Hydrothermal origin of halogens at Home Plate, Gusev Crater

dc.contributor.authorSchmidt, M. E.
dc.contributor.authorRuff, S. W.
dc.contributor.authorMcCoy, Timothy J.
dc.contributor.authorFarrand, W. H.
dc.contributor.authorJohnson, J. R.
dc.contributor.authorGellert, R.
dc.contributor.authorMing, D. W.
dc.contributor.authorMorris, R. V.
dc.contributor.authorCabrol, Nathalie A.
dc.contributor.authorLewis, K. W.
dc.contributor.authorSchroeder, C.
dc.date.accessioned2013-04-22T18:26:28Z
dc.date.available2013-04-22T18:26:28Z
dc.date.issued2008
dc.description.abstractIn the Inner Basin of the Columbia Hills, Gusev Crater is Home Plate, an 80 m platform of layered clastic rocks of the Barnhill class with microscopic and macroscopic textures, including a bomb sag, suggestive of a phreatomagmatic origin. We present data acquired by the Spirit Mars Exploration Rover by Alpha Particle X-Ray Spectrometer (APXS), Mossbauer Spectrometer, Miniature Thermal Emission Spectrometer (Mini-TES), and Panoramic Camera (Pancam) for the Barnhill class rocks and nearby vesicular Irvine class basalts. In major element concentrations (e. g., SiO2, Al2O3, MgO, and FeO*), the two rock classes are similar, suggesting that they are derived from a similar magmatic source. The Barnhill class, however, has higher abundances of Cl, Br, Zn, and Ge with comparable SO3 to the Irvine basalts. Nanophase ferric oxide (np ox) and volcanic glass were detected in the Barnhill class rocks by Mossbauer and Mini-TES, respectively, and imply greater alteration and cooling rates in the Barnhill than in the Irvine class rocks. The high volatile elements in the Barnhill class agree with volcanic textures that imply interaction with a briny groundwater during eruption and (or) by later alteration. Differences in composition between the Barnhill and Irvine classes allow the fingerprinting of a Na-Mg-Zn-Ge-Cl-Br (+/- Fe +/- Ca +/- CO2) brine with low S. Nearby sulfate salt soils of fumarolic origin may reflect fractionation of an acidic S-rich vapor during boiling of a hydrothermal brine at depth. Persistent groundwater was likely present during and after the formation of Home Plate.
dc.format.extentE06S12–E06S12
dc.identifier2169-9097
dc.identifier.citationSchmidt, M. E., Ruff, S. W., McCoy, Timothy J., Farrand, W. H., Johnson, J. R., Gellert, R., Ming, D. W., Morris, R. V., Cabrol, Nathalie A., Lewis, K. W., and Schroeder, C. 2008. "<a href="https://repository.si.edu/handle/10088/20556">Hydrothermal origin of halogens at Home Plate, Gusev Crater</a>." <em>Journal of Geophysical Research. E. Planets</em>, 113 E06S12–E06S12.
dc.identifier.issn2169-9097
dc.identifier.urihttp://hdl.handle.net/10088/20556
dc.publisherAMER GEOPHYSICAL UNION
dc.relation.ispartofJournal of Geophysical Research. E. Planets 113
dc.titleHydrothermal origin of halogens at Home Plate, Gusev Crater
dc.typearticle
sro.description.unitCHEMISTRY
sro.description.unitCHLORINE
sro.description.unitNMNH
sro.description.unitNH-Mineral Sciences
sro.identifier.itemID73175
sro.identifier.refworksID79740
sro.identifier.urlhttps://repository.si.edu/handle/10088/20556
sro.publicationPlaceWASHINGTON; 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA

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