Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane.

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorMassuda, Amanda Juliano-
Autor(es): dc.creatorHartmann, Leo Afraneo-
Autor(es): dc.creatorQueiroga, Gláucia Nascimento-
Autor(es): dc.creatorCastro, Marco Paulo de-
Autor(es): dc.creatorLeandro, Carolina Gonçalves-
Autor(es): dc.creatorSavian, Jairo Francisco-
Data de aceite: dc.date.accessioned2022-02-21T19:58:01Z-
Data de disponibilização: dc.date.available2022-02-21T19:58:01Z-
Data de envio: dc.date.issued2021-08-16-
Data de envio: dc.date.issued2021-08-16-
Data de envio: dc.date.issued2019-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/jspui/handle/123456789/13478-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1590/2317-4889202020190120-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/650328-
Descrição: dc.descriptionMineralogical evolution of ophiolites is significant to understand paleo-oceanic crust and mantle requiring multi-proxy techniques to identify steps in the processes. We studied the Bossoroca ophiolite from the southern Brasiliano Orogen, a prime example of Tonian accretion to an oceanic island arc. Integration of field geology, aeromagnetometry, aerogamaspectrometry, electron microprobe analyses, and compositional maps of minerals led to the decoding of oceanic and continental processes. The ophiolite is highly magnetic and low-K and is positioned at the base of the superstructure. We studied amphibolite, tourmalinite, and chromite-talc-magnesite granofels from the ophiolite, Capivaras diorite from the Cambaí Complex infrastructure and one metavolcanoclastic rock from the Vacacaí Group superstructure. Honblende is zoned in all rock types. Low-Ti hornblende is compatible with medium-pressure metamorphism at 7 kbar. This M1 to M2 amphibolite facies resulted in the widespread association of olivine + talc in metaserpentinite. Dravite is similar to tourmaline from the Ibaré ophiolite. Andesine and oligoclase are dominant and albite minor. Cr-spinel in granofels recrystallized in greenschist facies; host rock originated by carbonatization of serpentinite formed in the oceanic crust along with chloritite and tourmalinite. Serpentinite rare earth elements (REE) suggest origin in depleted mantle peridotite. The ophiolite evolved in the Adamastor Ocean until incorporation into the island arc.-
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: o PDF do artigo.-
Palavras-chave: dc.subjectChromite-talc-magnesite granofels-
Palavras-chave: dc.subjectTourmalinite-
Palavras-chave: dc.subjectMetasomatism-
Palavras-chave: dc.subjectAerogeophysics-
Título: dc.titleMineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane.-
Aparece nas coleções:Repositório Institucional - UFOP

Não existem arquivos associados a este item.