Magmatic-hydrothermal fluids leaching older seafloor exhalative rocks to form the IOCG deposits of the Carajás Province, Brazil : evidence from boron isotopes.

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dc.contributor.authorMelo, Gustavo Henrique Coelho de
dc.contributor.authorMonteiro, Lena Virginia Soares
dc.contributor.authorHunger, Raphael Bianchi
dc.contributor.authorToledo, Poliana Iara Freitas
dc.contributor.authorXavier, Roberto Perez
dc.contributor.authorZhao, Xin-Fu
dc.contributor.authorSu, Zhi-Kun
dc.contributor.authorMoreto, Carolina Penteado Natividade
dc.contributor.authorJesus, Silvandira dos Santos Goes Pereira de
dc.date.accessioned2022-09-14T21:06:30Z
dc.date.available2022-09-14T21:06:30Z
dc.date.issued2021pt_BR
dc.description.abstractThe notable group of iron oxide-copper–gold (IOCG) deposits at the Carajas Province (Amazonian Craton, Brazil) contain remarkable copper reserves due to a complex Neoarchean metallogenetic evolution. The overlay of diachronic hydrothermal-mineralizing events is revealed by two clusters of boron isotope compositions of hy- drothermal tourmaline obtained in IOCG deposits (Salobo, Igarap ́e Bahia, GT-46, Grota Funda and Furnas) with (i) high δ11B (+8.2 to +17.2‰) and (ii) low δ11B (+3.4 to +9.8‰) values. The isotopically heavy boron sig- natures, recorded in tourmaline cores, are inherited from the volcano-sedimentary sequences of the ca. 2.76 Ga Itacaiúnas Supergroup, which includes exhalative tourmaline and spilites formed in extensive exhalative systems prior to the IOCG formation. During the main IOCG event at ca. 2.55 Ga, the regional circulation of magmatic- hydrothermal boron-rich fluids originated tourmaline rims and new crystals with lower δ11B values. We describe the critical role of an older volcano-sedimentary as a source for boron and likely metals leached by magmatic- hydrothermal fluids to form the IOCG deposits of the Carajas ́ Province.pt_BR
dc.identifier.citationMELO, G. H. C. de. et al. Magmatic-hydrothermal fluids leaching older seafloor exhalative rocks to form the IOCG deposits of the Carajás Province, Brazil: evidence from boron isotopes. Precambrian Research, v. 365, 2021. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0301926821003405>. Acesso em: 29 abr. 2022.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.precamres.2021.106412pt_BR
dc.identifier.issn0301-9268
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/15286
dc.identifier.uri2https://www.sciencedirect.com/science/article/pii/S0301926821003405pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectExhalative systemspt_BR
dc.subjectMagmatic brinespt_BR
dc.subjectMineral systempt_BR
dc.titleMagmatic-hydrothermal fluids leaching older seafloor exhalative rocks to form the IOCG deposits of the Carajás Province, Brazil : evidence from boron isotopes.pt_BR
dc.typeArtigo publicado em periodicopt_BR

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