Table 1

VSWIR determined mineralogy of all of the bulk-rock samples in order of increasing alteration determined by visual analysis (amount of red material on surface) and overall continuum shape; italicized entries are subset used for further study

SampleDescriptionOverall continuumFerric absorptions (μm)Vibrational Absorptions (μm)VSWIR-determined mineralogy
SanC-Jlarge dark gray basaltflat, constant slopesmall 1.41; small, broad 2.21; small 2.31hydrous Si + Fe/Mg clay
SanC-Klarge mottled gray/light gray basaltflat, constant slopesmall 1.41; broad 2.21hydrous Si
SanC-Fsmall gray basalt, white coatingdownward slope1.50; doublet at 1.95 and 2.04; 2.21gypsum coating
SanC-Clarge dark brown/rust basaltcurved, concave down0.5, 0.53, pos. UV-Vis slope, 0.89–0.991.41; sharp and broad 2.21hydrous Si + Al-smectite + Fe3+-ox
SanC-Bmassive gray/brown basaltdownward slope0.5, pos. UV-Vis slope, 0.97sharp 1.42, broad 2.21, 2.29–2.32hydrous Si + Mg clay + Fe3+ oxide
SanC-Ilarge gray/rust-colored basaltdownward slopesharp 0.53 band1.41; 2.21 bandsAl-smectite + Fe3+ oxide
SanC-Alarge basaltic rock, rust coloredcurved, concave down0.5, 0.53, pos. UV-Vis slope, 0.91sharp 1.41 and 2.21 bandsAl-smectite + Fe3+ oxide
  • Notes: Note that all samples have 1.9 μm vibrational absorptions, so these are not listed.