Magnetic Properties Experiments on the Mars Pathfinder Lander: Preliminary Results

Science  05 Dec 1997:
Vol. 278, Issue 5344, pp. 1768-1770
DOI: 10.1126/science.278.5344.1768

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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 (γ-Fe2O3). The presence of the γ 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.

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