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

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dc.contributor.authorMassuda, Amanda Juliano
dc.contributor.authorHartmann, Leo Afraneo
dc.contributor.authorQueiroga, Gláucia Nascimento
dc.contributor.authorCastro, Marco Paulo de
dc.contributor.authorLeandro, Carolina Gonçalves
dc.contributor.authorSavian, Jairo Francisco
dc.date.accessioned2021-08-16T13:35:31Z
dc.date.available2021-08-16T13:35:31Z
dc.date.issued2020pt_BR
dc.description.abstractMineralogical 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.pt_BR
dc.identifier.citationMASSUDA, A. J. et al. Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane. Brazilian Journal of Geology, v. 50, n. 4, p. e20190120, 2020. Disponível em: <https://www.scielo.br/scielo.php?pid=S2317-48892020000400307&script=sci_arttext&tlng=en>. Acesso em: 19 fev. 2021.pt_BR
dc.identifier.doihttp://dx.doi.org/10.1590/2317-4889202020190120pt_BR
dc.identifier.issn2317-4692
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/13478
dc.language.isoen_USpt_BR
dc.rightsabertopt_BR
dc.rights.licenseThis is an open access article distributed under the terms of the Creative Commons license. Fonte: o PDF do artigo.pt_BR
dc.subjectChromite-talc-magnesite granofelspt_BR
dc.subjectTourmalinitept_BR
dc.subjectMetasomatismpt_BR
dc.subjectAerogeophysicspt_BR
dc.titleMineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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