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Science 30 October 1970:
Vol. 170. no. 3957, pp. 531 - 533
DOI: 10.1126/science.170.3957.531
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Articles

Carbon Dioxide Clathrate in the Martian Ice Cap

Stanley L. Miller 1 and William D. Smythe 1

1 Department of Chemistry, University of California, San Diego, La Jolla 92037

Measurements of the dissociation pressure of carbon dioxide hydrate show that this hydrate (CO2 · 6H2O) is stable relative to solid CO2 and water ice at temperatures above about 121°K. Since this hydrate forms from finely divided ice and gaseous CO2 in several hours at 150°K, it is likely to be present in the martian ice cap. The ice cap can consist of water ice, water ice + CO2 hydrate, or CO2 hydrate + solid CO2, but not water ice + solid CO2.


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