Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT)
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/s00024-020-02444-w http://hdl.handle.net/11449/200087 |
Resumo: | Mottled and high-alumina clay horizons (Gleysols) above dismantled iron crusts (Ferralsols) are widespread in the soils that developed on the flat sedimentary plateau located in western Minas Gerais State (Brazil). Field exploration shows that the deposits of high-alumina clays are located at a lower topographic position, mottled horizons suggesting a lateral transformation system. Two-dimensional and pseudo-three-dimensional electrical resistivity tomography (ERT) techniques have been tested to investigate the distribution of high-alumina clay layers in a thick lateritic mantle, and to assess the potential of the technique to delimitate ore reserves. The figures of resistivity, based on spatial variations of electrical properties of the weathering layers, showed spatial changes in the subsurface structure of weathering mantle, expanding the distribution of iron crust and the high-alumina clay layers, which are strongly influenced by aquifer. Combining 2D and pseudo-3D geophysical images with soil morphology and geochemistry, we delimitate the high-alumina clay layer and discuss its genesis. The ore is located exclusively on the edge of the plateau and is closely linked to the development of hydromorphic soils, exactly where the vertical water flow is restrained by the iron crust. This distinct water regime defines the geochemical transfers in soil mantle, depleting Fe2O3 from Gleysol and correspondingly increasing Al2O3 and SiO2. This study aimed to evaluate the potential of ERT as a prospecting tool for supergene ore, and as a technique with reduced environmental impact in the mineral research, when compared to the pre-existing exploration methods (trenches, drill holes and extraction) that are applied on this sensitive wetland system in which high-alumina clays may occur. |
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Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT)ferralsolsgleysolshydromorphic soilssedimentary plateauWetlandsMottled and high-alumina clay horizons (Gleysols) above dismantled iron crusts (Ferralsols) are widespread in the soils that developed on the flat sedimentary plateau located in western Minas Gerais State (Brazil). Field exploration shows that the deposits of high-alumina clays are located at a lower topographic position, mottled horizons suggesting a lateral transformation system. Two-dimensional and pseudo-three-dimensional electrical resistivity tomography (ERT) techniques have been tested to investigate the distribution of high-alumina clay layers in a thick lateritic mantle, and to assess the potential of the technique to delimitate ore reserves. The figures of resistivity, based on spatial variations of electrical properties of the weathering layers, showed spatial changes in the subsurface structure of weathering mantle, expanding the distribution of iron crust and the high-alumina clay layers, which are strongly influenced by aquifer. Combining 2D and pseudo-3D geophysical images with soil morphology and geochemistry, we delimitate the high-alumina clay layer and discuss its genesis. The ore is located exclusively on the edge of the plateau and is closely linked to the development of hydromorphic soils, exactly where the vertical water flow is restrained by the iron crust. This distinct water regime defines the geochemical transfers in soil mantle, depleting Fe2O3 from Gleysol and correspondingly increasing Al2O3 and SiO2. This study aimed to evaluate the potential of ERT as a prospecting tool for supergene ore, and as a technique with reduced environmental impact in the mineral research, when compared to the pre-existing exploration methods (trenches, drill holes and extraction) that are applied on this sensitive wetland system in which high-alumina clays may occur.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Departamento de Petrologia e Metalogenia (DPM) Universidade Estadual Paulista (UNESP), Av. 24A, 1515, Bela Vista, CP: 178Departamento de Geologia Aplicada (DGA) Universidade Estadual Paulista (UNESP), Av. 24A, 1515, Bela VistaInstituto de Estudos Sócio-Ambiental (IESA) Universidade Federal Goiás (UFG)Centro de Estudos Ambientais (CEA) Universidade Estadual Paulista (UNESP), Av. 24A, 1515, Bela VistaDepartamento de Petrologia e Metalogenia (DPM) Universidade Estadual Paulista (UNESP), Av. 24A, 1515, Bela Vista, CP: 178Departamento de Geologia Aplicada (DGA) Universidade Estadual Paulista (UNESP), Av. 24A, 1515, Bela VistaCentro de Estudos Ambientais (CEA) Universidade Estadual Paulista (UNESP), Av. 24A, 1515, Bela VistaFAPESP: 2014/01131-4Universidade Estadual Paulista (Unesp)Universidade Federal Goiás (UFG)Coelho, C. V.S. [UNESP]Moreira, C. A. [UNESP]Rosolen, V. [UNESP]Bueno, G. T.Salles, J.Furlan, L. M. [UNESP]Govone, J. S. [UNESP]2020-12-12T01:57:20Z2020-12-12T01:57:20Z2020-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article3943-3960http://dx.doi.org/10.1007/s00024-020-02444-wPure and Applied Geophysics, v. 177, n. 8, p. 3943-3960, 2020.1420-91360033-4553http://hdl.handle.net/11449/20008710.1007/s00024-020-02444-w2-s2.0-8507973629690868573123910800000-0002-6949-6679Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPure and Applied Geophysicsinfo:eu-repo/semantics/openAccess2021-10-23T11:59:56Zoai:repositorio.unesp.br:11449/200087Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T11:59:56Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT) |
title |
Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT) |
spellingShingle |
Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT) Coelho, C. V.S. [UNESP] ferralsols gleysols hydromorphic soils sedimentary plateau Wetlands |
title_short |
Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT) |
title_full |
Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT) |
title_fullStr |
Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT) |
title_full_unstemmed |
Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT) |
title_sort |
Analyzing the Spatial Occurrence of High-Alumina Clays (Brazil) Using Electrical Resistivity Tomography (ERT) |
author |
Coelho, C. V.S. [UNESP] |
author_facet |
Coelho, C. V.S. [UNESP] Moreira, C. A. [UNESP] Rosolen, V. [UNESP] Bueno, G. T. Salles, J. Furlan, L. M. [UNESP] Govone, J. S. [UNESP] |
author_role |
author |
author2 |
Moreira, C. A. [UNESP] Rosolen, V. [UNESP] Bueno, G. T. Salles, J. Furlan, L. M. [UNESP] Govone, J. S. [UNESP] |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Federal Goiás (UFG) |
dc.contributor.author.fl_str_mv |
Coelho, C. V.S. [UNESP] Moreira, C. A. [UNESP] Rosolen, V. [UNESP] Bueno, G. T. Salles, J. Furlan, L. M. [UNESP] Govone, J. S. [UNESP] |
dc.subject.por.fl_str_mv |
ferralsols gleysols hydromorphic soils sedimentary plateau Wetlands |
topic |
ferralsols gleysols hydromorphic soils sedimentary plateau Wetlands |
description |
Mottled and high-alumina clay horizons (Gleysols) above dismantled iron crusts (Ferralsols) are widespread in the soils that developed on the flat sedimentary plateau located in western Minas Gerais State (Brazil). Field exploration shows that the deposits of high-alumina clays are located at a lower topographic position, mottled horizons suggesting a lateral transformation system. Two-dimensional and pseudo-three-dimensional electrical resistivity tomography (ERT) techniques have been tested to investigate the distribution of high-alumina clay layers in a thick lateritic mantle, and to assess the potential of the technique to delimitate ore reserves. The figures of resistivity, based on spatial variations of electrical properties of the weathering layers, showed spatial changes in the subsurface structure of weathering mantle, expanding the distribution of iron crust and the high-alumina clay layers, which are strongly influenced by aquifer. Combining 2D and pseudo-3D geophysical images with soil morphology and geochemistry, we delimitate the high-alumina clay layer and discuss its genesis. The ore is located exclusively on the edge of the plateau and is closely linked to the development of hydromorphic soils, exactly where the vertical water flow is restrained by the iron crust. This distinct water regime defines the geochemical transfers in soil mantle, depleting Fe2O3 from Gleysol and correspondingly increasing Al2O3 and SiO2. This study aimed to evaluate the potential of ERT as a prospecting tool for supergene ore, and as a technique with reduced environmental impact in the mineral research, when compared to the pre-existing exploration methods (trenches, drill holes and extraction) that are applied on this sensitive wetland system in which high-alumina clays may occur. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T01:57:20Z 2020-12-12T01:57:20Z 2020-08-01 |
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/s00024-020-02444-w Pure and Applied Geophysics, v. 177, n. 8, p. 3943-3960, 2020. 1420-9136 0033-4553 http://hdl.handle.net/11449/200087 10.1007/s00024-020-02444-w 2-s2.0-85079736296 9086857312391080 0000-0002-6949-6679 |
url |
http://dx.doi.org/10.1007/s00024-020-02444-w http://hdl.handle.net/11449/200087 |
identifier_str_mv |
Pure and Applied Geophysics, v. 177, n. 8, p. 3943-3960, 2020. 1420-9136 0033-4553 10.1007/s00024-020-02444-w 2-s2.0-85079736296 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.format.none.fl_str_mv |
3943-3960 |
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 |
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1803046318188265472 |