Rogers, A. D. and Aharonson, O. (2008) Mineralogical composition of sands in Meridiani Planum determined from Mars Exploration Rover data and comparison to orbital measurements. Journal of Geophysical Research E, 113 (E6). E06S14. ISSN 0148-0227 http://resolver.caltech.edu/CaltechAUTHORS:ROGjgre08
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Constraints on the mineralogical composition of low-albedo, low-sulfur sands at Meridiani Planum are determined from Mars Exploration Rover (MER) Opportunity Miniature Thermal Emission Spectrometer (Mini-TES), Mossbauer, and Alpha Proton X-Ray Spectrometer measurements. Results of this work show that the sand is olivine basaltic in composition, with minor amounts of sulfate and a high-silica phase (glass or secondary amorphous silica). Measurements from all three instruments indicate that pyroxene is twice as abundant as olivine, and that the pyroxene composition is dominated by the low-calcium variety. The volume abundance of olivine is constrained to be 10-15%. Results from detailed analyses of MER data are used to ground truth the spectral emissivity and mineral abundances derived from orbit with Mars Global Surveyor TES data. TES-derived mineral abundances are within 5% of those derived from MER data, which is generally within the statistical errors associated with TES-derived phase abundances. The agreement lends support to global- and regional-scale variations in mineralogical composition determined from TES data in previous studies. An alternative method of least squares minimization is used for modeling the TES and Mini-TES data; the benefits of this method are demonstrated by comparison with conventional least squares techniques previously used by TES data users.
|Additional Information:||© 2008 American Geophysical Union. Received 22 August 2007; revised 16 January 2008; accepted 26 February 2008; published 6 May 2008. We are grateful for discussions and comments provided by Jeffrey Johnson, Albert Yen, and Timothy Glotch. Kimberly Murray (ne´e Feely) graciously provided the rock spectra and petrographic abundances from Feely and Christensen . Formal reviews from Steven Ruff and Karen Stockstill-Cahill greatly improved and clarified this manuscript. We appreciate the outstanding efforts of the scientists and engineers involved in development and operation of the MER mission and Mini-TES instruments. This work was partially supported by the NASA Mars Data Analysis Program (grant NNX06AD94G) and the Mars Exploration Rover Participating Scientist program.|
|Subject Keywords:||thermal emission spectrometer; Martian surface; Mossbauer spectrometer; infrared-spectroscopy; opportunity rover; Terra-Meridiani; MIMOS-II; TES; terrestrial; chemistry|
|Official Citation:||Rogers, A. D., and O. Aharonson (2008), Mineralogical composition of sands in Meridiani Planum determined from Mars Exploration Rover data and comparison to orbital measurements, J. Geophys. Res., 113, E06S14, doi:10.1029/2007JE002995.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||10 Aug 2009 15:48|
|Last Modified:||26 Dec 2012 10:51|
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