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Geology; March 2006; v. 34; no. 3; p. 149-152; DOI: 10.1130/G22311.1
© 2006 Geological Society of America
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Interglacial clathrate destabilization on Mars: Possible contributing source of its atmospheric methane

Olga Prieto-Ballesteros1, Jeffrey S. Kargel2, Alberto G. Fairén3, David C. Fernández-Remolar4, James M. Dohm5 and Ricardo Amils6

1 Centro de Astrobiología (INTA-CSIC), 28850-Torrejón de Ardoz, Madrid, Spain
2 Department of Hydrology and Water Resources, University of Arizona, Tucson, Arizona 85721, USA
3 Centro de Biología Molecular, CSIC-Universidad Autónoma de Madrid, 28049-Cantoblanco, Madrid, Spain
4 Centro de Astrobiología (INTA-CSIC), 28850-Torrejón de Ardoz, Madrid, Spain
5 Department of Hydrology and Water Resources, University of Arizona, Tucson, Arizona 85721, USA
6 Centro de Astrobiología (INTA-CSIC), 28850-Torrejón de Ardoz, Madrid, Spain, and Centro de Biología Molecular, CSIC-Universidad Autónoma de Madrid, 28049-Cantoblanco, Madrid, Spain

The presence of methane has been recently detected in the martian atmosphere, suggesting a contemporary source such as volcanism or microbial activity. Here we show that methane may be released by the destabilization of methane clathrate hydrates, triggered by the interglacial climate change starting 0.4 Ma. Clathrate hydrates are nonstoichiometric crystalline compounds in which a water ice lattice forms cages that contain apolar gas molecules, such as methane [CH4·nH2O] and carbon dioxide [CO2·nH2O]. The loss of shallow ground ice eliminates confining pressure, initiating the destabilization of clathrate hydrates and the release of methane to the atmosphere. This alternative process does not restrict the methane's age to 430 yr (maximum residence time of methane gas in martian atmosphere), because clathrate hydrates can preserve (encage) methane of ancient origin for long time periods.

Key Words: methane • Mars • clathrate • hydrate




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J. S. Kargel, R. Furfaro, O. Prieto-Ballesteros, J. A. P. Rodriguez, D. R. Montgomery, A. R. Gillespie, G. M. Marion, and S. E. Wood
Martian hydrogeology sustained by thermally insulating gas and salt hydrates
Geology, November 1, 2007; 35(11): 975 - 978.
[Abstract] [Full Text] [PDF]


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