Visible, near-infrared, and middle infrared spectroscopy of altered basaltic tephras: Spectral signatures of phyllosilicates, sulfates, and other aqueous alteration products with application to the mineralogy of the Columbia Hills of Gusev Crater, Mars

We studied visible to near‐infrared (VNIR, 0.35–2.5 μm) and middle infrared (MIR, 1800–250 cm−1, also called thermal infrared and vibrational) spectra of basaltic tephras from Mauna Kea volcano that were altered under ambient, hydrothermal (hydrolytic and acid sulfate), and dry heat conditions. Alth...

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Bibliographic Details
Published in:Journal of Geophysical Research. E. Planets 2008-12, Vol.113 (E12), p.n/a
Main Authors: Hamilton, Victoria E., Morris, Richard V., Gruener, John E., Mertzman, Stanley A.
Format: Article
Language:English
Subjects:
alteration
Mars
spectroscopy
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Summary:We studied visible to near‐infrared (VNIR, 0.35–2.5 μm) and middle infrared (MIR, 1800–250 cm−1, also called thermal infrared and vibrational) spectra of basaltic tephras from Mauna Kea volcano that were altered under ambient, hydrothermal (hydrolytic and acid sulfate), and dry heat conditions. Although models of MIR spectra of altered tephras generally produce fits whose quality is reduced compared to deconvolutions of primary lithologies, they successfully identify major alteration phases (cristobalite, oxide, phyllosilicate, and sulfate) except in palagonites. MIR spectra of the 1% in spectra of the 500–1000 μm fraction only if phyllosilicates are present. Although Mauna Kea palagonitic tephra is considered a VNIR analog to Martian dust, comparison of MIR altered tephra spectra (
ISSN:0148-0227
2156-2202
DOI:10.1029/2007JE003049