Please use this identifier to cite or link to this item:
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Evidence for montmorillonite or its compositional equivalent in Columbia Hills, Mars
Author(s): Clark, Benton C
Arvidson, Raymond E
Gellert, Ralf
Morris, Richard Van
Ming, Douglas Wayne
Richter, Lutz
Ruff, Steven W
Michalski, Joseph R
Farrand, William H
Yen, Albert S
Herkenhoff, Kenneth E
Li, Ron
Squyres, Steven W
Schröder, Christian
Klingelhoefer, Goestar
Bell, III James F
Contact Email:
Keywords: Mars
Columbia Hills
Issue Date: Jun-2007
Citation: Clark BC, Arvidson RE, Gellert R, Morris RV, Ming DW, Richter L, Ruff SW, Michalski JR, Farrand WH, Yen AS, Herkenhoff KE, Li R, Squyres SW, Schröder C, Klingelhoefer G & Bell III JF (2007) Evidence for montmorillonite or its compositional equivalent in Columbia Hills, Mars, Journal of Geophysical Research: Planets, 112 (E6), Art. No.: E06S01.
Abstract: During its exploration of the Columbia Hills, the Mars Exploration Rover ‘‘Spirit’’ encountered several similar samples that are distinctly different from Martian meteorites and known Gusev crater soils, rocks, and sediments. Occurring in a variety of contexts and locations, these ‘‘Independence class’’ samples are rough-textured, iron-poor (equivalent FeO 4 wt%), have high Al/Si ratios, and often contain unexpectedly high concentrations of one or more minor or trace elements (including Cr, Ni, Cu, Sr, and Y). Apart from accessory minerals, the major component common to these samples has a compositional profile of major and minor elements which is similar to the smectite montmorillonite, implicating this mineral, or its compositional equivalent. Infrared thermal emission spectra do not indicate the presence of crystalline smectite. One of these samples was found spatially associated with a ferric sulfate-enriched soil horizon, possibly indicating a genetic relationship between these disparate types of materials. Compared to the nearby Wishstone and Watchtower class rocks, major aqueous alteration involving mineral dissolution and mobilization with consequent depletions of certain elements is implied for this setting and may be undetectable by remote sensing from orbit because of the small scale of the occurrences and obscuration by mantling with soil and dust.
DOI Link:
Rights: Copyright 2007 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

This item is protected by original copyright

Items in the Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

If you believe that any material held in STORRE infringes copyright, please contact providing details and we will remove the Work from public display in STORRE and investigate your claim.