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dc.contributor.authorFarrand, William Hen_UK
dc.contributor.authorWright, Shawn Pen_UK
dc.contributor.authorGlotch, Timothy Den_UK
dc.contributor.authorSchröder, Christianen_UK
dc.contributor.authorSklute, Elizabeth Cen_UK
dc.contributor.authorDyar, M Darbyen_UK
dc.description.abstractHydro- and glaciovolcanism are processes that have taken place on both Earth and Mars. The amount of materials produced by these processes that are present in the martian surface layer is unknown, but may be substantial. We have used Mars rover analogue analysis techniques to examine altered tuff samples collected from multiple hydrovolcanic features, tuff rings and tuff cones, in the American west and from glaciovolcanic hyaloclastite ridges in Washington state and in Iceland. Analysis methods include VNIR-SWIR reflectance, MWIR thermal emissivity, thin section petrography, XRD, XRF, and Mössbauer spectroscopy. We distinguish three main types of tuff that differ prominently in petrography and VNIR-SWIR reflectance: minimally altered sideromelane tuff, gray to brown colored smectite-bearing tuff, and highly palagonitized tuff. Differences are also observed between the tuffs associated with hydrovolcanic tuff rings and tuff cones and those forming glaciovolcanic hyaloclastite ridges. For the locations sampled, hydrovolcanic palagonite tuffs are more smectite and zeolite rich while the palagonitized hyaloclastites from the sampled sites are largely devoid of zeolites and relatively lacking in smectites as well. The gray to brown colored tuffs are only observed in the hydrovolcanic deposits and appear to represent a distinct alteration pathway, with formation of smectites without associated palagonite formation. This is attributed to lower temperatures and possibly longer time scale alteration. Altered hydro- or glaciovolcanic materials might be recognized on the surface of Mars with rover-based instrumentation based on the results of this study.en_UK
dc.relationFarrand WH, Wright SP, Glotch TD, Schröder C, Sklute EC & Dyar MD (2018) Spectroscopic examinations of hydro- and glaciovolcanic basaltic tuffs: Modes of alteration and relevance for Mars. Icarus, 309, pp. 241-259.
dc.rightsThis article was published under a Creative Commons license (
dc.subjectMars, surfaceen_UK
dc.titleSpectroscopic examinations of hydro- and glaciovolcanic basaltic tuffs: Modes of alteration and relevance for Marsen_UK
dc.typeJournal Articleen_UK
dc.type.statusVoR - Version of Recorden_UK
dc.contributor.funderNational Aeronautics and Space Administrationen_UK
dc.contributor.funderScience & Technology Facilities Councilen_UK
dc.contributor.affiliationSpace Science Instituteen_UK
dc.contributor.affiliationPlanetary Science Instituteen_UK
dc.contributor.affiliationStony Brook Universityen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationMount Holyoke Collegeen_UK
dc.contributor.affiliationMount Holyoke Collegeen_UK
dc.relation.funderprojectContinued geochemical investigation of Noachian crust at Endeavour Crater with Mars Exploration Rover Opportunityen_UK
Appears in Collections:Biological and Environmental Sciences Journal Articles

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