Ediacaran emerald mineralization in Northeastern Brazil : the case of the Fazenda Bonfim deposit

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorSantiago, Judiron Santos-
Autor(es): dc.creatorSouza, Valmir da Silva-
Autor(es): dc.creatorDantas, Elton Luiz-
Autor(es): dc.creatorOliveira, Claudinei Gouveia de-
Data de aceite: dc.date.accessioned2021-10-14T18:50:44Z-
Data de disponibilização: dc.date.available2021-10-14T18:50:44Z-
Data de envio: dc.date.issued2020-01-23-
Data de envio: dc.date.issued2020-01-23-
Data de envio: dc.date.issued2019-
Fonte completa do material: dc.identifierhttps://repositorio.unb.br/handle/10482/36684-
Fonte completa do material: dc.identifierhttps://doi.org/10.1590/2317-4889201920190081-
Fonte completa do material: dc.identifierhttp://orcid.org/0000-0003-0815-6790-
Fonte completa do material: dc.identifierhttp://orcid.org/0000-0002-4957-5951-
Fonte completa do material: dc.identifierhttp://orcid.org/0000-0002-7954-5059-
Fonte completa do material: dc.identifierhttp://orcid.org/0000-0002-0525-059X-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/641293-
Descrição: dc.descriptionThe Fazenda Bonfim emerald deposit lies within the Seridó Belt. It is a classic example of deposit formed through metasomatic interactions between Be-rich granite intrusions and Cr(± V)-rich mafic-ultramafic rocks. The setting of the emerald mineralization was built under strong strike-slip dynamics, which produced serpentinization and talcification of mafic-ultramafic host-rocks, and was followed by syn-kinematic emplacement of Be-rich albite granite, favoring hydrothermal/metasomatic processes. The structural control and lithological-contrast were fundamental to the fluid flow and the best ore-shoot geometry, developed in the S-foliation intra-plane at the contact zone (phlogopite hornfels) between mafic-ultramafic rocks and the albite granite. Subsequently, an albitization process, linked to the final-stage of magmatic crystallization, led to an overall mineralogical and chemical change of the albite granite. 207U-235Pb data revealed inheritance ages from Archean to Neoproterozoic and a crystallization age of 561 ± 4 Ma for albite granite. However, 40Ar/39Ar data revealed plateau age of 553 ± 4 Ma for phlogopite hornfels, interpreted as the closure time for the metasomatic event responsible for the nucleation and growth of emerald crystals. The short interval of time between U-Pb and Ar-Ar data indicates an intense, but not protracted, metasomatic history, probably due to low volume of intrusive magma.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Publicador: dc.publisherSociedade Brasileira de Geologia-
Direitos: dc.rightsAcesso Aberto-
Direitos: dc.rights(CC BY) - The autors. This is an open access article distributed under the terms of the Creative Commons license.-
Palavras-chave: dc.subjectPedras preciosas - minas e mineração - Brasil, Nordeste-
Palavras-chave: dc.subjectGeologia-
Palavras-chave: dc.subjectGeoquímica-
Palavras-chave: dc.subjectGeocronologia-
Título: dc.titleEdiacaran emerald mineralization in Northeastern Brazil : the case of the Fazenda Bonfim deposit-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional – UNB

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