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dc.contributor.authorMorris, Richard Vanen_UK
dc.contributor.authorKlingelhoefer, Goestaren_UK
dc.contributor.authorSchröder, Christianen_UK
dc.contributor.authorRodionov, Daniel Sen_UK
dc.contributor.authorYen, Albert Sen_UK
dc.contributor.authorMing, Douglas Wayneen_UK
dc.contributor.authorde Souza Jr, Paulo Aen_UK
dc.contributor.authorWdowiak, Thomas Jen_UK
dc.contributor.authorFleischer, Irisen_UK
dc.contributor.authorGellert, Ralfen_UK
dc.contributor.authorBernhardt, Bodoen_UK
dc.contributor.authorBonnes, Uen_UK
dc.contributor.authorCohen, Barbara Aen_UK
dc.contributor.authorEvlanov, E Nen_UK
dc.contributor.authorFoh, Jen_UK
dc.description.abstractThe Mössbauer (MB) spectrometer on Opportunity measured the Fe oxidation state, identified Fe-bearing phases, and measured relative abundances of Fe among those phases at Meridiani Planum, Mars. Eight Fe-bearing phases were identified: jarosite (K,Na,H3O)(Fe,Al)(OH)6(SO4)2, hematite, olivine, pyroxene, magnetite, nanophase ferric oxides (npOx), an unassigned ferric phase, and metallic Fe (kamacite). Burns Formation outcrop rocks consist of hematite-rich spherules dispersed throughout S-rich rock that has nearly constant proportions of Fe3+ from jarosite, hematite, and npOx (29%, 36%, and 20% of total Fe). The high oxidation state of the S-rich rock (Fe3+/FeT ~ 0.9) implies that S is present as the sulfate anion. Jarosite is mineralogical evidence for aqueous processes under acid-sulfate conditions because it has structural hydroxide and sulfate and it forms at low pH. Hematite-rich spherules, eroded from the outcrop, and their fragments are concentrated as hematite-rich soils (lag deposits) on ripple crests (up to 68% of total Fe from hematite). Olivine, pyroxene, and magnetite are primarily associated with basaltic soils and are present as thin and locally discontinuous cover over outcrop rocks, commonly forming aeolian bedforms. Basaltic soils are more reduced (Fe3+/FeT ~ 0.2–0.4), with the fine-grained and bright aeolian deposits being the most oxidized. Average proportions of total Fe from olivine, pyroxene, npOx, magnetite, and hematite are 33%, 38%, 18%, 6%, and 4%, respectively. TheMB parameters of outcrop npOx and basaltic-soil npOx are different, but it is not possible to infer mineralogical information beyond octahedrally coordinated Fe3+. Basaltic soils at Meridiani Planum and Gusev crater have similar Fe-mineralogical compositions.en_UK
dc.publisherAmerican Geophysical Unionen_UK
dc.relationMorris RV, Klingelhoefer G, Schröder C, Rodionov DS, Yen AS, Ming DW, de Souza Jr PA, Wdowiak TJ, Fleischer I, Gellert R, Bernhardt B, Bonnes U, Cohen BA, Evlanov EN & Foh J (2006) Mossbauer mineralogy of rock, soil, and dust at Meridiani Planum, Mars: Opportunity's journey across sulfate-rich outcrop, basaltic sand and dust, and hematite lag deposits. Journal of Geophysical Research: Planets, 111 (E12), Art. No.: E12S15.
dc.rightsCopyright 2006 by the American Geophysical Union. AGU allows authors to deposit their journal articles if the version is the final published citable version of record, the AGU copyright statement is clearly visible on the posting, and the posting is made 6 months after official publication by the AGU.en_UK
dc.subjectMars Exploration Roveren_UK
dc.subjectMeridiani Planumen_UK
dc.titleMossbauer mineralogy of rock, soil, and dust at Meridiani Planum, Mars: Opportunity's journey across sulfate-rich outcrop, basaltic sand and dust, and hematite lag depositsen_UK
dc.typeJournal Articleen_UK
dc.citation.jtitleJournal of Geophysical Research: Planetsen_UK
dc.type.statusVoR - Version of Recorden_UK
dc.description.notesAdditonal co-authors: P Gütlich, E Kankeleit, T McCoy, DW Mittlefehldt, F Renz, ME Schmidt, B Zubkov, SW Squyres, RE Arvidsonen_UK
dc.contributor.affiliationNational Aeronautics and Space Administration (NASA)en_UK
dc.contributor.affiliationJohannes Gutenberg University of Mainzen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationJohannes Gutenberg University of Mainzen_UK
dc.contributor.affiliationCalifornia Institute of Technologyen_UK
dc.contributor.affiliationNational Aeronautics and Space Administration (NASA)en_UK
dc.contributor.affiliationUniversity of Tasmaniaen_UK
dc.contributor.affiliationUniversity of Alabama at Birminghamen_UK
dc.contributor.affiliationJohannes Gutenberg University of Mainzen_UK
dc.contributor.affiliationUniversity of Guelphen_UK
dc.contributor.affiliationJohannes Gutenberg University of Mainzen_UK
dc.contributor.affiliationDarmstadt University of Technology, Germanyen_UK
dc.contributor.affiliationNational Aeronautics and Space Administration (NASA)en_UK
dc.contributor.affiliationSpace Research Institute IKI, Russiaen_UK
dc.contributor.affiliationJohannes Gutenberg University of Mainzen_UK
rioxxterms.typeJournal Article/Reviewen_UK
local.rioxx.authorMorris, Richard Van|en_UK
local.rioxx.authorKlingelhoefer, Goestar|en_UK
local.rioxx.authorSchröder, Christian|0000-0002-7935-6039en_UK
local.rioxx.authorRodionov, Daniel S|en_UK
local.rioxx.authorYen, Albert S|en_UK
local.rioxx.authorMing, Douglas Wayne|en_UK
local.rioxx.authorde Souza Jr, Paulo A|en_UK
local.rioxx.authorWdowiak, Thomas J|en_UK
local.rioxx.authorFleischer, Iris|en_UK
local.rioxx.authorGellert, Ralf|en_UK
local.rioxx.authorBernhardt, Bodo|en_UK
local.rioxx.authorBonnes, U|en_UK
local.rioxx.authorCohen, Barbara A|en_UK
local.rioxx.authorEvlanov, E N|en_UK
local.rioxx.authorFoh, J|en_UK
local.rioxx.projectInternal Project|University of Stirling|
local.rioxx.filenameMorris (2006 JGRE) Mossbauer mineralogy at Meridiani Planum Mars.pdfen_UK
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