Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.103...55b&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 103, no. 1-4, April 1991, p. 55-68.
Other
10
Chondrites, Isotopes, Meteoritic Composition, Oxidation, Rare Gases, Solar Wind, Argon, Helium, Neon, Nitrogen
Scientific paper
The paper reports on a set of experiments intended to test the feasibility of determining elemental and isotopic ratios of the noble gases and nitrogen in the solar wind in metal separates from gas-rich ordinary chondrites. Helium, neon, and argon show clear evidence of a solar wind signature, while no solar component could be identified for xenon and nitrogen. Helium, neon, and argon elemental isotopic ratios appear to depend on depth within the metal grains. The ratios derived indicate that the Weston meteorite did not acquire its solar wind gases from a recent exposure to solar wind, but more probably at a time in the past similar to or even earlier than the exposure time of Apollo 17 breccias. The Ar-36/Ar-38 ratio, in tandem with other recent determinations of this value, indicates that the solar and terrestrial values can no longer be assumed to be equivalent.
Becker Robert H.
Pepin Robert O.
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