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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Hydrothermal origin of halogens at Home Plate, Gusev Crater
Author(s): Schmidt, Mariek E
Ruff, Steven W
McCoy, Timothy J
Farrand, William H
Johnson, Jeffrey R
Gellert, Ralf
Ming, Douglas Wayne
Morris, Richard Van
Cabrol, Nathalie A
Lewis, Kevin W
Schröder, Christian
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Keywords: Mars
Issue Date: 19-Jun-2008
Date Deposited: 24-Oct-2013
Citation: Schmidt ME, Ruff SW, McCoy TJ, Farrand WH, Johnson JR, Gellert R, Ming DW, Morris RV, Cabrol NA, Lewis KW & Schröder C (2008) Hydrothermal origin of halogens at Home Plate, Gusev Crater. Journal of Geophysical Research: Planets, 113 (E6), Art. No.: E06S12.
Abstract: In 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), Mössbauer 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 Mössbauer 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.
DOI Link: 10.1029/2007JE003027
Rights: Copyright 2008 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.

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