Hebridean rock provides clue to life on Mars

September 16, 2016 by Robert Turbyne, University of Aberdeen
Hebridean rock provides clue to life on Mars
On Mars there are ‘Marsquakes’ which may produce hydrogen in the same way as on Earth. Credit: University of Aberdeen

Analysis of rocks in the Outer Hebrides has provided a tantalising clue that Mars may contain habitats which can potentially support life.

As preparations continue at NASA for a mission to Mars in 2018, researchers studying rocks on Barra and the Uists have demonstrated that hydrogen – which is essential for life – is formed by earthquakes.  On Mars there are 'Marsquakes' which may produce hydrogen in the same way.

The study, which has been published in the journal Astrobiology, was carried out by scientists from the University of Aberdeen, working alongside colleagues from Yale University and Brock University.  Their research was supported by the Science and Technology Facilities Council.

Professor John Parnell, from the University of Aberdeen's School of Geosciences, explained: "Earthquakes cause friction, and our analysis of ancient rock in the Outer Hebrides has demonstrated how this creates hydrogen.

"Hydrogen is a fuel for simple microbes, so microbes could live off hydrogen created in the Earth's subsurface as a result of seismic activity.

"This is a model that could apply to any other rocky planet, and on Mars there are so-called 'Marsquakes' that may produce hydrogen and therefore could feed life in the Martian sub-surface.

Credit: University of Aberdeen

"Our analysis finds that conservative estimates of current seismic activity on Mars predict generation that would be useful to microbes, which adds strength to the possibility of suitable habitats that could support in the Martian sub-surface.

"NASA has plans to measure on Mars during its 2018 InSight mission, and our data will make those measurements all the more interesting."

Explore further: Scientists find methane in Mars meteorites

More information: Sean McMahon et al. Evidence for Seismogenic Hydrogen Gas, a Potential Microbial Energy Source on Earth and Mars, Astrobiology (2016). DOI: 10.1089/ast.2015.1405

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FineStructureConstant
4.9 / 5 (7) Sep 16, 2016
Hmm, the text here is slightly misleading in saying that hydrogen is "formed by earthquakes" or "created in the Earth's subsurface". What they really mean is that hydrogen is released by compounds or rocks by frictional forces during seismic events or activity.

The paper's abstract also mentions that "release of H2 may also accompany the breakdown of ancient fault rocks, which are particularly abundant in the pervasively fractured martian crust.".

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