The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazil
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Brazilian Journal of Geology |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892021000300308 |
Resumo: | Abstract The Santa Fé Ni laterite deposit (Brazil) developed as a consequence of weathering of serpentinized dunites that produced a regolith in which the main Ni ore zone is a ferruginous saprolite with chlorite as the main ore-carrier along with Ni-bearing Fe-oxyhydroxides. The genesis of chlorite is related to hydrothermal alteration of spinel. This study found that part of the chlorite has a supergene origin. XRPD-Rietveld method and EMPA/SEM analyses coupled with geochemical and mass balance calculations have provided further information about the chemistry and mineralogy of the main ore minerals. An attempt is made to explain the mode of formation of secondary chlorite and associated ore minerals. The main Ni-bearing minerals in the green saprolite are serpentine and minor chlorite. In the ferruginous and ochreous saprolites chlorite is a major phase with Ni contents of the order of 3 and 7 wt% NiO, respectively. Fe-oxy-hydroxides (mean NiO = 1.8 wt%) are also abundant in the ferruginous and ochreous saprolites. According to the isocon method, Al and Ti are definitely enriched in the saprolite compared to dunite. The source of Al for chlorite formation probably derives from pyroxenites and peridotite. The lateral migration of Al in solution was fundamental for the supergene formation of chlorite. |
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Brazilian Journal of Geology |
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The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazilnickeliferous chloriteNi-lateritemass balanceSanta FéBrazilAbstract The Santa Fé Ni laterite deposit (Brazil) developed as a consequence of weathering of serpentinized dunites that produced a regolith in which the main Ni ore zone is a ferruginous saprolite with chlorite as the main ore-carrier along with Ni-bearing Fe-oxyhydroxides. The genesis of chlorite is related to hydrothermal alteration of spinel. This study found that part of the chlorite has a supergene origin. XRPD-Rietveld method and EMPA/SEM analyses coupled with geochemical and mass balance calculations have provided further information about the chemistry and mineralogy of the main ore minerals. An attempt is made to explain the mode of formation of secondary chlorite and associated ore minerals. The main Ni-bearing minerals in the green saprolite are serpentine and minor chlorite. In the ferruginous and ochreous saprolites chlorite is a major phase with Ni contents of the order of 3 and 7 wt% NiO, respectively. Fe-oxy-hydroxides (mean NiO = 1.8 wt%) are also abundant in the ferruginous and ochreous saprolites. According to the isocon method, Al and Ti are definitely enriched in the saprolite compared to dunite. The source of Al for chlorite formation probably derives from pyroxenites and peridotite. The lateral migration of Al in solution was fundamental for the supergene formation of chlorite.Sociedade Brasileira de Geologia2021-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892021000300308Brazilian Journal of Geology v.51 n.3 2021reponame:Brazilian Journal of Geologyinstname:Sociedade Brasileira de Geologia (SBGEO)instacron:SBGEO10.1590/2317-4889202120200119info:eu-repo/semantics/openAccessMachado,Matheus LamasPorto,Claudio GerheimSantoro,LiciaPutzolu,FrancescoNeumann,ReinerBastos Neto,ArturPolivanov,HelenaHerrington,Richardpor2021-11-03T00:00:00Zoai:scielo:S2317-48892021000300308Revistahttp://bjg.siteoficial.ws/index.htmhttps://old.scielo.br/oai/scielo-oai.phpsbgsede@sbgeo.org.br||claudio.riccomini@gmail.com2317-46922317-4692opendoar:2021-11-03T00:00Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO)false |
dc.title.none.fl_str_mv |
The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazil |
title |
The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazil |
spellingShingle |
The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazil Machado,Matheus Lamas nickeliferous chlorite Ni-laterite mass balance Santa Fé Brazil |
title_short |
The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazil |
title_full |
The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazil |
title_fullStr |
The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazil |
title_full_unstemmed |
The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazil |
title_sort |
The origin of supergene nickeliferous chlorite in the Santa Fé Ni-Laterite Deposit, GO, Brazil |
author |
Machado,Matheus Lamas |
author_facet |
Machado,Matheus Lamas Porto,Claudio Gerheim Santoro,Licia Putzolu,Francesco Neumann,Reiner Bastos Neto,Artur Polivanov,Helena Herrington,Richard |
author_role |
author |
author2 |
Porto,Claudio Gerheim Santoro,Licia Putzolu,Francesco Neumann,Reiner Bastos Neto,Artur Polivanov,Helena Herrington,Richard |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Machado,Matheus Lamas Porto,Claudio Gerheim Santoro,Licia Putzolu,Francesco Neumann,Reiner Bastos Neto,Artur Polivanov,Helena Herrington,Richard |
dc.subject.por.fl_str_mv |
nickeliferous chlorite Ni-laterite mass balance Santa Fé Brazil |
topic |
nickeliferous chlorite Ni-laterite mass balance Santa Fé Brazil |
description |
Abstract The Santa Fé Ni laterite deposit (Brazil) developed as a consequence of weathering of serpentinized dunites that produced a regolith in which the main Ni ore zone is a ferruginous saprolite with chlorite as the main ore-carrier along with Ni-bearing Fe-oxyhydroxides. The genesis of chlorite is related to hydrothermal alteration of spinel. This study found that part of the chlorite has a supergene origin. XRPD-Rietveld method and EMPA/SEM analyses coupled with geochemical and mass balance calculations have provided further information about the chemistry and mineralogy of the main ore minerals. An attempt is made to explain the mode of formation of secondary chlorite and associated ore minerals. The main Ni-bearing minerals in the green saprolite are serpentine and minor chlorite. In the ferruginous and ochreous saprolites chlorite is a major phase with Ni contents of the order of 3 and 7 wt% NiO, respectively. Fe-oxy-hydroxides (mean NiO = 1.8 wt%) are also abundant in the ferruginous and ochreous saprolites. According to the isocon method, Al and Ti are definitely enriched in the saprolite compared to dunite. The source of Al for chlorite formation probably derives from pyroxenites and peridotite. The lateral migration of Al in solution was fundamental for the supergene formation of chlorite. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892021000300308 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892021000300308 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
10.1590/2317-4889202120200119 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Geologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Geologia |
dc.source.none.fl_str_mv |
Brazilian Journal of Geology v.51 n.3 2021 reponame:Brazilian Journal of Geology instname:Sociedade Brasileira de Geologia (SBGEO) instacron:SBGEO |
instname_str |
Sociedade Brasileira de Geologia (SBGEO) |
instacron_str |
SBGEO |
institution |
SBGEO |
reponame_str |
Brazilian Journal of Geology |
collection |
Brazilian Journal of Geology |
repository.name.fl_str_mv |
Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO) |
repository.mail.fl_str_mv |
sbgsede@sbgeo.org.br||claudio.riccomini@gmail.com |
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1752122399468290048 |