Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p33c..06j&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P33C-06
Other
3934 Optical, Infrared, And Raman Spectroscopy, 5410 Composition (1060, 3672), 5460 Physical Properties Of Materials, 5464 Remote Sensing, 6225 Mars
Scientific paper
Visible/near-infrared color variations across the surface of the Home Plate (HP) structure were first observed by the Spirit Pancam multispectral camera using images acquired from the top of Husband Hill on sol 595, ~700m away from HP. Orbital imaging by the HiRISE camera on sol 1325 showed consistent color trends with Pancam in which the western edge of HP was "redder" than the "bluer" eastern portion. This suggested the eastern rim materials of HP are not as contaminated by airfall dust and/or are less oxidized. Pancam spectra of brushed rock targets indicate that western dust-free rock surfaces have higher 535nm band depths (consistent with higher Fe3+/Fe measured by the Mossbauer spectrometer), potentially caused by finely crystalline red hematite. The western rocks also exhibited less negative 601nm band depths than in the east, which could result from lower pyroxene/olivine ratios or the presence of goethite. The spectral variations across HP combined with in situ geochemical data around the rim suggest that the volcanic and/or hydrothermal nature of the HP system resulted in localized, high temperature events on the eastern side, compared to lower temperature alteration on the western side that produced greater amounts of nanophase ferric oxides. This hypothesis is being investigated using 13 band scenes acquired from Spirit's winter location on the northern rim of HP. Pancam began imaging on sol 1477 as part of an extensive mosaic (the "Bonestell Panorama"). Preliminary analyses confirm higher red/blue ratios along the western rim, but also redder regions on the eastern rim not as obvious in Sol 595 images. HiRISE acquired a color image of HP on Sol 1591 that shows less color variability on HP than the sol 1325 image. Dust fallout from the 2007 dust storm (sols 1240 to 1330) may be the cause of these temporal color variations. Additional analysis is required to determine whether surficial dust deposits are the dominant cause of the original color dichotomy on HP.
Bell Jon F.
Farrand William H.
Herkenhoff Ken E.
Johnson Jay Robert
Rice Melissa S.
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