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

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Presentation transcript:

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 Emissivity: measure of infrared energy emitted Different emissivities = different minerals Mars Global Surveyor mission

Dune Field : Identifying minerals present Subject of previous study

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

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

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

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

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

Any Questions?

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

THEMIS

CRISM - Olivine