Mössbauer investigations of three meteorites of the type SNC-achondrites are reported. The results are compared with Mössbauer spectra of other meteorites, and selected terrestrial and lunar rocks. Through the oxidation state of iron in the pyroxenes and magnetic oxides studied, the work confirms that the mantle of the Earth is highly oxidized compared with the mantle of asteroidal bodies and lunar basalts. The investigations show that at least one of the SNC meteorites (Nakhla) comes from a highly oxidized parent body, believed to be the planet Mars. Based on the results obtained, a somewhat general conclusion about the oxidation state of iron in planetary bodies is proposed.
Mössbauer investigations of two achondrites, ALHA 77256 and Stannern, are reported. The results are compared to Mössbauer spectra of selected terrestrial and lunar rocks. The work confirms that the mantle of the Earth is highly oxidized compared to: (1) the mantle of the asteroidal bodies, which are believed to be the source of the meteorites called achondrites, and (2) the lunar basalts.A preliminary discussion of the significance of Mössbauer spectroscopy in the study of the evolution of planets is included.
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