SIMS measurement of magnesium isotopic ratios in Yamato-74191 and -75028 meteorites

P(論文) Isotopic ratios of ^<24>(Mg)/^<25>(Mg) and ^<26>(Mg)/^<25>(Mg) have been measured for Mg-rich and A1-poor portions of matrix parts of the Yamato-74191 and -75028 meteorites with a Hitachi IMA 2A ion microprobe mass analyzer. Several terrestrial samples of lherzolites an...

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Bibliographic Details
Main Authors: Nishimura, Hiroshi, Okano, Jun
Language:English
Published: 1982
Subjects:
Yamato
Memoirs of National Institute of Polar Research
Polar Research
Online Access:https://nipr.repo.nii.ac.jp/record/1388/files/KJ00000012022.pdf
https://nipr.repo.nii.ac.jp/records/1388
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Summary:P(論文) Isotopic ratios of ^<24>(Mg)/^<25>(Mg) and ^<26>(Mg)/^<25>(Mg) have been measured for Mg-rich and A1-poor portions of matrix parts of the Yamato-74191 and -75028 meteorites with a Hitachi IMA 2A ion microprobe mass analyzer. Several terrestrial samples of lherzolites and a dunite were also analyzed. A clear evidence for the excess of ^<24>(Mg) has been found in the portions of Yamato-74191,where Mg/Si ratio is higher than 1.5 and Al/Mg ratio is less than 0.13. This excess ^<24>(Mg) can be evidence for the heterogeneity of the primordial solar nebula. departmental bulletin paper

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