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dc.contributor.authorAshley, James Wen_UK
dc.contributor.authorGolombek, Matthewen_UK
dc.contributor.authorChristensen, Philip Ren_UK
dc.contributor.authorSquyres, Steven Wen_UK
dc.contributor.authorMcCoy, Timothy Jen_UK
dc.contributor.authorSchröder, Christianen_UK
dc.contributor.authorFleischer, Irisen_UK
dc.contributor.authorJohnson, Jeffrey Ren_UK
dc.contributor.authorHerkenhoff, Kenneth Een_UK
dc.contributor.authorParker, Timothy Jen_UK
dc.description.abstractThe weathering of meteorites found on Mars involves chemical and physical processes that can provide clues to climate conditions at the location of their discovery. Beginning on sol 1961, the Opportunity rover encountered three large iron meteorites within a few hundred meters of each other. In order of discovery, these rocks have been assigned the unofficial names Block Island, Shelter Island, and Mackinac Island. Each rock presents a unique but complimentary set of features that increase our understanding of weathering processes at Meridiani Planum. Significant morphologic characteristics interpretable as weathering features include (1) a large pit in Block Island, lined with delicate iron protrusions suggestive of inclusion removal by corrosive interaction; (2) differentially eroded kamacite and taenite lamellae in Block Island and Shelter Island, providing relative timing through crosscutting relationships with deposition of (3) an iron oxide–rich dark coating; (4) regmaglypted surfaces testifying to regions of minimal surface modification, with other regions in the same meteorites exhibiting (5) large‐scale, cavernous weathering (in Shelter Island and Mackinac Island). We conclude that the current size of the rocks is approximate to their original postfall contours. Their morphology thus likely results from a combination of atmospheric interaction and postfall weathering effects. Among our specific findings is evidence supporting (1) at least one possible episode of aqueous acidic exposure for Block Island; (2) ripple migration over portions of the meteorites; (3) a minimum of two separate episodes of wind abrasion; alternating with (4) at least one episode of coating‐forming chemical alteration, most likely at subzero temperatures.en_UK
dc.publisherThe American Geophysical Union/Wiley-Blackwellen_UK
dc.relationAshley JW, Golombek M, Christensen PR, Squyres SW, McCoy TJ, Schröder C, Fleischer I, Johnson JR, Herkenhoff KE & Parker TJ (2011) Evidence for mechanical and chemical alteration of iron‐nickel meteorites on Mars: Process insights for Meridiani Planum. Journal of Geophysical Research: Planets, 116 (E7), Art. No.: E00F20.
dc.rightsCopyright 2011 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.titleEvidence for mechanical and chemical alteration of iron‐nickel meteorites on Mars: Process insights for Meridiani Planumen_UK
dc.typeJournal Articleen_UK
dc.citation.jtitleJournal of Geophysical Research: Planetsen_UK
dc.type.statusVoR - Version of Recorden_UK
dc.contributor.affiliationArizona State Universityen_UK
dc.contributor.affiliationCalifornia Institute of Technologyen_UK
dc.contributor.affiliationArizona State Universityen_UK
dc.contributor.affiliationCornell Universityen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationJohannes Gutenberg University of Mainzen_UK
dc.contributor.affiliationU.S. Geological Surveyen_UK
dc.contributor.affiliationU.S. Geological Surveyen_UK
dc.contributor.affiliationCalifornia Institute of Technologyen_UK
rioxxterms.typeJournal Article/Reviewen_UK
local.rioxx.authorAshley, James W|en_UK
local.rioxx.authorGolombek, Matthew|en_UK
local.rioxx.authorChristensen, Philip R|en_UK
local.rioxx.authorSquyres, Steven W|en_UK
local.rioxx.authorMcCoy, Timothy J|en_UK
local.rioxx.authorSchröder, Christian|0000-0002-7935-6039en_UK
local.rioxx.authorFleischer, Iris|en_UK
local.rioxx.authorJohnson, Jeffrey R|en_UK
local.rioxx.authorHerkenhoff, Kenneth E|en_UK
local.rioxx.authorParker, Timothy J|en_UK
local.rioxx.projectInternal Project|University of Stirling|
Appears in Collections:Biological and Environmental Sciences Journal Articles

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