Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p33h..02n&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P33H-02
Physics
[5455] Planetary Sciences: Solid Surface Planets / Origin And Evolution, [6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
Ascending magmas likely played a major role in redistributing material from the martian mantle to the crust, from the crust to the surface, and finally to the atmosphere, particularly during rapid growth of the secondary crust. This redistribution may have involved early loss of dense mineral phases from the magma due to crystal fractionation at the base of the crust and addition of these phases to the deep crust. Further ascent into the crust could have involved loss of magmatic fluids with concomitant addition of volatile components to the crust through fluid/wallrock interaction. As the magma reached the shallow subsurface and surface, reaction of magmatic vapors with surface materials during outgassing would influence how much of the volatile load was actually added to the martian atmosphere and the nature of material added to the surface through vapor/soil interaction and sublimation. The changes in the compositional nature of fluids arising from changes in pressure, temperature, and residual melt composition, likely led to continual modification of the volatile load during magma ascent. Thus, the magmatic contribution to the martian atmosphere may have been quite different than the initial magmatic volatile load. In order to provide first-order constraints on the nature of magmatic volatiles contributed to the evolving early martian atmosphere, a multi-faceted study has been initiated. It integrates (i) experimental mineral/melt phase equilibria for martian magmas (which constrain the nature of minerals left behind and the effect on the magmatic volatile budget), (ii) theoretical and experimental constraints on the compositional nature of exsolved fluids as a function of pressure and temperature (which indicate the nature of volatiles retained to shallow levels), (iii) new experimental data on differential outgassing of magmatic volatiles into an oxidized CO2-rich atmosphere and the nature of sublimates produced, and (iv) sequestration of magmatic volatiles through reaction with surface materials. The predicted coupled effects of these, based on available and new data, will be presented.
Nekvasil Hanna
Ustunisik G. K.
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