Evidence of phyllosilicates in Wooly Patch, an altered rock encountered at West Spur, Columbia Hills, by the Spirit rover in Gusev crater, Mars

Wang, A. and Korotev, R. L. and Jolliff, B. L. and Haskin, L. A. and Crumpler, L. and Farrand, W. H. and Herkenhoff, K. E. and de Souza Jr, P. and Kusack, A. G. and Hurowitz, J. A. and Tosca, N. J. (2006) Evidence of phyllosilicates in Wooly Patch, an altered rock encountered at West Spur, Columbia Hills, by the Spirit rover in Gusev crater, Mars. Journal of Geophysical Research E: Planets, 111 (2). DOI 10.1029/2005JE002516

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Abstract

On its traverse to Columbia Hills, the Mars Exploration Rover Spirit investigated an outcrop designated "Wooly Patch" that exhibited morphological, mineralogical, and geochemical characteristics at the extreme ends of ranges observed among rocks studied at West Spur, a westward projecting salient near the foot of the Columbia Hills, Gusev crater. The major-element composition and Fe-mineralogy, as determined by the Alpha-Particle X-ray Spectrometer and MC6ssbauer Spectrometer, are inconsistent with any reasonable assemblage of basaltic minerals in that there is an excess of Si and Al. The combined data are best explained by the presence of 14-17% phyllosilicate minerals. Phyllosilicates that account for the composition and cation ratios include members of the kaolinite, serpentine, chlorite, and septechlorite groups. The potential existence of kaolinite-type Al-rich phyllosilicates within the Wooly Patch outcrop suggests a mildly acidic environment (pH 4-6) in the past and an open hydrologic system with good drainage conditions in the environment where these rocks were altered. Copyright 2006 by the American Geophysical Union.

Item Type: Article
Uncontrolled Keywords: IA58
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Journal of Geophysical Research E: Planets
Volume: 111
Identification Number: 10.1029/2005JE002516
Depositing User: Sarah Humbert
Date Deposited: 17 Dec 2009 11:59
Last Modified: 23 Jul 2013 09:56
URI: http://eprints.esc.cam.ac.uk/id/eprint/1256

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