Pigmenting agents in Martian soils - Inferences from spectral, Moessbauer, and magnetic properties of nanophase and other iron oxides in Hawaiian palagonitic soil PN-9

Details Pigmenting agents in Martian soils - Inferences from spectral, Moessbauer, and magnetic properties of nanophase and other iron oxides in Hawaiian palagonitic soil PN-9 Pigmenting agents in Martian soils - Inferences from spectral, Moessbauer, and magnetic properties of nanophase and other iron oxides in Hawaiian palagonitic soil PN-9

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4597m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, p. 4597

Mathematics

Logic

48

Mars Surface, Iron Oxides, Spectral Reflectance, Magnetic Properties, Minerals, Pigments, Mossbauer Effect, Hawaii

Scientific paper

We have examined a Hawaiian palagonitic tephra sample (PN-9) that has spectroscopic similarities to Martian bright regions using a number of analytical techniques, including Moessbauer and reflectance spectroscopy, X-ray diffraction, instrumental neutron activation analysis, electron probe microanalysis, transmission electron microscopy, and dithionite-citrate-bicarbonate extraction. Chemically, PN-9 has a Hawaiitic composition with alkali (and presumably silica) loss resulting from leaching by meteoric water during palagonitization; no Ce anomaly is present in the REE pattern. Mineralogically, our results show that nanophase ferric oxide (np-Ox) particles (either nanophase hematite (np-Hm) or a mixture of ferrihydrite and np-Hm) are responsible for the distinctive ferric doublet and visible-wavelength ferric absorption edge. By analogy, np-Ox is likely the primary pigmenting agent of the bright soils and dust of Mars.

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