1988•Journal of the Mass Spectrometry Society of JapanOpen access
Ion microprobe and electron microprobe studies on magnesium isotopic abundances in olivine minerals from the Allende carbonaceous chondrite.
Hitomi Sakaguchi, S. Matsunami, Hiroshi Nishimura, Hideo Takeshi, Chiaki Uyeda, Jun Okano
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Abstract
Isotope ratios of 24Mg/25Mg and 26Mg/25Mg have been measured by an ion microprobe mass analyzer in three specimens of forsterite-rich olivine from the Allende carbonaceous chondrite (Fo95, Fo85 and Fo98). Prior to isotopic analyses, the mineral compositions of these specimens were identified by an electron probe microanalyzer. The ratios were compared with those for a terrestrial laboratory standard olivine (Fo94). About 5 permil excesses of 24Mg were found in two of those forsterite-rich olivine specimens from Allende analyzed. These excesses of 24Mg can be one of the evidences of the heterogeneity of the primordial solar nebula.
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