Metallogenetic Mn-model of the Rhyacian-aged Buritirama Formation, Carajás domain (Amazon Craton).

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorSalgado, Silas Santos-
Autor(es): dc.creatorCaxito, Fabrício de Andrade-
Autor(es): dc.creatorSilva, Rosaline Cristina Figueiredo e-
Autor(es): dc.creatorUhlein, Gabriel Jubé-
Autor(es): dc.creatorNogueira, Leonardo Brandão-
Autor(es): dc.creatorNalini Júnior, Hermínio Arias-
Autor(es): dc.creatorAranda, Ramon de Oliveira-
Data de aceite: dc.date.accessioned2025-08-21T15:21:32Z-
Data de disponibilização: dc.date.available2025-08-21T15:21:32Z-
Data de envio: dc.date.issued2022-09-14-
Data de envio: dc.date.issued2022-09-14-
Data de envio: dc.date.issued2020-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/jspui/handle/123456789/15262-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/pii/S0169136821004224-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.oregeorev.2021.104396-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1011710-
Descrição: dc.descriptionThe 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.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectManganese-
Palavras-chave: dc.subjectGeochemistry-
Palavras-chave: dc.subjectGeochemistry-
Palavras-chave: dc.subjectIsotopes-
Palavras-chave: dc.subjectNsuta-
Título: dc.titleMetallogenetic Mn-model of the Rhyacian-aged Buritirama Formation, Carajás domain (Amazon Craton).-
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