Mineral Analysis of Martian Dunes

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Presentation transcript:

Mineral Analysis of Martian Dunes By Savannah Bachman Mentor: Dr. Timothy Titus Universe and planets

Minerals on Dunes I used thermal infrared observations to determine mineral compositions of six dune fields and their surroundings. Based off composition of sediment found in the dune and the surroundings, I tested the hypothesis that the sediment came from a localized source.

Outline Thermal emissions and how to interpret the spectra Processes used to collect data JMARS TES Speclib Analysis DaVinci Mineral composition comparisons Conclusion

How Spectra works Wavelength µm Emissivity Wavenumber cm-1 Emits thermal radiance Sun TES Rock Radiates heat Stores heat energy Collects mineral spectrum Wavelength µm Emissivity Anorthoclase • Olivine Fo35• Wavenumber cm-1

Mineral Spectral Library For this Study Individual spectra for minerals found on Mars

Java Mission-Planning and Analysis for Remote Sensing 180° 0° -180° 60° 0° -60° USGS Dune Database Dune Selection 6 dunes total Large dunes Within equatorial region Thermal Emission Spectrometer (TES) spectra

JMARS&TES Dune ID: 3124-080 Located: (311.625 E, -7.875) Off the Dune: North JMARS&TES CO2 Dune ID: 3124-080 On Dune Off Dune: South Located: (311.625 E, -7.875)

DaVinci

Mineral Composition Comparison On the Dune Off the Dune North Off the Dune South Olivine Fo35 36.01 38.85 36.21 Microcline 18.7 19.93 18.53 Anorthoclase 12.26 13.11 11.91 Andesine 11.92 8.91 10.97 Diopside 10.68 7.14 12.59 Enstatite 7.4 8.36 7.24 Quartz 2.95 3.7

Analysis of Mineral Abundance Three dune fields contain almost no variance in mineral abundance from their surroundings Two dune fields contain different amounts of olivine and anorthoclase One dune field contains different amounts of anorthoclase

Local

Conclusion Four dune fields have similar mineral amounts to their surroundings which is indicative of a local sediment source Two dune fields have different mineral amounts when compared to their surroundings which may suggest a non-localized source

Acknowledgments Thank you. Dr. Timothy Titus Chris Edwards, ASU Christopher Mount, NAU Rose Hayward ASU NASA Space Grant Thank you.