Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.507m&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 507-508
Astronomy and Astrophysics
Astronomy
Astronomical Models, Earth (Planet), Iodine Isotopes, Outgassing, Planetary Evolution, Silicates, Solubility, Xenon Isotopes, Chemical Composition, Earth Mantle, Magma, Melting, Radioactive Decay
Scientific paper
Iodine-xenon systematics have been used to argue for an intense outgassing episode early in Earth history. The Xe-129/Xe-132 ratio is elevated in Mid Ocean Rich Basalts (MORBs) relative to Oceanic Island Basalts (OIBs). Xenon-129 is produced by the decay of short-lived I-129. Experimentally determined silicate-melt solubilities and mineral/melt partition coefficients (D) can be used to model systematics of I and Xe during magmatic outgassing. We consider a simple two-reservoir (mantle and atmosphere) model for partial melting and degassing of the MORB source mantle. Partial melting of the mantle occurs in equilibrium with residual minerals followed by eruption, degassing, and remixing of the entire lot. The composition of the mantle as a result will be a mixture of the degassed magma, magma that is not degassed, and residual minerals entrained in the melt. The partial pressure of I and Xe over the melt is a function of their molar mixing ratios with the dominant volatile species (water). If degassing alone is responsible for the elevated Xe-129/Xe-132 ratio of the MORB source mantle, then it did so under conditions with essentially no entrained minerals present in the mantle, i.e., a totally molten magma ocean. Furthermore, degassing must have occurred extremely rapidly, as short as one I-129 half-life. An alternative to this extreme view is recycling of I following outgassing perhaps involving differential water solubility of I and Xe.
Drake Michael J.
Musselwhite Donald Stanley
Swindle Timothy D.
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