Seelos, Kimberly D. and Arvidson, Raymond E. and Jolliff, Bradley L. and Chemtob, Steven M. and Morris, Richard V. and Ming, Douglas W. and Swayze, Gregg A. (2010) Silica in a Mars analog environment: Ka'u Desert, Kilauea Volcano, Hawaii. Journal of Geophysical Research E, 115 . Art. No. E00D15. ISSN 0148-0227 http://resolver.caltech.edu/CaltechAUTHORS:20100526-105639064
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Airborne Visible/Near-Infrared Imaging Spectrometer (AVIRIS) data acquired over the Ka'u Desert are atmospherically corrected to ground reflectance and used to identify the mineralogic components of relatively young basaltic materials, including 250–700 and 200–400 year old lava flows, 1971 and 1974 flows, ash deposits, and solfatara incrustations. To provide context, a geologic surface units map is constructed, verified with field observations, and supported by laboratory analyses. AVIRIS spectral end-members are identified in the visible (0.4 to 1.2 μm) and short wave infrared (2.0 to 2.5 μm) wavelength ranges. Nearly all the spectral variability is controlled by the presence of ferrous and ferric iron in such minerals as pyroxene, olivine, hematite, goethite, and poorly crystalline iron oxides or glass. A broad, nearly ubiquitous absorption feature centered at 2.25 μm is attributed to opaline (amorphous, hydrated) silica and is found to correlate spatially with mapped geologic surface units. Laboratory analyses show the silica to be consistently present as a deposited phase, including incrustations downwind from solfatara vents, cementing agent for ash duricrusts, and thin coatings on the youngest lava flow surfaces. A second, Ti-rich upper coating on young flows also influences spectral behavior. This study demonstrates that secondary silica is mobile in the Ka'u Desert on a variety of time scales and spatial domains. The investigation from remote, field, and laboratory perspectives also mimics exploration of Mars using orbital and landed missions, with important implications for spectral characterization of coated basalts and formation of opaline silica in arid, acidic alteration environments.
|Additional Information:||© 2010 American Geophysical Union. Received 29 January 2009; revised 10 October 2009; accepted 19 October 2009; published 8 April 2010. We are grateful to Alian Wang for her expertise and use of the Raman spectroscopy lab at Washington University. This work benefited from constructive review from Janice Bishop and an anonymous reviewer. Support provided by the NASA Planetary Geology and Geophysics Program by a grant to Washington University and the NASA Mars Reconnaissance Orbiter project.|
|Subject Keywords:||Mars analog; silica; AVIRIS|
|Official Citation:||Seelos, K. D., R. E. Arvidson, B. L. Jolliff, S. M. Chemtob, R. V. Morris, D. W. Ming, and G. A. Swayze (2010), Silica in a Mars analog environment: Ka'u Desert, Kilauea Volcano, Hawaii, J. Geophys. Res., 115, E00D15, doi:10.1029/2009JE003347.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||23 Jun 2010 18:41|
|Last Modified:||26 Dec 2012 12:04|
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