And Glaciovolcanic Basaltic Tuffs: Modes of Alteration and Relevance for Mars
Icarus 309 (2018) 241–259 Contents lists available at ScienceDirect Icarus journal homepage: www.elsevier.com/locate/icarus Spectroscopic examinations of hydro- and glaciovolcanic basaltic tuffs: Modes of alteration and relevance for Mars ∗ W.H. Farrand a, , S.P. Wright b, T.D. Glotch c, C. Schröder d, E.C. Sklute e, M.D. Dyar e a Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA b Planetary Science Institute, 1700 East Ft. Lowell, Suite 106, Tucson, AZ 85719, USA c Department of Geosciences, Stony Brook University, 255 Earth and Space Sciences Building, Stony Brook, NY 11794, USA d Department of Biological and Environmental Sciences, University of Stirling, FK9 4LA Scotland, UK e Department of Astronomy, Mount Holyoke College, 206 Kendade, South Hadley, MA 01075, USA a r t i c l e i n f o a b s t r a c t Article history: Hydro- and glaciovolcanism are processes that have taken place on both Earth and Mars. The amount Received 14 July 2017 of materials produced by these processes that are present in the martian surface layer is unknown, but Revised 22 December 2017 may be substantial. We have used Mars rover analogue analysis techniques to examine altered tuff sam- Accepted 8 March 2018 ples collected from multiple hydrovolcanic features, tuff rings and tuff cones, in the American west and Available online 10 March 2018 from glaciovolcanic hyaloclastite ridges in Washington state and in Iceland. Analysis methods include Keywords: VNIR-SWIR reflectance, MWIR thermal emissivity, thin section petrography, XRD, XRF, and Mössbauer Mars, surface spectroscopy.
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