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Effects of extreme cold and aridity on soils and habitability: McMurdo Dry Valleys as an analogue for the Mars Phoenix landing site

Published online by Cambridge University Press:  04 January 2012

L.K. Tamppari*
Affiliation:
Jet Propulsion Laboratory/Caltech, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
R.M. Anderson
Affiliation:
Tufts University, Medford, MA, USA
P.D. Archer JR
Affiliation:
NASA Johnson Space Center, Houston, TX, USA
S. Douglas
Affiliation:
Jet Propulsion Laboratory/Caltech, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
S.P. Kounaves
Affiliation:
Tufts University, Medford, MA, USA
C.P. Mckay
Affiliation:
NASA Ames Research Center, Moffett Field, CA, USA
D.W. Ming
Affiliation:
NASA Johnson Space Center, Houston, TX, USA
Q. Moore
Affiliation:
Tufts University, Medford, MA, USA
J.E. Quinn
Affiliation:
Jacobs Engineering, ESCG/NASA, Houston, TX, USA
P.H. Smith
Affiliation:
University of Arizona, Tucson, AZ, USA
S. Stroble
Affiliation:
Tufts University, Medford, MA, USA
A.P. Zent
Affiliation:
NASA Ames Research Center, Moffett Field, CA, USA

Abstract

The McMurdo Dry Valleys are among the driest, coldest environments on Earth and are excellent analogues for the Martian northern plains. In preparation for the 2008 Phoenix Mars mission, we conducted an interdisciplinary investigation comparing the biological, mineralogical, chemical, and physical properties of wetter lower Taylor Valley (TV) soils to colder, drier University Valley (UV) soils. Our analyses were performed for each horizon from the surface to the ice table. In TV, clay-sized particle distribution and less abundant soluble salts both suggested vertical and possible horizontal transport by water, and microbial biomass was higher. Alteration of mica to short-order phyllosilicates suggested aqueous weathering. In UV, salts, clay-sized materials, and biomass were more abundant near the surface, suggesting minimal downward translocation by water. The presence of microorganisms in each horizon was established for the first time in an ultraxerous zone. Higher biomass numbers were seen near the surface and ice table, perhaps representing locally more clement environments. Currently, water activity is too low to support metabolism at the Phoenix site, but obliquity changes may produce higher temperatures and sufficient water activity to permit microbial growth, if the populations could survive long dormancy periods (∼106 years).

Information

Type
Biological Sciences
Copyright
Copyright © Antarctic Science Ltd 2012

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