Chemical Formula
Mn, MnO2
Definition
Manganese (Mn) is a transition metal present at trace levels in the modern ocean where it cycles between three oxidation states, +2, +3, and +4. Mn is a cofactor in enzymes critical for life, including the oxygen-evolving complex of photosystem II involved in oxygenic photosynthesis and superoxide dismutase (SOD) that degrades oxygen radicals responsible for oxidative stress. Mn(IV) forms a suite of Mn oxide minerals found within marine ferromanganese crusts and nodules that scavenge trace metals and record paleoredox conditions throughout Earth’s history. Mn oxides form within a wide range of environments, including deserts, and on Mars as rock varnish and crusts.
Overview
Manganese (Mn) oxides are widespread on Earth, occurring as particles or grain coatings, rock varnish, cave deposits, and ferromanganese crusts and nodules. Rocks and sediments enriched in Mn oxides have been observed on Mars (Lanza et al. 2014) and in early Earth strata (Crerar...
References and Further Reading
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Hansel, C.M. (2020). Manganese Oxidation. In: Gargaud, M., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27833-4_5403-1
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DOI: https://doi.org/10.1007/978-3-642-27833-4_5403-1
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