrical tomography, with the execution of dipole–dipole arrays. In this study, nine electrical tomography lines, each 400 m, were acquired. The data were processed in 2D electrical inversion and then interpolated for 3D visualization. The information acquired for interpretations during field studies revealed that the probable mineralization is hosted in structures such as fractures and hinges and is also associated with milky quartz veins. The data analysis allowed the 3D delimitation of possible deep sulfide mineralizations from hydrothermal fluids, probably from the intrusion of the São Sepé granite. The results presented in this work are very useful, because they can serve as an appropriate analogy of geological reality associated with a reliable deposit architecture, helping to outline a strategy for a future drilling campaign directed to the targets found.Universidade Estadual Paulista UNESP/Rio Claro Campus, Avenida 24-A, 1515-Bela Vista, PO Box 178. 13506-900Department of Geology DGA Universidade Estadual Paulista UNESP/Rio Claro Campus, Avenida 24-A, 1515-Bela Vista, PO Box 178Universidade Estadual Paulista UNESP/Rio Claro Campus, Avenida 24-A, 1515-Bela Vista, PO Box 178. 13506-900Department of Geology DGA Universidade Estadual Paulista UNESP/Rio Claro Campus, Avenida 24-A, 1515-Bela Vista, PO Box 178Universidade Estadual Paulista (Unesp)Lenhare, Bruno Daniel [UNESP]Moreira, César Augusto [UNESP]2020-12-12T02:18:41Z2020-12-12T02:18:41Z2020-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1007/s00024-020-02559-0Pure and Applied Geophysics.1420-91360033-4553http://hdl.handle.net/11449/20088610.1007/s00024-020-02559-02-s2.0-8508929410990868573123910800000-0002-6949-6679Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPure and Applied Geophysicsinfo:eu-repo/semantics/openAccess2021-10-23T12:19:07Zoai:repositorio.unesp.br:11449/200886Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:38:11.348396Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazil |
title |
Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazil |
spellingShingle |
Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazil Lenhare, Bruno Daniel [UNESP] chargeability electrical tomography gold meta-ultramafic Mineral research resistivity |
title_short |
Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazil |
title_full |
Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazil |
title_fullStr |
Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazil |
title_full_unstemmed |
Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazil |
title_sort |
Geophysical Prospecting Over a Meta-Ultramafic Sequence with Indicators of Gold Mineralization in Rio Grande do Sul State, Southernmost Brazil |
author |
Lenhare, Bruno Daniel [UNESP] |
author_facet |
Lenhare, Bruno Daniel [UNESP] Moreira, César Augusto [UNESP] |
author_role |
author |
author2 |
Moreira, César Augusto [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Lenhare, Bruno Daniel [UNESP] Moreira, César Augusto [UNESP] |
dc.subject.por.fl_str_mv |
chargeability electrical tomography gold meta-ultramafic Mineral research resistivity |
topic |
chargeability electrical tomography gold meta-ultramafic Mineral research resistivity |
description |
This work investigates the occurrence of gold on meta-ultramafic rocks at Funcho Farm, São Sepé, Rio Grande do Sul state, southernmost Brazil. The presence of base metals in meta-ultramafic rocks whose origin is related to volcanic massive sulfide (VMS) deposits has only rarely been explored in the scientific literature. The gold was identified in geochemical prospecting of current sediments in previous works, and suggested that the host rock of the mineralization is the serpentinite of Funcho Farm. The methodology used to achieve the study objectives included geological field surveys, surveys of structural measurements and acquisition of geophysical data utilizing electrical resistivity (DC) and induced polarization (IP) methods, using electrical tomography, with the execution of dipole–dipole arrays. In this study, nine electrical tomography lines, each 400 m, were acquired. The data were processed in 2D electrical inversion and then interpolated for 3D visualization. The information acquired for interpretations during field studies revealed that the probable mineralization is hosted in structures such as fractures and hinges and is also associated with milky quartz veins. The data analysis allowed the 3D delimitation of possible deep sulfide mineralizations from hydrothermal fluids, probably from the intrusion of the São Sepé granite. The results presented in this work are very useful, because they can serve as an appropriate analogy of geological reality associated with a reliable deposit architecture, helping to outline a strategy for a future drilling campaign directed to the targets found. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T02:18:41Z 2020-12-12T02:18:41Z 2020-01-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1007/s00024-020-02559-0 Pure and Applied Geophysics. 1420-9136 0033-4553 http://hdl.handle.net/11449/200886 10.1007/s00024-020-02559-0 2-s2.0-85089294109 9086857312391080 0000-0002-6949-6679 |
url |
http://dx.doi.org/10.1007/s00024-020-02559-0 http://hdl.handle.net/11449/200886 |
identifier_str_mv |
Pure and Applied Geophysics. 1420-9136 0033-4553 10.1007/s00024-020-02559-0 2-s2.0-85089294109 9086857312391080 0000-0002-6949-6679 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Pure and Applied Geophysics |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129538881748992 |