Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27r.244k&link_type=abstract
Meteoritics, vol. 27, no. 3, volume 27, page 244
Other
Scientific paper
The Viking landers on Mars were equipped to detect magnetic particles, and a remarkable finding was that the loose martian surface material (the martian "soil") adhered nearly equally well to both strong and weak magnets on board the landers (Hargraves et al., 1977). It was concluded that every particle making up the dust contained 1-7% of a strongly magnetic mineral. The nature of the magnetic mineral on Mars is not known with certainty. The SNC meteorites, believed to come from Mars, contain a ferrimagnetic phase (titanomagnetite). Magnetic fractions of the meteorites Nakhla and Zagami have been studied by Mossbauer spectroscopy. It will be shown that the titanomagnetite in Nakhla is different in composition--and perhaps structure--from the titanomagnetite in Zagami. The magnetic properties of the two meteorites, i.e., saturation magnetization, Neel point, etc., are thus very different. If SNC meteorites are indeed martian surface rocks, it seems reasonable to conclude that the surface basalts of Mars contain a magnetic phase. Thus a detailed study of the magnetic properties of SNC meteorites is of significance for the planning of a search for possible paleomagnetic signals in the surface rocks of Mars. Another aspect of the studies is the following: Could there be a direct connection between the magnetic phase in the martian soil and the magnetic properties of the underlying surface rocks? Or is the martian fines a result of precipitation in an ancient sea? Various terrestrial analogues will be discussed. In connection with the speculations presented above a brief description of Mossbauer spectrometer developed for the study of iron compounds on the surface of Mars will be included. A Mossbauer spectrometer is in the payload of the Russian rover mission to Mars planned for 1996 (Knudsen et al., 1991). References: Hargraves, R.B., Collinson, E.W.. Arvidson, R.E., and Spitzer, C.R. (1977) J. Geophys. Res. 82, 4547-4558. Knudsen, J.M., Madsen, M.B. Olsen, M. Vistisen, L., Koch, C.B., Morup, S., Kankeleit, E., Klingelhofer, G., Evlanov, E.N. Khromov, V.N., Mukhin, L.M., Prilutski, O.F., Zubkov, B., Smirnov, G.V. and Juchniewicz, J. (1991) Hyp. Int. 68, 83-94.
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