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Published Online: 3 February 2009

Short- and Long-Term Olivine Weathering in Svalbard: Implications for Mars

Publication: Astrobiology
Volume 8, Issue Number 6


Liquid water is essential to life as we know it on Earth; therefore, the search for water on Mars is a critical component of the search for life. Olivine, a mineral identified as present on Mars, has been proposed as an indicator of the duration and characteristics of water because it dissolves quickly, particularly under low-pH conditions. The duration of olivine persistence relative to glass under conditions of aqueous alteration reflects the pH and temperature of the reacting fluids. In this paper, we investigate the utility of 3 methodologies to detect silicate weathering in a Mars analog environment (Sverrefjell volcano, Svalbard). CheMin, a miniature X-ray diffraction instrument developed for flight on NASA's upcoming Mars Science Laboratory, was deployed on Svalbard and was successful in detecting olivine and weathering products. The persistence of olivine and glass in Svalbard rocks was also investigated via laboratory observations of weathered hand samples as well as an in situ burial experiment. Observations of hand samples are consistent with the inference that olivine persists longer than glass at near-zero temperatures in the presence of solutions at pH ∼7–9 on Svalbard, whereas in hydrothermally altered zones, glass has persisted longer than olivine in the presence of fluids at similar pH at ∼50°C. Analysis of the surfaces of olivine and glass samples, which were buried on Sverrefjell for 1 year and then retrieved, documented only minor incipient weathering, though these results suggest the importance of biological impacts. The 3 types of observations (CheMin, laboratory observations of hand samples, burial experiments) of weathering of olivine and glass at Svalbard show promise for interpretation of weathering on Mars. Furthermore, the weathering relationships observed on Svalbard are consistent with laboratory-measured dissolution rates, which suggests that relative mineral dissolution rates in the laboratory, in concert with field observations, can be used to yield valuable information regarding the pH and temperature of reacting martian fluids. Astrobiology 8, 1079–1092.

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Published In

cover image Astrobiology
Volume 8Issue Number 6December 2008
Pages: 1079 - 1092
PubMed: 19191538


Published online: 3 February 2009
Published in print: December 2008


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E.M. Hausrath
Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania.
NASA Johnson Space Center, Houston, Texas
A.H. Treiman
Lunar and Planetary Institute, Houston, Texas.
E. Vicenzi
Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC.
D.L. Bish
Department of Geological Sciences, Indiana University Bloomington, Indiana.
D. Blake
NASA Ames Research Center, Moffett Field, California.
P. Sarrazin
inXitu, Inc., Mountain View, California.
T. Hoehler
NASA Ames Research Center, Moffett Field, California.
I. Midtkandal
Department of Geosciences, University of Oslo, Oslo, Norway.
A. Steele
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC.
S.L. Brantley
Department of Geosciences, Pennsylvania State University, University Park, Pennsylvania.

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