Evidence for pigmentary hematite on Mars based on optical, magnetic, and Moessbauer studies of superparamagnetic (nanocrystalline) hematite

Details Evidence for pigmentary hematite on Mars based on optical, magnetic, and Moessbauer studies of superparamagnetic (nanocrystalline) hematite Evidence for pigmentary hematite on Mars based on optical, magnetic, and Moessbauer studies of superparamagnetic (nanocrystalline) hematite

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.2760m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, March 10, 1989, p. 2760-2778.

Mathematics

Logic

149

Hematite, Mars Surface Samples, Mineralogy, Magnetic Properties, Mossbauer Effect, Optical Measurement, Paramagnetism, Mars, Hematite, Optical Properties, Magnetic Properties, Particles, Xrd, Spectroscopy, Laboratory Studies, Iron, Concentration, X-Ray Methods, Analogs, Spectra, Oxides, Procedure, Thermal Effects, Parameters, Ultraviolet, Wavelengths, Absorption, Size

Scientific paper

Samples containing variable amounts of superparamagnetic hematite (sp-Hm) were prepared by a method in which the sp-Hm particles were dispersed throughout larger particles of silica gel, and the optical and magnetic properties of these samples were compared with those of larger-diameter hematite (bulk-Hm). It is shown that the optical properties of sp-Hm are different from those of bulk-Hm. Implications of the results for mineralogical interpretations of spectral data for the Martian surface and its terrestrial analogues are discussed. It is concluded that features resulting from ferric iron in the Martian spectral data and the results of the Viking magnetic properties experiment are both consistent with hematite present as both sp-Hm and bulk-Hm; the hematite particles most likely occur in pigmentary form, i.e., as particles dispersed throughout the volume of a spectrally neutral material.

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