Degassing of the outer shells of a planet under the conditions of the existence of a 'magmatic ocean'

Details Degassing of the outer shells of a planet under the conditions of the existence of a 'magmatic ocean' Degassing of the outer shells of a planet under the conditions of the existence of a 'magmatic ocean'

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986geokh......147k&link_type=abstract

Geokhimiia (ISSN 0016-7525), Feb. 1986, p. 147-156. In Russian.

Computer Science

Degassing, Magma, Planetary Atmospheres, Planetary Surfaces, Basalt, Gas Evolution, Geochemistry, Graphite, Volatility

Scientific paper

The degassing behavior of a basalt magma layer containing volatile components during the process of magmatic-ocean development was analyzed on the basis of experimental and thermodynamic data on interactions of C-O-H volatiles with silicate melts under different conditions of oxidation and reduction. It is shown that the degassing process is accompanied by progressive changes in the composition of the evolving gases. The 'poorly soluble' magma components such as CO2 (and, in the presence of graphite, also CO, H2, and CH4) are evolved in the initial stages of the process, whereas the 'readily soluble' volatiles such as H2O accumulate in the melt and would be released only during the final crystallization stages of the magmatic ocean. This time-dependent fractionation of the volatiles can determine the subsequent evolution of planetary atmospheres.

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