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Título: | Magmatic-hydrothermal fluids leaching older seafloor exhalative rocks to form the IOCG deposits of the Carajás Province, Brazil : evidence from boron isotopes. |
Autor(es): | Melo, Gustavo Henrique Coelho de Monteiro, Lena Virginia Soares Hunger, Raphael Bianchi Toledo, Poliana Iara Freitas Xavier, Roberto Perez Zhao, Xin-Fu Su, Zhi-Kun Moreto, Carolina Penteado Natividade Jesus, Silvandira dos Santos Goes Pereira de |
Palavras-chave: | Exhalative systems Magmatic brines Mineral system |
Data do documento: | 2021 |
Referência: | MELO, 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. |
Resumo: | The 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. |
URI: | http://www.repositorio.ufop.br/jspui/handle/123456789/15286 |
Link para o artigo: | https://www.sciencedirect.com/science/article/pii/S0301926821003405 |
DOI: | https://doi.org/10.1016/j.precamres.2021.106412 |
ISSN: | 0301-9268 |
Aparece nas coleções: | DEGEO - Artigos publicados em periódicos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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ARTIGO_MagmaticHydrothermalFluids.pdf Restricted Access | 8,26 MB | Adobe PDF | Visualizar/Abrir |
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