Noble gas components in planetary atmospheres and interiors in relation to solar wind and meteorites.

Details Noble gas components in planetary atmospheres and interiors in relation to solar wind and meteorites. Noble gas components in planetary atmospheres and interiors in relation to solar wind and meteorites.

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998piase.107..425m&link_type=abstract

Proc. Indian Acad. Sci., Earth Planet. Sci., Vol. 107, No. 4, p. 425 - 431

Computer Science

Noble Gases: Planetary Atmospheres, Noble Gases: Planetary Interiors, Noble Gases: Solar Wind, Noble Gases: Meteorites

Scientific paper

The authors discuss observed xenon isotopic signatures in Solar System reservoirs and possible relationships. The predominant trapped xenon component in ordinary chondrites (OC) is OC-Xe and its isotopic signature differs from Xe in ureilites, in carbonaceous chondrites, in the atmospheres of Earth and Mars, and in the solar wind. Additional minor Xe components were identified in type 3 chondrites and in the metal phase of chondrites. Xenon in the Martian atmosphere is found to be strongly mass fractionated, relative to solar Xe, favoring the heavy isotopes. Xenon in SNCs from the Martian mantle show admixture of solar-type Xe, which belongs to an elementally strongly fractionated component. The origin of the isotopic signatures of Ne and Xe in the terrestrial atmosphere are discussed in the light of evidence that the Xe isotopic fractionations in the Martian and terrestrial atmospheres are consistent. However, in the terrestrial atmospheric Xe component excesses are observed for 132Xe and also for 129,131Xe, relative to fractionated solar Xe. The suggested chemically fractionated fission Xe component (CFF-Xe) seems to closely match the above excesses. The authors discuss models of origin for planetary volatiles and possible processes driving their evolution to present day compositions.

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