Celadonite and smectite formation in the Úrkút Mn-carbonate ore deposit (Hungary)

Synsedimentary and early diagenetic oxygen levels are estimated by evaluating celadonite–smectite formation in Jurassic marine black shale-hosted manganese carbonates. Celadonite formed under suboxic–dysaerobic conditions, Al-rich Fe-smectite formed under suboxic–anaerobic conditions, and nontronite...

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Bibliographic Details
Published in:Sedimentary geology 2013-08, Vol.294, p.157-163
Main Authors: Polgári, Márta, Hein, J.R., Németh, T., Pál-Molnár, E., Vigh, T.
Format: Article
Language:English
Subjects:
Celadonite
Jurassic
Microbial Fe oxidation
Mn carbonate ore
Nontronite
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Summary:Synsedimentary and early diagenetic oxygen levels are estimated by evaluating celadonite–smectite formation in Jurassic marine black shale-hosted manganese carbonates. Celadonite formed under suboxic–dysaerobic conditions, Al-rich Fe-smectite formed under suboxic–anaerobic conditions, and nontronite formed under anoxic-anaerobic conditions during sedimentary burial. A genetic pathway by direct precipitation from solution is proposed for the enormous mass of celadonite based on mineral and textural evidence. Lamination of the manganese ore is independent of clay-mineral composition and was created by a series of mineralized Fe-rich biomats.
ISSN:0037-0738
DOI:10.1016/j.sedgeo.2013.05.017