Milliken, R. E. and Swayze, G. A. and Arvidson, R. E. and Bishop, J. L. and Clark, R. N. and Ehlmann, B. L. and Green, R. O. and Grotzinger, J. P. and Morris, R. V. and Murchie, S. L. and Mustard, J. F. and Weitz, C. (2008) Opaline silica in young deposits on Mars. Geology, 36 (11). pp. 847-850. ISSN 0091-7613 http://resolver.caltech.edu/CaltechAUTHORS:MILg08
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High spatial and spectral resolution reflectance data acquired by the Mars Reconnaissance Orbiter Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) instrument reveal the presence of H_2O- and SiOH-bearing phases on the Martian surface. The spectra are most consistent with opaline silica and glass altered to various degrees, confirming predictions based on geochernicall experiments and models that amorphous silica should be a common weathering product of the basaltic Martian crust. These materials are associated with hydrated Fe sulfates, including H_3O-bearing jarosite, and are found in finely stratified deposits exposed on the floor of and on the plains surrounding the Valles Marineris canyon system. Stratigraphic relationships place the formation age of these deposits in the late Hesperian or possibly the Amazonian, implying that aqueous alteration continued to be an important and regionally extensive process on Mars during that time.
|Additional Information:||© 2008 Geological Society of America. Manuscript received 26 March 2008. Revised manuscript received 17 July 2008. Manuscript accepted 19 July 2008. We thank François Poulet and an anonymous reviewer for comments that helped improve this manuscript. The research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.|
|Subject Keywords:||MERIDIANI-PLANUM; VALLES MARINERIS; JAROSITE; WATER; DIVERSITY; MINERALS; GLASSES; HISTORY|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||10 Jul 2009 20:34|
|Last Modified:||26 Dec 2012 10:51|
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