Physics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgre..108.8097w&link_type=abstract
Journal of Geophysical Research, Volume 108, Issue E12, pp. ROV 38-1, CiteID 8097, DOI 10.1029/2003JE002071
Physics
4
Geochemistry: Instruments And Techniques, Geochemistry: Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), Geochemistry: Chemical Evolution, Mineralogy And Petrology: Planetary Mineralogy And Petrology
Scientific paper
Deployment by the Mars Exploration Rovers of backscatter Mössbauer spectrometers offers an incredible opportunity to (1) elucidate the iron mineralogies of rocks, soils, and atmospheric dust and (2) gain insight into the physical event by which the mineralogy came into existence and consequently acquire information having potential for yielding ancient planetary history relevant to broad issues including the question of life. Determining the mineralogy is done by subjecting raw data to reduction algorithms and generating products known as Mössbauer parameters, which are highly characteristic. Mixed mineralogies are treated through deconvolution. Through being able to exploit Mössbauer measurements made at different temperatures during the Martian diurnal variation, and utilizing spectra obtained of the same sample with both the 6.4 and 14.4 keV energy channels, characteristics beyond oxidation state and stoichiometry are accessible. These include temperature sensitive magnetic transitions that can be either abrupt or gradual, variation of Mössbauer parameters with temperature, and variation of composition with depth, all of which can be dependent upon past processing affecting initial crystallization or subsequent alteration (``weathering''). The goal is to arrive at an understanding of environments including the very ancient.
Klingelhofer Göstar
Nuñez Jorge I.
Wade Manson Lashawn
Wdowiak Thomas J.
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