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CRISM is a hyperspectral imager that operates from 0.362 to 1.053 mm (S data range) and 1.002 to 3.920 μm (L data range) (3).
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5
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84892935446
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note
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Matijevic Hill is named to honor the late Jacob R. Matijevic, one of the engineers most responsible for development of NASA Mars rovers, including Spirit and Opportunity.
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57Co radiation source. The mast-based Pancam camera and the arm-mounted Microscopic Imager (MI), Alpha Particle X-ray Spectrometer (APXS), and Rock Abrasion Tool (RAT) were all utilized in characterizing materials on Matijevic Hill. In addition, the mast-based navigation camera (Navcam) and body-mounted hazards camera (Hazcam) engineering cameras were used for contextual observations.
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84892929861
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note
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A sol is defined as one martian solar day.
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84892926456
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note
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Previous work with CRISM data acquired with the 18-m/pixel nominal resolution were used to infer the presence of diagnostic Fe-Mg smectite (mix of nontronite and saponite) spectral bands at 1.9, 2.3, and 2.4 m m on Cape Tribulation; a larger rim segment to the south of Cape York (9, 10); and hinted at their presence on Cape York (9). Additional analysis of the Cape York detection shows that it is associated with column-dependent noise and not a real detection.
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84892936778
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note
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+3 electronic transition absorptions centered at ∼0.43, 0.62, and 0.93 to 0.94 μm; an OH stretch overtone absorption at ∼1.4 μm; an OH stretch and H-O-H bending mode combination band at ∼1.9 μm; and OH stretch and Fe-OH bending mode combination bands at 2.28 and 2.39 mm (13). See (14) for an overview of clay mineral formation and (15) for initial discoveries on Mars.
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84892946766
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R. V. Morris et al. (16) show results from a series of dehydration experiments for nontronite in which the interlayer water was progressively removed. This greatly reduced the 1.4- and 1.9-μm bands, whereas the longer-wavelength Fe-OH combination bands remained largely unchanged.
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How much clay is on Mars? Lessons from visible/near-infrared (VNIR) and XRD study of hydrated silicate mineral assemblages in altered basalts from Iceland
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B. L. Ehlmann et al. (18) present RELAB-based spectral data for basaltic sand and basaltic sand mixed with varying weight percentages of clay-sized nontronite, together with a relation between band depth and amount of nontronite in the sample. Scaling from this relation indicates that the nontronite on Matijevic Hill occurs at only a few weight percent. RELAB data were acquired in a bidirectional mode with an incidence angle of 0° and an emission angle of 30°. Data are presented as spectral radiance coefficients, which are defined as the spectral radiance from the target divided by the spectral radiance for a perfectly reflecting Lambertian surface with both the target and standard illuminated at the same incidence angle.
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Localization and physical property experiments conducted by Spirit at Gusev Crater
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