Alabandite (MnS) in metamorphosed manganiferous rocks at Morro da Mina, Brazil : palaeoenvironmental significance.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorCabral, Alexandre Raphael-
Autor(es): dc.creatorZeh, Armin-
Autor(es): dc.creatorViana, Nívea Cristina da Silva-
Autor(es): dc.creatorCastro, Marco Paulo de-
Autor(es): dc.creatorFrantišek, Lehmann-
Autor(es): dc.creatorQueiroga, Gláucia Nascimento-
Data de aceite: dc.date.accessioned2025-08-21T15:10:12Z-
Data de disponibilização: dc.date.available2025-08-21T15:10:12Z-
Data de envio: dc.date.issued2020-04-13-
Data de envio: dc.date.issued2020-04-13-
Data de envio: dc.date.issued2019-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/12060-
Fonte completa do material: dc.identifierhttps://www.schweizerbart.de/papers/ejm/detail/31/92473/Alabandite_MnS_in_metamorphosed_manganiferous_rock?af=crossref-
Fonte completa do material: dc.identifierhttps://doi.org/10.1127/ejm/2019/0031-2879-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1004223-
Descrição: dc.descriptionThe 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.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectGraphite-
Palavras-chave: dc.subjectMolybdenite-
Palavras-chave: dc.subjectRedox conditions-
Palavras-chave: dc.subjectManganese ore-
Título: dc.titleAlabandite (MnS) in metamorphosed manganiferous rocks at Morro da Mina, Brazil : palaeoenvironmental significance.-
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