Exploring Variability in Acidic Saline Playa Lakes in WA with HyMAP Hyperspectral Data

Details Exploring Variability in Acidic Saline Playa Lakes in WA with HyMAP Hyperspectral Data Exploring Variability in Acidic Saline Playa Lakes in WA with HyMAP Hyperspectral Data

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p23a1235b&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P23A-1235

Mathematics

Logic

[3672] Mineralogy And Petrology / Planetary Mineralogy And Petrology, [5464] Planetary Sciences: Solid Surface Planets / Remote Sensing, [6225] Planetary Sciences: Solar System Objects / Mars

Scientific paper

Acid saline lakes in Western Australia have been recognized as useful chemical terrestrial analogs for aqueous mineral formation on Mars [e.g., 1]. In these lake systems, large pH and salinity differences are observed both laterally and vertically over scales of a few tens of meters[2, 3]. The variability in these lakes have been offered as an alternate formation mechanism for some of the phyllosilicates and sulfates on Mars, suggesting that these different mineral types may be separated by chemical gradients rather than by temporal boundaries[4]. To assess the ability to detect this variability remotely and to determine the extent of the surface variability, which may not be easily accessible in the field, spectral mapping for two of the acidic saline playa lakes was performed. HyMAP airborne data were acquired in December, 2008, of Lake Gilmore and Lake Chandler in WA. The HyMAP sensors have 126 bands that cover the wavelength range between 0.45 and 2.5 µm. Hyvista Corporation provided atmospherically corrected surface reflectance data at approximately 3m spatial resolution. Using the methodology described by [5] the HyMAP data were analyzed using ENVI to identify spectrally pure endmembers that can be used to distinguish mineralogy in the scene. Relevant (e.g. not roads, water or vegetation) spectral endmembers derived for each scene were identified visually using spectra from the ASTER spectral library[6]. The processing techniques were applied to all flight lines and ultimately a classification map mosaic was produced for selection of relevant and intriguing field sampling sites. The classification maps will be validated using field spectroscopy and visual inspection of representative samples collected from the field sites in October 2009, and laboratory spectroscopy and X-ray diffraction will be performed for further validation. The classification maps confirm variability in mineralogy across the lakes, validating geochemical modeling. There are also some unexpected intriguing results. For example, dune forms reveal interbedded sulfates and clays. These deposits may be indicative of the ephemeral nature of the lakes and are of particular interest to studies of similar martian deposits such as those in Gale Crater[7] and Columbus Crater[8]. The acid saline lakes in Australia therefore may provide an even more compelling analog to aqueous deposition on Mars. 1. K. C. Benison, D. A. LaClair, Astrobiology 3, 609 (November 1, 2003). 2. G. M. Marion et al., Geochimica Et Cosmochimica Acta 73, 3493 (June 1, 2009). 3. B. B. Bowen, K. C. Benison, Applied Geochemistry 24, 268 (2009). 4. A. Baldridge et al., Geophysical Research Letters (Accepted Manuscript, In Press). 5. J. W. Boardman, F. A. Kruse, paper presented at the Proceedings, Tenth Thematic Conference, Geologic Remote Sensing, San Antonio, TX, May 9-12, 1994. 6. A. M. Baldridge, S. J. Hook, C. I. Grove, G. Rivera, Remote Sensing of Environment 113, 711 (2009). 7. R. E. Milliken et al., paper presented at the Lunar and Planetary Institute Science Conference Abstracts, March 1, 2009. 8. J. J. Wray et al., paper presented at the Lunar and Planetary Institute Science Conference Abstracts, March 1, 2009.

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