Ferric iron in primitive asteroids - A 0.43-micron absorption feature

Details Ferric iron in primitive asteroids - A 0.43-micron absorption feature Ferric iron in primitive asteroids - A 0.43-micron absorption feature

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..102..225v&link_type=abstract

Icarus (ISSN 0019-1035), vol. 102, no. 2, p. 225-231.

Computer Science

42

Absorption Spectra, Asteroids, Forbidden Transitions, Iron Compounds, Planetary Composition, Porphyrins, Silicates, Solar System Evolution, Water, Asteroids, Iron, Abundance, Composition, Absorption, Visible Light, Wavelength, Ultraviolet, Spectra, Classification, Minerals, Origin, Formation, Aqueous Alteration, Phyllosilicates, Data Reduction, Catalog, Reflectance, Analysis

Scientific paper

A search of reflectance spectra of C- P-, D- and S-class asteroids to hunt for the Soret band near 0.4 micron that is indicative of porphyrins yielded an identification of an 0.43 micron absorption feature in 11 primitive asteroids of the C, P, and G classes and in one S-class asteroid. It is proposed that the feature is an Fe(3+) spin-forbidden transition in aqueously altered material, possibly located near 0.43 micron due to an enhancement effect similar to the mechanism operating in jarosite. The significance of the feature for the aqueous alteration history of these asteroids is addressed.

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