Mathematics – Logic
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995natur.374..432d&link_type=abstract
Nature, Volume 374, Issue 6521, pp. 432-434 (1995).
Mathematics
Logic
30
Scientific paper
ANCIENT fluvial networks on the surface of Mars suggest that it was warm and wet over three billion years ago. Surface features resembling massive outflow channels provide evidence that, even more recently, the martian crust contained the equivalent of a planet-wide reservoir of water several hundred metres deep1,2. But arguments based on the isotopic fractionation3,4 and present-day escape rate of hydrogen in the martian atmosphere require only 0.5 metres of crustal water today and about six metres in the past5. An additional constraint on the evolution of the isotopic composition of martian water has recently been obtained6 from measurements of the deuterium to hydrogen ratio of hydrous minerals in the SNC meteorites-meteorites that almost certainly originated on Mars. Here I show that these new data require that the modern crustal reservoirs of martian water must be quite large, at least several metres in global-equivalent depth. The deuterium enrichment of the present martian atmosphere then implies that the reservoir of crustal water on ancient Mars was several hundred metres deep, consistent with the geological evidence3,4.
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