The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil.

Detalhes bibliográficos
Ano de defesa: 2022
Autor(a) principal: Carvalho, Luisa Diniz Vilela de
Orientador(a): Cipriano, Ricardo Augusto Scholz, Jalowitzki, Tiago Luis Reis
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: eng
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Manto - geologia - manto litosférico subcontinental
Diamantes
Rochas ígneas - kimberlitos
Link de acesso: http://www.repositorio.ufop.br/jspui/handle/123456789/15163
Resumo: Programa de Pós-Graduação em Evolução Crustal e Recursos Naturais. Departamento de Geologia, Escola de Minas, Universidade Federal de Ouro Preto.
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spelling Carvalho, Luisa Diniz Vilela deCipriano, Ricardo Augusto ScholzQueiroga, Gláucia NascimentoMartins, Maximiliano de SouzaStachel, ThomasHarris, JeffCipriano, Ricardo Augusto ScholzJalowitzki, Tiago Luis Reis2022-08-24T19:25:04Z2022-08-24T19:25:04Z2022CARVALHO, Luisa Diniz Vilela de. The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil. 2022. 145 f. Tese (Doutorado em Evolução Crustal e Recursos Naturais) – Escola de Minas, Universidade Federal de Ouro Preto, Ouro Preto, 2022.http://www.repositorio.ufop.br/jspui/handle/123456789/15163Programa de Pós-Graduação em Evolução Crustal e Recursos Naturais. Departamento de Geologia, Escola de Minas, Universidade Federal de Ouro Preto.O manto litosférico sob a Província Ígnea do Alto Paranaíba, sudoeste do Cráton do São Francisco, foi investigado pior meio do estudo de concentrados minerais de um kimberlito cretáceo recém-descoberto (idade U-Pb em zircão 90,0 ± 1,3 Ma; 2σ), denominado Osvaldo França 1, e por meio de diamantes recuperados em depósitos aluvionares da região do Alto Paranaíba. Xenocristais de granada indicam alta predominância de lherzolitos sobre harzburgitos e wehrlitos. Inclusões minerais em diamantes sugerem que lherzolitos são as principais rochas-fonte do diamante, seguidos por eclogitos, harzburgitos e websteritos. Baixo nível de depleção química registrado por inclusões e xenocristais lherzolíticos indica provável idade pós-arqueana para o manto litosférico sob essa parte do Cráton do São Francisco. Inclusões e xenocristais de granada documentam que substratos previamente depletados no manto foram afetados por metassomatismo. Padrões sinusoidais de elementos terras raras indicam baixos graus de metassomatismo por fluidos ou fusões sílico-carbonatíticas (proto-kimberlíticas). Padrões de elementos traços de inclusões eclogíticas e websteríticas estabelecem clara ligação entre processos de subducção e a formação dos diamantes na margem sudoeste do Cráton do São Francisco. Elementos terras raras calculados para rocha total correspondem a típicas seções da crosta oceânica superior e termometria das inclusões indica derivação da base da litosfera. Termobarometria baseada em inclusões de piroxênio indica gradiente geotérmico de 39 mW/m2 no momento da formação do diamante e último equilíbrio. Termobarometria baseada em xenocristais de granada, por outro lado, está de acordo com uma geoterma de ~37 mW/m2, proposta anteriormente para a região. Com uma janela de ~60 km de espessura na zona de estabilidade do diamante, substratos eclogíticos e websteríticos indicam derivação da base da litosfera, enquanto diamantes lherzolíticos são menos profundos. Temperaturas calculadas com base no estado de agregação do nitrogênio no diamante indicam que eclogitos, websteritos e pelo menos parte da população de diamantes peridotíticos experimentaram longo tempo de residência no manto (~2,0 Ga) a altas temperaturas (> 1200 °C). O envolvimento de material subductado e o longo período de residência no manto necessário para explicar o alto estado de agregação do nitrogênio nos diamantes deste estudo apontam para provável acréscimo/modificação das raízes mantélicas na borda sudoeste do Cráton do São Francisco durante uma orogenia paleoproterozoica (2,2-1,9 Ga). Embora a presença de um manto eclogítico seja evidente a partir do estudo de inclusões, a ausência de granadas eclogíticas no kimberlito Osvaldo França 1 e a baixa representação nos dados de xenocristais da literatura, podem implicar em preservação restrita de xenólitos/xenocristais eclogíticos relacionada ao caráter do magma que trouxe os diamantes à superfície. Fases primárias do kimberlito Osvaldo França 1 sugerem componente enriquecido na fonte do magma, conferindo caráter exótico ao kimberlito. Com base nos resultados deste estudo, futuras campanhas de exploração devem considerar novas abordagens para avaliar o potencial lherzolítico e eclogítico de fontes primárias.The lithospheric mantle underpinning the Alto Paranaíba Igneous Province, southwestern São Francisco Craton, was investigated through the study of mineral concentrates from a newly discovered Late Cretaceous kimberlite (U-Pb zircon age 90.0 ± 1.3 Ma; 2σ), named Osvaldo França 1, and through diamonds recovered from alluvial deposits in the region. Garnet xenocrysts show a strong predominance of lherzolitic over minor harzburgitic and wehrlitic compositions. Mineral inclusions in diamonds suggest that lherzolite is the main diamond source-rock, followed by eclogite, harzburgite and minor websterite. The limited chemical depletion recorded in lherzolitic inclusions and xenocrysts indicates a likely post-Archean age for the lithospheric mantle beneath this part of the São Francisco Craton. Garnet inclusions and xenocrysts document that previously depleted substrates in the subcratonic lithospheric mantle were affected by metasomatism. Sinusoidal rare earth element patterns indicate overall low degrees of metasomatism by fluids or silico-carbonatitic (proto-kimberlitic) melts. Trace element patterns of eclogitic and websteritic inclusions establish a clear link between subduction processes and diamond formation in the southwestern margin of the São Francisco Craton. Calculated bulk rare earth element compositions match typical sections of upper oceanic crust, and inclusion thermometry places these substrates at the base of the lithosphere. Pyroxene inclusion-based thermobarometry indicates a 39 mW/m2 geothermal gradient at the time of diamond formation and last equilibration. Garnet xenocryst-based thermobarometry, on the other hand, is in agreement with the ~37 mW/m2 geotherm that was previously proposed for the region based on clinopyroxene from concentrate. With a diamond window of ~60 km thickness, eclogitic and websteritic diamond substrates indicate derivation from the base of the lithosphere, while lherzolitic diamonds originate from shallower depths within the diamond stability field. Nitrogen-based temperatures indicate that eclogitic, websteritic and at least part of the peridotitic diamond population experienced extended (~2.0 byr) mantle residence at high temperatures (>1200 °C). The involvement of subducted material and the long mantle residence time required to explain the high aggregation state of nitrogen in the studied diamonds, point to accretion of subducted material or modification of the mantle roots in the southwestern São Francisco Craton during a Paleoproterozoic orogeny (2.2-1.9 Ga). Although the presence of a diamondiferous eclogitic mantle is evident from studied inclusions, the absence of eclogitic garnets in the Osvaldo França 1 kimberlite and their low representation in the xenocrystic record from the literature, may imply limited preservation of eclogitic xenoliths/xenocrysts related to the character of the magma that brought the diamonds to the surface. Primary phases from the Osvaldo França 1 kimberlite suggest an enriched component in the magma source, giving an exotic character to the kimberlite. Based on the results of this study, future exploration efforts should consider new approaches to evaluate lherzolitic and eclogitic diamond potential.http://creativecommons.org/licenses/by-nc-nd/3.0/us/Autorização concedida ao Repositório Institucional da UFOP pelo(a) autor(a) em 12/08/2022 com as seguintes condições: disponível sob Licença Creative Commons 4.0 que permite copiar, distribuir e transmitir o trabalho, desde que sejam citados o autor e o licenciante. 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dc.title.pt_BR.fl_str_mv The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil.
dc.title.alternative.pt_BR.fl_str_mv O manto litosférico subcontinental e as ocorrências de diamantes na região do Alto Paranaíba, sudoeste do Cráton São Francisco.
title The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil.
spellingShingle The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil.
Carvalho, Luisa Diniz Vilela de
Manto - geologia - manto litosférico subcontinental
Diamantes
Rochas ígneas - kimberlitos
title_short The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil.
title_full The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil.
title_fullStr The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil.
title_full_unstemmed The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil.
title_sort The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil.
author Carvalho, Luisa Diniz Vilela de
author_facet Carvalho, Luisa Diniz Vilela de
author_role author
dc.contributor.referee.pt_BR.fl_str_mv Cipriano, Ricardo Augusto Scholz
Queiroga, Gláucia Nascimento
Martins, Maximiliano de Souza
Stachel, Thomas
Harris, Jeff
dc.contributor.author.fl_str_mv Carvalho, Luisa Diniz Vilela de
dc.contributor.advisor1.fl_str_mv Cipriano, Ricardo Augusto Scholz
Jalowitzki, Tiago Luis Reis
contributor_str_mv Cipriano, Ricardo Augusto Scholz
Jalowitzki, Tiago Luis Reis
dc.subject.por.fl_str_mv Manto - geologia - manto litosférico subcontinental
Diamantes
Rochas ígneas - kimberlitos
topic Manto - geologia - manto litosférico subcontinental
Diamantes
Rochas ígneas - kimberlitos
description Programa de Pós-Graduação em Evolução Crustal e Recursos Naturais. Departamento de Geologia, Escola de Minas, Universidade Federal de Ouro Preto.
publishDate 2022
dc.date.accessioned.fl_str_mv 2022-08-24T19:25:04Z
dc.date.available.fl_str_mv 2022-08-24T19:25:04Z
dc.date.issued.fl_str_mv 2022
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.citation.fl_str_mv CARVALHO, Luisa Diniz Vilela de. The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil. 2022. 145 f. Tese (Doutorado em Evolução Crustal e Recursos Naturais) – Escola de Minas, Universidade Federal de Ouro Preto, Ouro Preto, 2022.
dc.identifier.uri.fl_str_mv http://www.repositorio.ufop.br/jspui/handle/123456789/15163
identifier_str_mv CARVALHO, Luisa Diniz Vilela de. The subcontinental lithospheric mantle and the diamond occurrences in the Alto Paranaíba region, southwestern São Francisco Craton, Brazil. 2022. 145 f. Tese (Doutorado em Evolução Crustal e Recursos Naturais) – Escola de Minas, Universidade Federal de Ouro Preto, Ouro Preto, 2022.
url http://www.repositorio.ufop.br/jspui/handle/123456789/15163
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv http://creativecommons.org/licenses/by-nc-nd/3.0/us/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/3.0/us/
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dc.source.none.fl_str_mv reponame:Repositório Institucional da UFOP
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