SIMS measurement of magnesium isotopic ratios in ALH-77278 and -77307 chondrites
P(論文) Isotopic ratios of ^<24>(Mg)/^<25>(Mg) and ^<26>(Mg)/^<25>(Mg) have been measured for Mg-rich and Al-poor portions of matrix areas of ALH-77278 and -77307 meteorites by ion microprobe mass spectrometry. The magnesium isotopic ratios for the meteorites were compared with...
| Main Authors: | , |
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| Language: | English |
| Published: |
1983
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| Subjects: | |
| Online Access: | https://nipr.repo.nii.ac.jp/record/1571/files/KJ00000012204.pdf |
| Summary: | P(論文) Isotopic ratios of ^<24>(Mg)/^<25>(Mg) and ^<26>(Mg)/^<25>(Mg) have been measured for Mg-rich and Al-poor portions of matrix areas of ALH-77278 and -77307 meteorites by ion microprobe mass spectrometry. The magnesium isotopic ratios for the meteorites were compared with that for a terrestrial forsterite of laboratory standard. Clear excesses of ^<24>(Mg) 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. departmental bulletin paper |
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