Spectral signature of oxidized pyroxenes - Implications to remote sensing of terrestrial planets

Details Spectral signature of oxidized pyroxenes - Implications to remote sensing of terrestrial planets Spectral signature of oxidized pyroxenes - Implications to remote sensing of terrestrial planets

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9618819s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Oct. 25, 1991, p. 18,819-18,830.

Physics

10

Near Infrared Radiation, Oxidation, Pyroxenes, Remote Sensing, Spectral Reflectance, Terrestrial Planets, Amorphous Materials, Crystal Structure, Hematite, Iron Oxides, Mossbauer Effect, Silicates

Scientific paper

The effect of the structural Fe(3+) or disseminated ferric oxides in oxidized ferromagnesian silicates on the reflectance spectral profiles of the remnant Fe(2+) ions in oxidized silicates was investigated. Results of spectral measurements in the visible NIR region, performed on several well-characterized pyroxenes representative of different structural types and compositions, were correlated with data obtained from the Mossbauer spectra of the oxidation products. The measurements made it possible to determine the relative proportions of Fe(2+) and Fe(3+) ions present in the oxidized pyroxenes and provided information on the amorphous ferric oxide phases present in the oxidation products. The results also suggest a mechanism for producing the nanophase hematite popularly considered to be responsible for the features observed around 0.62 and 0.87 micron in the remotely sensed spectra of Mars.

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