Stable magnesium isotopes, 26Al, 10Be, and 26Mg/(26Al) exposure ages of iron meteorites

Details Stable magnesium isotopes, 26Al, 10Be, and 26Mg/(26Al) exposure ages of iron meteorites Stable magnesium isotopes, 26Al, 10Be, and 26Mg/(26Al) exposure ages of iron meteorites

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.136..397x&link_type=abstract

Earth and Planetary Science Letters, vol. 136, Issue 3-4, pp.397-406

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Scientific paper

Concentrations of magnesium isotopes in the iron meteorites Charlotte, Picacho, Tlacotepec, and Grant between 0.15 and 5 ppbw have been measured by glow discharge mass spectrometry, typically with a precision of 15%. The 25 Mg/ 24 Mg and 26 Mg/ 24 Mg ratios are well above terrestrial values in most samples indicating the presence of a component produced by cosmic rays. Inferred concentrations of cosmogenic 26 Mg range from barely detectable to 0.255 ppb by mass. 26 Al and 10 Be activities were measured in the same four and other iron meteorites by accelerator mass spectrometry. Cosmic ray exposure ages based on the cosmogenic 26 Mg/ 26 Al ratios are comparable to, but not precise enough to distinguish between discordant, published ages obtained from other isotopes. Measured primordial or common magnesium contents are in the range between 0.2 and 4.6 ppb.

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