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Science 5 December 1997:
Vol. 278. no. 5344, pp. 1768 - 1770
DOI: 10.1126/science.278.5344.1768
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Reports
Magnetic Properties Experiments on the Mars Pathfinder Lander: Preliminary Results
S. F. Hviid,
M. B. Madsen,
H. P. Gunnlaugsson,
W. Goetz,
J. M. Knudsen,
R. B. Hargraves,
P. Smith,
D. Britt,
A. R. Dinesen,
C. T. Mogensen,
M. Olsen,
C. T. Pedersen,
L. Vistisen
Many of the particles currently suspended in the martian
atmosphere are magnetic, with an average saturation magnetization of
about 4 A·m2/kg (amperes times square meters per
kilogram). The particles appear to consist of claylike aggregates
stained or cemented with ferric oxide (Fe2O3);
at least some of the stain and cement is probably maghemite
( -Fe2O3). The presence of the phase
would imply that Fe2+ ions leached from the bedrock,
passing through a state as free Fe2+ ions dissolved in
liquid water. These particles could be a freeze-dried precipitate from
ground water poured out on the surface. An alternative is that the
magnetic particles are titanomagnetite occurring in palagonite and
inherited directly from a basaltic precursor.
S. F. Hviid, M. B. Madsen, H. P. Gunnlaugsson, W. Goetz, J. M. Knudsen, A. R. Dinesen, C. T. Mogensen, M. Olsen, C. T. Pedersen, L. Vistisen, Oersted
Laboratory, Niels Bohr Institute for Astronomy, Physics, and
Geophysics, University of Copenhagen, Copenhagen, Denmark.
R. B. Hargraves, Department of Geosciences, Princeton University,
Princeton, NJ 08544, USA.
P. Smith and D. Britt, Lunar and Planetary Laboratory, University of
Arizona, Tucson, AZ 85721, USA.
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