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UV, visible, and near-IR reflectivity data for magnetic soils/rocks from BrazilThe objective is to obtain UV, visible, and near-IR reflectivity spectra for several magnetic Brazilian soils/rocks and compare them to corresponding data for Mars to see if these materials satisfy both magnetic and spectral constraints for Mars. Selected physical properties of the magnetic Brazilian soils/rocks are presented. In general, the spectral features resulting from ferric crystal-field transitions are much better defined in the spectra of the magnetic Brazilian soils/rocks than in Martian spectral data. Presumably, this results from a relatively higher proportion of crystalline ferric oxides for the former. The apparent masking of the spectral signature of maghemite by hematite or goethite for the Brazilian samples implies the magnetic and spectral constraints for Mars can be decoupled. That is, maghemite may be present in magnetically-significant but optically-insignificant amounts compared to crystalline hematite.
Document ID
19920001036
Document Type
Conference Paper
Authors
Vempati, R. K. (Lockheed Engineering and Sciences Co. Houston, TX., United States)
Morris, R. V. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Lauer, H. V., Jr. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Coey, J. M. D. (Trinity Coll. Dublin, Ireland)
Date Acquired
September 6, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Program and Abstracts for Clay Minerals Society 28th Annual Meeting
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19920001030Analytic PrimaryProgram and Abstracts for Clay Minerals Society 28th Annual Meeting