Chromite Oxidation by Manganese Oxides and Fossilized Microorganisms in Subsea Basalts
Author Information
Author(s): Ivarsson Magnus, Broman Curt, Holm Nils G
Primary Institution: Swedish Museum of Natural History
Hypothesis
The oxidation of chromite by manganese oxides in subseafloor basalts is mediated by microbial activity.
Conclusion
The study suggests that chromite oxidation by manganese oxides in subseafloor basalts is linked to the presence of fossilized microorganisms.
Supporting Evidence
- Chromite is oxidized to Cr(VI) in the presence of manganese oxides.
- Putative fossilized microorganisms were found in the rhodochrosite.
- The mineral succession observed suggests microbial involvement in chromite oxidation.
- The study indicates that subseafloor environments can support microbial life.
Takeaway
This study found that certain minerals in the ocean floor can change due to bacteria, and some of these bacteria might have left behind tiny fossils.
Methodology
Thin sections of basalt samples were analyzed using microscopy, ESEM/EDS, and Raman spectroscopy.
Limitations
The study lacks sufficient chemical data to confirm the presence of organic remnants indicative of life.
Digital Object Identifier (DOI)
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