Cosmic ray produced noble gases in mesosiderite meteorites

Details Cosmic ray produced noble gases in mesosiderite meteorites Cosmic ray produced noble gases in mesosiderite meteorites

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phdt.........2e&link_type=abstract

Ph.D. Thesis Texas A&M Univ., College Station.

Computer Science

Cosmic Rays, Meteorites, Rare Gases, Argon Isotopes, Neon Isotopes, Spectroscopic Analysis, Xenon Isotopes

Scientific paper

Mass spectrometric analysis of the noble gas isotopes were performed on the mesosiderites, Clover springs, Crab Orchard, Patwar, and Hainholtz with comparative analyses also conducted on the achondrites, Binda and Pavlovka. All samples were found to be rich in cosmogenic neon and argon. The N-21/N-22 ratio showed a large variation, between 0.83 and 1.00, indicating a definite dependence on the combined effects of target element abundance and cosmic ray shielding. The shielding effect seems to be especially pronounced in the mesosiderites. The Ar-36/AR-38 ratio for spalation was found to be approximately 0.65. Cosmic ray exposure ages determined from cosmogenic argon abundances fall in the range 40 to 87 myr for mesosiderites. Crab Orchard gave a K-Ar age of 3.2 times 10 to the 9th power yr. The Binda achondrite gave 44 myr and 3.2 times 10 to the 9th power yr respectively for cosmic ray exposure and K-ARr ages.

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