Xe-129 on the outgassing of the atmosphere

Details Xe-129 on the outgassing of the atmosphere Xe-129 on the outgassing of the atmosphere

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.4374t&link_type=abstract

Journal of Geophysical Research, vol. 85, Aug. 10, 1980, p. 4374-4378.

Physics

4

Atmospheric Composition, Earth Atmosphere, Earth Planetary Structure, Geochemistry, Outgassing, Xenon 129, Earth Mantle, Mathematical Models

Scientific paper

Because of the short half-life of its parent (I-129, 17 m.y.) and its own chemical inertness, Xe-129 offers unique insight into the problem of the outgassing history of the earth's atmosphere. Because the current atmosphere is different in Xe isotopic patterns than is the interior, the present atmosphere must have been largely outgassed before these patterns finished changing, that is, very early in earth history. Furthermore, there can have been no significant delay in the onset of outgassing; that is, the earth must have been initially hot. Because ancient sedimentary rocks indicate that the atmospheric Xe patterns have not changed substantially for over 3 b.y., models presuming a separate, lower mantle reservoir do not alter these conclusions. Similar conclusions have been reached before but have always carried a heavier burden of debatable assumptions.

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