Thermally altered palagonitic tephra - A spectral and process analog to the soil and dust of Mars

Details Thermally altered palagonitic tephra - A spectral and process analog to the soil and dust of Mars Thermally altered palagonitic tephra - A spectral and process analog to the soil and dust of Mars

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3373b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E2, p. 3373-3385.

Physics

60

Dust, Lava, Mars Surface, Mineralogy, Planetary Geology, Soils, Geochemistry, Spectral Reflectance, Mars, Thermal Effects, Tephra, Analogs, Soil, Dust, Heating, Xrd, Samples, Terrestrial, Spectroscopy, Weathering, Visible Light, Lava, Near-Infrared, Wavelengths, Magnetic Properties, Description, Spectra, Reflectivity, Comparisons, Palagonites, Absorption, Ferric Oxides, Particles, Size, Iron, Water, Concentration, X-Ray Methods, Origin, Laboratory Studies, Reflectance, Hematite, Magnetite, Formation, Altera

Scientific paper

Six palagonitic soil samples (PH-1 through PH-6) which were collected at 30-cm intervals from a lava slab on Mauna Kea, Hawaii, are studied. The samples present an alteration sequence caused by heating during emplacement of molten lava over a preexisting tephra cone. Techniques employed include visible and near-IUR spectroscopy, Moessbauer spectroscopy, and magnetic analysis. The four samples closest to the slab (PH-1 through PH-4) were strongly altered in response to heating during its emplacement; their iron oxide mineralogy is dominated by nanophase ferric oxide. The sample adjacent to the slab (PH-1) has a factor of 3 less H2O and contains crystalline hematite and magnetite in addition to nanophase ferric oxide. It is argued that localized thermal alteration events may provide a volumetrically important mechanism for the palagonitization of basaltic glass and the production of crystalline ferric oxides on Mars.

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