Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..319f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 3, pp.319-328
Astronomy and Astrophysics
Astrophysics
15
Scientific paper
The degree of physical adsorption of Ne, Ar, Kr and Xe on pulverized samples of the Allende meteorite at 113°K has been measured. The observed pattern of equilibrium enrichment of heavy rare gases over light on the pulverized meteorite surfaces relative to the gas phase is similar to the enrichment pattern (Xe > Kr > Ar >> Ne, He) exhibited by "planetary primordial" rare gas when compared with the composition of solar rare gas. Results indicate that, at 113°K, a total nebular pressure of from 10 -2 to 10 -3 atm would be required to explain the Ar, Kr and Xe abundances in carbonaceous chondrites with an adsorption mechanism. This pressure estimate is compatible with the range of possible nebular pressures (10 -2 to 10 -6 atm), suggested by astrophysical arguments. However, the subsequent mechanism by which initially adsorbed gas might have been transferred into the interiors of grains cannot be identified at present. The hypothesis that the presence of &;planetary primordial' Ar, Kr and Xe in carbonaceous chondrites is due to their adsorption from the gaseous portion of the pre-planetary cloud is offered as an alternative to the hypothesis that these gases were incorporated as the result of attainment of solubility equilibrium between dust and gas.
Cannon W. A.
Fanale Fraser P.
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