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Sampling methane in hydrothermal minerals on Earth and Mars

Published online by Cambridge University Press:  16 February 2012

Sean McMahon*
Affiliation:
School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK
John Parnell
Affiliation:
School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK
Nigel J. F. Blamey
Affiliation:
Department of Earth and Environmental Science, New Mexico Tech, Socorro, NM 87801, USA

Abstract

The source of Martian atmospheric methane is unknown. On Earth, hydrothermal mineral deposits contain ancient methane together with a host of chemical and geological lines of evidence for the mechanism of gas production. Such deposits are therefore potentially attractive sampling sites on Mars. In order to evaluate this potential, hydrothermal calcite veins were sampled across the Caithness region of Scotland and analysed for methane by an incremental-crushing mass spectrometry technique that may be adaptable to Mars rovers. Methane was detected in all samples. Variations in the quantity of methane released were found to relate directly to the geological history of the localities. Calcite particle size was found to affect measurements in a systematic and informative way. Oxidative weathering had no discernable effect on methane recoverability. These results suggest that the technique is sensitive and informative enough to deserve consideration for missions to Mars.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2012

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