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Title: Alabandite (MnS) in metamorphosed manganiferous rocks at Morro da Mina, Brazil : palaeoenvironmental significance.
Authors: Cabral, Alexandre Raphael
Zeh, Armin
Viana, Nívea Cristina da Silva
Castro, Marco Paulo de
František, Lehmann
Queiroga, Gláucia Nascimento
Keywords: Graphite
Redox conditions
Manganese ore
Issue Date: 2019
Citation: CABRAL, A. R. et al. Alabandite (MnS) in metamorphosed manganiferous rocks at Morro da Mina, Brazil: palaeoenvironmental significance. European Journal of Mineralogy, v. 31, n. 5-6, p. 973-982, jul. 2019. Disponível em: <>. Acesso em: 10 mar. 2020.
Abstract: The mineral alabandite, cubic MnS with variable amounts of FeS, occurs in a number of mineral assemblages in manganiferous metasedimentary rocks, some of which are mined as manganese ore. One of them is Morro da Mina, Mina Gerais, Brazil, where alabandite is a minor component of “queluzite”, a manganese-silicate–carbonate rock. The Morro da Mina alabandite contains 7.3 ± 1.4 mol% FeS and makes up aggregates with graphite and molybdenite. A comparison of alabandite occurrences worldwide indicates four main types of mineral assemblages: (1) alabandite + graphite; (2) alabandite + graphite + molybdenite; (3) alabandite + rhodochrosite + molybdenite; (4) and alabandite + rhodochrosite. The different assemblages suggest that manganese sulfide formed in a range of marine palaeoenvironments, from highly reducing and sulfidic – i.e., euxinic – settings to manganeseoxide-precipitating conditions. Morro da Mina represents assemblage (2), which is characteristic of a euxinic water column in a stratified ocean. In general, our comparison of alabandite-bearing mineral assemblages indicates that palaeoenvironmental information can be retrieved from sedimentary rocks that experienced variable degrees of metamorphic overprint.
ISSN: 1617-4011
Appears in Collections:DEGEO - Artigos publicados em periódicos

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