SIMS measurement of magnesium isotopic ratios in ALH-77278 and -77307 chondrites

Details SIMS measurement of magnesium isotopic ratios in ALH-77278 and -77307 chondrites SIMS measurement of magnesium isotopic ratios in ALH-77278 and -77307 chondrites

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983polre..30..332n&link_type=abstract

(National Institute of Polar Research, Symposium on Antarctic Meteorites, 8th, Tokyo, Japan, Feb. 17-19, 1983) National Institut

Computer Science

Chondrites, Magnesium Isotopes, Meteoritic Composition, Aluminum Isotopes, Forsterite, Ion Probes, Mass Spectroscopy, Silicon Isotopes

Scientific paper

Isotopic ratios of Mg-24/Mg-25 and Mg-26/Mg-25 have been measured for Mg-rich and Al-poor portions of matrix areas of ALH-77278 and -77307 meteorites by ion mictroprobe mass spectrometry. The magnesium isotopic ratios for the meteorites were compared with that for a terrestrial forsterite of laboratory standard. Clear excesses of Mg-24 up to 10 permil have been found for the portions where concentration ratio of Al/Mg was less than 0.1 and that of Mg/Si was between 1.8 and 2.2.

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