Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/17171
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dc.contributor.authorWang, Alianen_UK
dc.contributor.authorHaskin, Larry Aen_UK
dc.contributor.authorSquyres, Steven Wen_UK
dc.contributor.authorJolliff, Bradley Len_UK
dc.contributor.authorCrumpler, Larry Sen_UK
dc.contributor.authorGellert, Ralfen_UK
dc.contributor.authorSchröder, Christianen_UK
dc.contributor.authorHerkenhoff, Kenneth Een_UK
dc.contributor.authorHurowitz, Joel Aen_UK
dc.contributor.authorTosca, Nicholas Jen_UK
dc.contributor.authorFarrand, William Hen_UK
dc.contributor.authorAnderson, Robert Cen_UK
dc.contributor.authorKnudson, Amy Ten_UK
dc.date.accessioned2013-11-01T00:09:43Z-
dc.date.available2013-11-01T00:09:43Z-
dc.date.issued2006-02-21en_UK
dc.identifier.urihttp://hdl.handle.net/1893/17171-
dc.description.abstractExcavating into the shallow Martian subsurface has the potential to expose stratigraphic layers and mature regolith, which may hold a record of more ancient aqueous interactions than those expected under current Martian surface conditions. During the Spirit rover’s exploration of Gusev crater, rover wheels were used to dig three trenches into the subsurface regolith down to 6–11 cm depth: Road Cut, the Big Hole, and The Boroughs. A high oxidation state of Fe and high concentrations of Mg, S, Cl, and Br were found in the subsurface regolith within the two trenches on the plains, between the Bonneville crater and the foot of Columbia Hills. Data analyses on the basis of geochemistry and mineralogy observations suggest the deposition of sulfate minerals within the subsurface regolith, mainly Mg-sulfates accompanied by minor Ca-sulfates and perhaps Fe-sulfates. An increase of Fe2O3, an excess of SiO2, and a minor decrease in the olivine proportion relative to surface materials are also inferred. Three hypotheses are proposed to explain the geochemical trends observed in trenches: (1) multiple episodes of acidic fluid infiltration, accompanied by in situ interaction with igneous minerals and salt deposition; (2) an open hydrologic system characterized by ion transportation in the fluid, subsequent evaporation of the fluid, and salt deposition; and (3) emplacement and mixing of impact ejecta of variable composition. While all three may have plausibly contributed to the current state of the subsurface regolith, the geochemical data are most consistent with ion transportation by fluids and salt deposition as a result of open-system hydrologic behavior. Although sulfates make up >20 wt.% of the regolith in the wall of The Boroughs trench, a higher hydrated sulfate than kieserite within The Boroughs or a greater abundance of sulfates elsewhere than is seen in The Boroughs wall regolith would be needed to hold the structural water indicated by the water-equivalent hydrogen concentration observed by the Gamma-Ray Spectrometer on Odyssey in the Gusev region.en_UK
dc.language.isoenen_UK
dc.publisherAmerican Geophysical Unionen_UK
dc.relationWang A, Haskin LA, Squyres SW, Jolliff BL, Crumpler LS, Gellert R, Schröder C, Herkenhoff KE, Hurowitz JA, Tosca NJ, Farrand WH, Anderson RC & Knudson AT (2006) Sulfate deposition in subsurface regolith in Gusev crater, Mars. Journal of Geophysical Research: Planets, 111 (E2). https://doi.org/10.1029/2005JE002513en_UK
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.subjectGuseven_UK
dc.subjectMarsen_UK
dc.subjectsulfateen_UK
dc.titleSulfate deposition in subsurface regolith in Gusev crater, Marsen_UK
dc.typeJournal Articleen_UK
dc.identifier.doi10.1029/2005JE002513en_UK
dc.citation.jtitleJournal of Geophysical Research: Planetsen_UK
dc.citation.issn2169-9100en_UK
dc.citation.issn2169-9097en_UK
dc.citation.volume111en_UK
dc.citation.issueE2en_UK
dc.citation.publicationstatusPublisheden_UK
dc.citation.peerreviewedRefereeden_UK
dc.type.statusVoR - Version of Recorden_UK
dc.author.emailchristian.schroeder@stir.ac.uken_UK
dc.contributor.affiliationWashington University In Saint Louisen_UK
dc.contributor.affiliationWashington University In Saint Louisen_UK
dc.contributor.affiliationCornell Universityen_UK
dc.contributor.affiliationWashington University In Saint Louisen_UK
dc.contributor.affiliationNew Mexico Museum of Natural History and Scienceen_UK
dc.contributor.affiliationMax Planck Institute of Chemistryen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationU.S. Geological Surveyen_UK
dc.contributor.affiliationCalifornia Institute of Technologyen_UK
dc.contributor.affiliationState University of New York At Stony Brooken_UK
dc.contributor.affiliationSpace Science Instituteen_UK
dc.contributor.affiliationCalifornia Institute of Technologyen_UK
dc.contributor.affiliationArizona State Universityen_UK
dc.identifier.isiWOS:000235967900001en_UK
dc.identifier.scopusid2-s2.0-33645647617en_UK
dc.identifier.wtid682347en_UK
dc.contributor.orcid0000-0002-7935-6039en_UK
dcterms.dateAccepted2006-02-21en_UK
dc.date.filedepositdate2013-10-28en_UK
rioxxterms.typeJournal Article/Reviewen_UK
rioxxterms.versionVoRen_UK
local.rioxx.authorWang, Alian|en_UK
local.rioxx.authorHaskin, Larry A|en_UK
local.rioxx.authorSquyres, Steven W|en_UK
local.rioxx.authorJolliff, Bradley L|en_UK
local.rioxx.authorCrumpler, Larry S|en_UK
local.rioxx.authorGellert, Ralf|en_UK
local.rioxx.authorSchröder, Christian|0000-0002-7935-6039en_UK
local.rioxx.authorHerkenhoff, Kenneth E|en_UK
local.rioxx.authorHurowitz, Joel A|en_UK
local.rioxx.authorTosca, Nicholas J|en_UK
local.rioxx.authorFarrand, William H|en_UK
local.rioxx.authorAnderson, Robert C|en_UK
local.rioxx.authorKnudson, Amy T|en_UK
local.rioxx.projectInternal Project|University of Stirling|https://isni.org/isni/0000000122484331en_UK
local.rioxx.freetoreaddate2013-10-28en_UK
local.rioxx.licencehttp://www.rioxx.net/licenses/all-rights-reserved|2013-10-28|en_UK
local.rioxx.filenameWangSulfateJGR_02_06.pdfen_UK
local.rioxx.filecount1en_UK
local.rioxx.source2169-9097en_UK
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