Other
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..48..284k&link_type=abstract
Earth and Planetary Science Letters, Volume 48, Issue 2, p. 284-292.
Other
1
Scientific paper
A simple model of mass fractionation may explain the isotopic ratios of rare gases in volcanic materials. Single-stage mass fractionation of atmospheric rare gases predicts an upper limit for 20Ne/22Ne of 10.3 and a lower limit for 40Ar/36Ar of 280. The rare gas data in volcanic materials seem to support this interpretation.
Relatively low 40Ar/36Ar ratios, as low as 282, have been observed in recent Japanese volcanic rocks. Such a low 40Ar/36Ar ratio may be explained by mass fractionation of the atmospheric value if the rare gases represent those which were transported into the magma chamber with other volatile elements.
Both the amounts and the fractionated rare gas abundance pattern of lighter elements which are observed in pumices from the recent eruption of Mt. Usu, Southern Hokkaido, Japan, suggest the possibility of air injection into its magma chamber. Thus, the fractionation of rare gases in volcanic materials may be a common occurrence, and it must be considered in models for the origin of isotopic differences between rare gases in volcanic materials and the atmosphere.
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