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Characterization of manganese oxide mineralogy in rock varnish and dendrites using X-ray absorption spectroscopy
Abstract
X-ray absorption data were collected for a series of varnish and dendrite Mn oxide coatings on rock substrates containing a wide variety of mineralogies exposed to a variety of environments. Near-edge spectra of the coatings indicate that the Mn-oxide phases present have Mn valences between 3+ and 4+, with average Mn valences for the varnishes closer to 4+ than those for the dendrites. Mn EXAFS data and analyses indicate that Mn-oxide structure types for the varnishes range, perhaps continuously, from large tunnel phases, similar to todorokite and romanechite, to layer phases, i.e., birnessite-family. Similar results were found for the dendrite samples, except that the variety of Mn-oxide phases is somewhat larger than those found for the varnishes. No correlations were found between Mn-oxide structure-type within these coatings and the corresponding substrate petrology.
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Citations
Cited by
BIOGENIC MANGANESE OXIDES: Properties and Mechanisms of Formation
Tebo, B. M., Bargar, J. R., Clement, B. G., Dick, G. J., Murray, K. J., Parker, D., Verity, R., & Webb, S. M. (2004) · Annual Review of Earth and Planetary Sciences · doi:10.1146/annurev.earth.32.101802.120213 · Cited by 1,381
Geomicrobiology of manganese(II) oxidation
Tebo, B. M., Johnson, H. A., McCarthy, J. K., & Templeton, A. S. (2005) · Trends in Microbiology · doi:10.1016/j.tim.2005.07.009 · Cited by 772
Water-oxidation catalysis by manganese in a geochemical-like cycle
Hocking, R. K., Brimblecombe, R., Chang, L.-Y., Singh, A., Cheah, M. H., Glover, C., Casey, W. H., & Spiccia, L. (2011) · Nature Chemistry · doi:10.1038/nchem.1049 · Cited by 517
A critical review of the reactivity of manganese oxides with organic contaminants
Remucal, C. K., & Ginder-Vogel, M. (2014) · Environmental Science: Processes & Impacts · doi:10.1039/c3em00703k · Cited by 375
Determination of Mn valence states in mixed-valent manganates by XANES spectroscopy
Manceau, A., Marcus, M. A., & Grangeon, S. (2012) · American Mineralogist · doi:10.2138/am.2012.3903 · Cited by 351
Metadata
- Authors
- McKeown, D. A., & Post, J. E.
- Venue
- American Mineralogist
- Publisher
- Mineralogical Society of America
- Published
- 2001-05
- Volume
- 86
- Issue
- 5-6
- Pages
- 701-713
- ISSN
- 0003-004X (ISSN-L)
- OpenAlex
- W2244524084
- Cited by
- 275
- References
- 0
- FWCI
- 31.75
- Type
- journal article
- Language
- en
- Open access
- closed
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- McKeown, D. A., & Post, J. E. (2001). Characterization of manganese oxide mineralogy in rock varnish and dendrites using X-ray absorption spectroscopy. American Mineralogist. https://doi.org/10.2138/am-2001-5-611
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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