Variable Olivine Detection in Soils at Meridiani Planum From Mars Express OMEGA and MER Opportunity Observations

Details Variable Olivine Detection in Soils at Meridiani Planum From Mars Express OMEGA and MER Opportunity Observations Variable Olivine Detection in Soils at Meridiani Planum From Mars Express OMEGA and MER Opportunity Observations

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p31a..05w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P31A-05

Other

5464 Remote Sensing, 5470 Surface Materials And Properties

Scientific paper

The Meridiani plains have been characterized spectrally using data collected on the ground by the Opportunity rover and from orbit by the Mars Express OMEGA instrument. Observations completed by the Opportunity rover show that the Meridiani plains are covered by aeolian deposits composed of basaltic sands, gray hematite spherules, and variable amounts of bright dust. Measurements made by the Mössbauer spectrometer (14.4keV) of the deposits imply subequal concentrations of iron contained in both olivine and pyroxene [Klingelhöfer et al., 2004] whereas Mini-TES (5-29μm) detects a higher abundance of pyroxene relative to olivine [Christensen et al., 2004]. Distinct spectral features attributable to olivine or pyroxene in the ~0.4-1μm range are not detectable in Pancam data [Bell et al., 2004]. Spectral reflectance data from OMEGA (in the ~0.92-2.69μm range) covering the Opportunity rover traverse regions show evidence for the presence of pyroxene but not olivine, although olivine has been detected several kilometers to the south [Arvidson et al., 2006]. The apparent discrepancy in the concentration of olivine detected by the various instruments at Meridiani suggests that olivine is masked by the presence of other phases in the VNIR.

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