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Title: The Statherian itabirite-bearing sequence from the Morro Escuro Ridge, Santa Maria de Itabira, Minas Gerais, Brazil.
Authors: Braga, Flávia Cristina Silveira
Rosière, Carlos Alberto
Queiroga, Gláucia Nascimento
Rolim, Vassily Khoury
Santos, João Orestes Schneider
McNaughton, Neal Jesse
Keywords: Morro Escuro Ridge
Serro group
Issue Date: 2015
Citation: BRAGA, F. C. S. et al. The Statherian itabirite-bearing sequence from the Morro Escuro Ridge, Santa Maria de Itabira, Minas Gerais, Brazil. Journal of South American Earth Sciences, v. 58, p. 33-53, 2014. Disponível em: <>. Acesso em: 01 set. 2015.
Abstract: The itabirite-bearing metasedimentary sequence from Morro Escuro Ridge comprises the basal units of the Espinhaço Supergroup and makes up a small tectonic inlier developed during one of the Brasiliano orogenic events (800-500 Ma), amongst horses of the Archean TTG gneisses, including sheared granites of the anorogenic Borrachudos Suite (~1700 Ma). The metasedimentary rocks are comprised of low-to intermediate-amphibolite facies schists, quartzites, conglomerates and banded iron formation (itabirite) correlatable with the sequences of the Serro Group, which underlies the metasedimentary rocks of the Espinhaço Supergroup in the Serra da Serpentina Ridge. A maximum Statherian deposition age (1668 Ma) was established using SHRIMP UePb isotopic constraints on zircon grains from conglomerate and quartzite units overlying the itabirite. The itabirite is predominantly hematitic and its geochemical characteristics are typical of a Lake Superior-type BIF deposited in a platformal, suboxic to anoxic environment distant from Fe-bearing hydrothermal vents. Close to the contact zone with amphibolites of the Early Neoproterozoic Pedro Lessa mafic suite, an increase of the magnetite content and crystallization of metasomatic Mg-hornblende and Ce-allanite can be observed. These mineralogical changes developed preferentially along the igneous contact zone but are probably co-genetic with the formation of alteration haloes in zircon grains during the Neoproterozoic Brasiliano orogeny (506 ± 6 Ma).
ISSN: 0895-9811
metadata.dc.rights.license: O periódico Journal of South American Earth Sciences concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3701420841533.
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