Oxidation of basaltic tephras: Influence on reflectance in the 1 micron region

Details Oxidation of basaltic tephras: Influence on reflectance in the 1 micron region Oxidation of basaltic tephras: Influence on reflectance in the 1 micron region

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..238f&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 238-239 (SEE N92-10728 01-91)

Physics

Geophysics

Basalt, Coatings, Continuums, Iron, Lunar Surface, Mars Surface, Oxidation, Planetary Geology, Reflectance, Slopes, Spectra, Ultraviolet Absorption, Volcanoes, Volcanology, Analogies, Corners, Crystallinity, Depth, Deserts, Mars (Planet), Mexico, Moon, Oxides, Utah

Scientific paper

As part of a ongoing study into the products of hydrovolcanism, tuffs were examined from the Cerro Colorado and Pavant Butte tuff cones. The former resides in the northeastern corner of the Pinacate Volcanic Field in Sonara, Mexico and the latter is in the Black Rock Desert of southern Utah. Numerous samples were collected and many of these had their Vis/IR reflectance measured. It seems likely that in the palagonite tuffs there is a combination of nanocrystalline ferric oxide phases contributing to the UV absorption edge, but not to the 1 micron band, plus more crystalline ferric oxides which do contribute to that band as well as ferrous iron within unaltered sideromelane which is skewing the band center to longer wavelengths. This work has implications for the study of Mars. The present work indicates that when ferrous and ferric iron phases are both present, their combined spectral contribution is a single band in the vicinity of 1 micron. The center, depth, and width of that feature has potential to be used to gauge the relative proportions of ferrous and ferric iron phases.

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