Oceanic crust and mantle evidence for the evolution of tonian-cryogenian ophiolites, southern Brasiliano Orogen.

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dc.contributor.authorWerle, Mariana
dc.contributor.authorHartmann, Leo Afraneo
dc.contributor.authorQueiroga, Gláucia Nascimento
dc.contributor.authorLana, Cristiano de Carvalho
dc.contributor.authorSilva, Juliana Pertille da
dc.contributor.authorMichelin, Cassiana Roberta Lizzoni
dc.contributor.authorRemus, Marcus Vinicius Dorneles
dc.contributor.authorRoberts, Malcolm
dc.contributor.authorCastro, Marco Paulo de
dc.contributor.authorLeandro, Carolina Gonçalves
dc.contributor.authorSavian, Jairo Francisco
dc.date.accessioned2021-07-26T22:13:51Z
dc.date.available2021-07-26T22:13:51Z
dc.date.issued2020pt_BR
dc.description.abstractUnravelling the complexity of tonian-cryogenian (950–680 Ma) evolution of ophiolites requires the search for rare mineral systems and their quantification with varied techniques. Ophiolites in the Brasiliano Orogen are widely distributed over 2,000 km along the eastern half of South America. We selected two ophiolites from different geotectonic settings of the Sul-Riograndense Shield, southern Brasiliano Orogen, to delimit the evolution of the oceanic phase of the orogen. The southern portion of the Bossoroca ophiolite is inserted in the Sao ˜ Gabriel juvenile terrane and contains rare metasomatic tourmaline in chloritite close to serpentinite and metamorphosed Cr-spinel. The southern Bossoroca ophiolite was intruded by Cerro da Cria and Ramada Granites and the U-Pb-Hf isotopic study of zircon from these rocks constrains the crustal evolution of the Sao ˜ Gabriel juvenile terrane. Capan´e ophiolite has similar age (793–715 Ma) as the Bossoroca ophiolite and was inserted in the Porongos fold-thrust belt with preserved Cr-spinel of mantellic composition. Integrated use of Cr-spinel mineral chemistry, B isotopes in tourmaline in the Bossoroca ophiolite and zircon U-Pb-Hf isotopes of granites associated with the southern Bossoroca ophiolite revealed several steps in the evolution of the ophiolites in the Dom Feliciano Belt. Capan´e Cr-spinel cores have mantle-derived compositions (Mg# 0.66 – 0.69; Cr# 0.51 – 0.53), tourmaline from the Bossoroca ophiolite is dravite and has δ11B = 0 to + 3, and granites crystallization ages are 578 ± 3.2 and 612 ± 12 Ma (εHfzrn = − 10 to − 25). Zircon from other dravite occurrences of the Bossoroca ophiolite were previously dated at 920 Ma. We unraveled the main steps in the evolution of ophiolites from the southern Brasiliano Orogen, with emphasis on the Bossoroca and Capan´e ophiolites, during their trajectory from mid-ocean ridge (920 Ma), formation of dravite in oceanic crust, preservation of mantellic cores in Cr-spinel, and intrusion of craton-generated granites at 612–578 Ma.pt_BR
dc.identifier.citationWERLE, M. et al. Oceanic crust and mantle evidence for the evolution of tonian-cryogenian ophiolites, southern Brasiliano Orogen. Precambrian Research, v. 351, p. 105979, dez. 2020. Disponível em: <https://www.sciencedirect.com/science/article/abs/pii/S0301926820305684>. Acesso em: 19 fev. 2021.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.precamres.2020.105979pt_BR
dc.identifier.issn0301-9268
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/13414
dc.identifier.uri2https://www.sciencedirect.com/science/article/abs/pii/S0301926820305684pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectMetasomatic tourmalinept_BR
dc.subjectMantle-derived cr-spinelpt_BR
dc.subjectB isotopespt_BR
dc.subjectCrustal evolutionpt_BR
dc.titleOceanic crust and mantle evidence for the evolution of tonian-cryogenian ophiolites, southern Brasiliano Orogen.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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