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Título: | Alabandite (MnS) in metamorphosed manganiferous rocks at Morro da Mina, Brazil : palaeoenvironmental significance. |
Autor(es): | Cabral, Alexandre Raphael Zeh, Armin Viana, Nívea Cristina da Silva Castro, Marco Paulo de František, Lehmann Queiroga, Gláucia Nascimento |
Palavras-chave: | Graphite Molybdenite Redox conditions Manganese ore |
Data do documento: | 2019 |
Referência: | 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: <https://www.schweizerbart.de/papers/ejm/detail/31/92473/Alabandite_MnS_in_metamorphosed_manganiferous_rock?af=crossref>. Acesso em: 10 mar. 2020. |
Resumo: | 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. |
URI: | http://www.repositorio.ufop.br/handle/123456789/12060 |
Link para o artigo: | https://www.schweizerbart.de/papers/ejm/detail/31/92473/Alabandite_MnS_in_metamorphosed_manganiferous_rock?af=crossref |
DOI: | https://doi.org/10.1127/ejm/2019/0031-2879 |
ISSN: | 1617-4011 |
Aparece nas coleções: | DEGEO - Artigos publicados em periódicos |
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ARTIGO_AlabanditeMetamorphosedManganiferous.pdf Restricted Access | 47,2 kB | Adobe PDF | Visualizar/Abrir |
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