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Chromite oxidation by manganee oxides in subseafloor basalts and the presence of putative fossilized microorganisms
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
2011 (English)In: Geochemical Transactions, ISSN 1467-4866, E-ISSN 1467-4866, Vol. 12, 5- p.Article in journal (Refereed) Published
Abstract [en]

Chromite is a mineral with low solubility and is thus resistant to dissolution. The exception is when manganese oxides are available, since they are the only known naturally occurring oxidants for chromite. In the presence of Mn(IV) oxides, Cr(III) will oxidise to Cr(VI), which is more soluble than Cr(III), and thus easier to be removed. Here we report of chromite phenocrysts that are replaced by rhodochrosite (Mn(II) carbonate) in subseafloor basalts from the Koko Seamount, Pacific Ocean, that were drilled and collected during the Ocean Drilling Program (ODP) Leg 197. The mineral succession chromite-rhodochrosite-saponite in the phenocrysts is interpreted as the result of chromite oxidation by manganese oxides. Putative fossilized microorganisms are abundant in the rhodochrosite and we suggest that the oxidation of chromite has been mediated by microbial activity. It has previously been shown in soils and in laboratory experiments that chromium oxidation is indirectly mediated by microbial formation of manganese oxides. Here we suggest a similar process in subseafloor basalts.

Place, publisher, year, edition, pages
2011. Vol. 12, 5- p.
National Category
Other Earth and Related Environmental Sciences
Research subject
Geochemistry
Identifiers
URN: urn:nbn:se:su:diva-61760DOI: 10.1186/1467-4866-12-5ISI: 000291805800001OAI: oai:DiVA.org:su-61760DiVA: diva2:437443
Available from: 2011-08-29 Created: 2011-08-29 Last updated: 2017-12-08Bibliographically approved

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