Mathematics – Logic
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p72a0482m&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P72A-0482
Mathematics
Logic
5415 Erosion And Weathering, 5464 Remote Sensing, 6225 Mars
Scientific paper
Palagonitiztion has been suggested as an import surface weathering process on Mars based on comparisons of spacecraft and telescopic remote sensing and laboratory data for phyllosilicate-poor palagonitic tephra. Palagonite (a poorly ordered material) is found in close association with products of local hydrothermal alteration in the summit region of Mauna Kea Volcano (Hawaii). We are investigating the mineralogical and chemical composition of these basaltic hydrothermal alteration products as a guide to specific hydrothermal alteration products that might be present on Mars. Using a variety of analytical techniques (including reflectance and Moessbauer spectroscopy, major element analysis, and X-ray diffraction), we have identified and characterized the spectra signatures of hematite, kaolinite, smectite, jarosite, and alunite as well-crystalline hydrothermal alteration products. The close spatial association of both poorly-crystalline palagonite and well-crystalline hydrothermal minerals on Mauna Kea, AVIRIS (Airborne Visible and Infrared Imaging Spectrometer) coverage of the same area, and the ground-truth laboratory data provide a way to quantify the remote-sensing detectability of hydrothermal alteration products in the presence of unaltered and other altered materials. The AVIRIS observations of Mauna Kea are a good analogue for CRISM (Compact Reconnaissance Imaging Spectrometer for Mars) measurements of Mars because both are visible-infrared hyperspectral mapping instruments. CRISM measurements are part of the Mars Reconnaisance Orbitor 2005 mission.
Arvidson Ray E.
Bell Jon F.
Graff Trevor G.
Guinness Edward A.
Jolliff Brad L.
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