Metallogenetic Mn-model of the Rhyacian-aged Buritirama Formation, Carajás domain (Amazon Craton).
dc.contributor.author | Salgado, Silas Santos | |
dc.contributor.author | Caxito, Fabrício de Andrade | |
dc.contributor.author | Silva, Rosaline Cristina Figueiredo e | |
dc.contributor.author | Uhlein, Gabriel Jubé | |
dc.contributor.author | Nogueira, Leonardo Brandão | |
dc.contributor.author | Nalini Júnior, Hermínio Arias | |
dc.contributor.author | Aranda, Ramon de Oliveira | |
dc.date.accessioned | 2022-09-14T19:13:12Z | |
dc.date.available | 2022-09-14T19:13:12Z | |
dc.date.issued | 2021 | pt_BR |
dc.description.abstract | The Mn-bearing Buritirama Formation is composed of clastic and chemical metasedimentary rocks representing a Rhyacian platformal basin (ca. 2.18–2.06 Ga) that limits the northern border of the Archean-Paleoproterozoic Caraj ́ as domain with the Paleoproterozoic Bacaj ́ a domain in the southern Amazon Craton, northern Brazil. The Buritirama Formation is divided into three main stratigraphic units. The Lower and Upper units consist of a basal quartzite followed by carbonate–silicate rocks (marls), dolomitic marbles (dolostone) and minor biotite schist while the Intermediate Unit consists of Mn-carbonate rocks topped by a supergene Mn-oxide deposit (Cenozoic age). These rocks were deformed and metamorphosed during the Transamazonian event (ca. 2.06 Ga). Geochemical data from dolomitic marbles (Lower Unit) exhibit negative Ce anomalies, high Y/Ho ratios (ca. 48) and seawater-like REE + Y patterns that reinforce an open platform setting for the Buritirama basin. Positive δ13C values (+3.2‰ to +5.0‰ V-PDB) for dolomitic marbles are considered to be an expression of the Loma- gundi Carbon Isotopic Excursion. The metallogenesis of Mn-carbonate rocks is evaluated based on redox- sensitive trace elements (e.g. Zn and Ni), PAAS-normalized REE + Y patterns and δ13C values (− 2.56‰ to +0.15‰ V-PDB) and point out to a classical multi-stage redox-controlled Mn-model involving: i) a primary hydrothermal fluid source related to ocean vents and/or normal faults; ii) microbially-mediated reduction of Mn- oxides particles at the ocean bottom; and iii) reactions between Mn2+ and CO3 2− (organic matter and seawater related), giving rise to diagenetic Mn-carbonates. The Rhyacian age, Mn deposits, and presence of Lomagundi- like δ13C allows to correlate the Buritirama Formation with the Aguas ́ Claras Formation within the Caraj ́ as domain further south, thus establishing an important metalliferous event that was up to now largely overlooked within the southern Amazon Craton. | pt_BR |
dc.identifier.citation | SALGADO, S. S. et al. Metallogenetic Mn-model of the Rhyacian-aged Buritirama Formation, Carajás domain (Amazon Craton). Ore Geology Reviews, v. 138, 2021. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0169136821004224>. Acesso em: 29 abr. 2022. | pt_BR |
dc.identifier.doi | https://doi.org/10.1016/j.oregeorev.2021.104396 | pt_BR |
dc.identifier.issn | 0169-1368 | |
dc.identifier.uri | http://www.repositorio.ufop.br/jspui/handle/123456789/15262 | |
dc.identifier.uri2 | https://www.sciencedirect.com/science/article/pii/S0169136821004224 | pt_BR |
dc.language.iso | en_US | pt_BR |
dc.rights | restrito | pt_BR |
dc.subject | Manganese | pt_BR |
dc.subject | Geochemistry | pt_BR |
dc.subject | Geochemistry | pt_BR |
dc.subject | Isotopes | pt_BR |
dc.subject | Nsuta | pt_BR |
dc.title | Metallogenetic Mn-model of the Rhyacian-aged Buritirama Formation, Carajás domain (Amazon Craton). | pt_BR |
dc.type | Artigo publicado em periodico | pt_BR |
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