Multi-method characterization of rare blue quartz-bearing metavolcanic rocks of the Rio dos Remédios Group, Paramirim Aulacogen, NE Brazil.

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Autor(es): dc.creatorSilva, Danielle Cruz da-
Autor(es): dc.creatorSantos, Lauro Cézar Montefalco de Lira-
Autor(es): dc.creatorQueiroga, Gláucia Nascimento-
Autor(es): dc.creatorSantos, Glenda Lira-
Autor(es): dc.creatorTedeschi, Mahyra-
Data de aceite: dc.date.accessioned2025-08-21T15:43:38Z-
Data de disponibilização: dc.date.available2025-08-21T15:43:38Z-
Data de envio: dc.date.issued2024-09-11-
Data de envio: dc.date.issued2024-09-11-
Data de envio: dc.date.issued2022-
Fonte completa do material: dc.identifierhttps://www.repositorio.ufop.br/handle/123456789/18588-
Fonte completa do material: dc.identifierhttps://doi.org/10.1590/2317-4889202320220034-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1022635-
Descrição: dc.descriptionThe Rio dos Remédios Group comprises a supracrustal sequence that occupies the base of the Espinhaço Supergroup, São Francisco Craton, Brazil. Its basal formation, Novo Horizonte, crops out in the Paramirim region mainly as metavolcanic rocks that represent one of the fewer occurrences of blue quartz phenocrysts in South America. Their mineralogy consists of quartz and K-feldspar phenocrysts, whereas biotite, muscovite, fluorite, allanite, chlorite, sericite, zircon, and opaque phases occur immersed in a quartz-feldspar-rich groundmass. Such hetero-geneous composition is also supported by x-ray diffraction and chemical data. Electron probe microanalysis in some samples revealed the presence of two distinct groups of biotite (magmatic and neoformed), in addition to the presence of iron-rich white mica and almost pure orthoclase feldspar. Our data suggest that the studied metavolcanic rocks have maintained their magmatic characteristics, which were progressively overprinted by hydrothermal fluids and ductile-to-brittle deformation. The magmatic mineralogy is akin to strongly peraluminous and alkaline magmas, common in anorogenic settings – a fertile site for the origin of blue quartz-bearing rocks worldwide.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsaberto-
Direitos: dc.rightsThis is an open access article distributed under the terms of the Creative Commons license. Fonte: PDF do artigo-
Palavras-chave: dc.subjectBlue quartz-bearing rocks petrology-
Palavras-chave: dc.subjectParamirim aulacogen-
Palavras-chave: dc.subjectSão Francisco craton-
Título: dc.titleMulti-method characterization of rare blue quartz-bearing metavolcanic rocks of the Rio dos Remédios Group, Paramirim Aulacogen, NE Brazil.-
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