feldspar distribution in dune fields on mars heather charles dr. timothy n. titus (mentor) northern...
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Feldspar Distribution in Dune Fields on Mars
Heather CharlesDr. Timothy N. Titus (Mentor)
Northern Arizona University/USGS Astrogeology
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Why Study Dunes on Mars?
• Aeolian environment• Interface between atmosphere
and surface• Geological history
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Identifying Minerals on Mars’ Surface
• Emissivity: measure of infrared energy emitted
• Different emissivities = different minerals
• Mars Global Surveyor mission
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• Dune Field 2938-497: Identifying minerals present
• Subject of previous study
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Hypothesis
Feldspar is present in dune field 2938-497 but is non-uniform.
Previous study suggested feldspar either absent or non-uniform.
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Data• JMARS – emissivity
data• Orbital tracks in
dune field selected• Spectral library• Davinci
deconvolution• Mineral abundance
percentages
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Analysis
• Mineral abundance v. longitude• Trends from west to east• Compared trends from two analyses
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Conclusions
• Worse results without feldspar• Change in abundance across field• Feldspar present and non-uniform
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Acknowledgements
• Dr. Tim Titus, mentor• Rose Hayward• Chris Edwards• NAU and the Space Grant Program
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Any Questions?
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Davinci Deconvolution
• Atmospheric correction file • Removed dust, aerosols• Ran data through twice• Spectral mineral library• 8 mineral groups, 44 endmembers
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THEMIS
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CRISM - Olivine