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Pyroxene reflectance spectra: Minor absorption bands and effects of elemental substitutions

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dc.contributor.author Cloutis, Edward A.
dc.date.accessioned 2018-03-07T15:58:05Z
dc.date.available 2018-03-07T15:58:05Z
dc.date.issued 2002-06-13
dc.identifier.citation Cloutis, E.A. (2002) Pyroxene reflectance spectra: Minor absorption bands and effects of elemental substitutions. Journal of Geophysical Research - Planets,107, 5039, pp. 6-1 - 6-12. DOI: 10.1029/2001JE001590. en_US
dc.identifier.issn 2169-9097
dc.identifier.uri http://hdl.handle.net/10680/1394
dc.description.abstract Reflectance spectra of a suite of compositionally diverse pyroxenes exhibit variable spectral properties which are associated with various elemental substitutions. Those associated with transition series elements, such as Cr, Ti, V, and Mn, give rise to a number of minor absorption bands in the visible spectral region and, in some cases (e.g., Mn), at longer wavelengths. Substitutions by other cations, such as Li and Zr, do not result in distinct absorption bands. The spectra of these pyroxenes are dominated by the transition series elements that may be present in the samples. The visible wavelength region of low-calcium pyroxene reflectance spectra exhibit a number of absorption bands which are attributable to Fe2+ spin-forbidden crystal field transitions. Fe2+-Fe3+ intervalence charge transfer absorption bands near 0.77 μm are common in terrestrial pyroxenes which contain both ferrous and ferric iron. Collectively, these results indicate that the presence of various transition series elements can be detected in reflectance spectra and that their oxidation states and site occupancies can also be determined on the basis of unique spectral characteristics present in their reflectance spectra, thereby greatly increasing the range of compositional information which can be derived from analysis of their reflectance spectra.
dc.description.sponsorship This study was supported by grants-in-aid of research from the Natural Sciences and Engineering Research Council of Canada (NSERC), Sigma Xi, The Scientific Research Society, the Geological Society of America, a research contract from the Canadian Space Agency, and a start-up grant from the University of Winnipeg.
dc.description.sponsorship This study was supported by grants-in-aid of research from the Natural Sciences and Engineering Research Council of Canada (NSERC), Sigma Xi, The Scientific Research Society, the Geological Society of America, a research contract from the Canadian Space Agency, and a start-up grant from the University of Winnipeg.
dc.description.uri https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2001JE001590
dc.language.iso en en_US
dc.publisher Journal of Geophysical Research en_US
dc.subject pyroxene en_US
dc.subject reflectance spectroscopy
dc.subject transition series elements
dc.subject asteroids
dc.title Pyroxene reflectance spectra: Minor absorption bands and effects of elemental substitutions en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2001JE001590


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