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Feldspar Distribution in Dune Fields on Mars

Feldspar Distribution in Dune Fields on Mars. Heather Charles Dr. Timothy N. Titus (Mentor). Northern Arizona University/USGS Astrogeology. Why Study Dunes on Mars?. Aeolian environment Interface between atmosphere and surface Geological history. Identifying Minerals on Mars’ Surface.

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Feldspar Distribution in Dune Fields on Mars

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  1. Feldspar Distribution in Dune Fields on Mars Heather Charles Dr. Timothy N. Titus (Mentor) Northern Arizona University/USGS Astrogeology

  2. Why Study Dunes on Mars? • Aeolian environment • Interface between atmosphere and surface • Geological history

  3. Identifying Minerals on Mars’ Surface • Emissivity: measure of infrared energy emitted • Different emissivities = different minerals • Mars Global Surveyor mission

  4. Dune Field 2938-497: Identifying minerals present • Subject of previous study

  5. Hypothesis Feldspar is present in dune field 2938-497 but is non-uniform. Previous study suggested feldspar either absent or non-uniform.

  6. Data • JMARS – emissivity data • Orbital tracks in dune field selected • Spectral library • Davinci deconvolution • Mineral abundance percentages

  7. Analysis • Mineral abundance v. longitude • Trends from west to east • Compared trends from two analyses

  8. Conclusions • Worse results without feldspar • Change in abundance across field • Feldspar present and non-uniform

  9. Acknowledgements • Dr. Tim Titus, mentor • Rose Hayward • Chris Edwards • NAU and the Space Grant Program

  10. Any Questions?

  11. Davinci Deconvolution • Atmospheric correction file • Removed dust, aerosols • Ran data through twice • Spectral mineral library • 8 mineral groups, 44 endmembers

  12. THEMIS

  13. CRISM - Olivine

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