Computer Science
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35...85m&link_type=abstract
Meteoritics & Planetary Science, vol. 35, no. 1, pp. 85-94 (2000).
Computer Science
Scientific paper
The Mg isotope composition in five barred olivine (BO) chondrules, one coarse-grained rim of BO chondrule, a relic spinel in BO chondrule, one skeletal olivine chondrule similar to BO chondrule in mineralogy and composition, and two non-BO chondrules from the Allende meteorite has been measured by thermal ionization mass spectrometry. The Mg isotopes are not fractionated and within terrestrial standard values (+/-2.0 per amu) in seven of the analyzed eight ferromagnesian chondrules. A clump of relic spinel grain and its host BO chondrule R-11 give well resolvable Mg fractionations which show an enrichment of the heavier isotopes, up to +2.5 per amu. The Mg isotopic compositions of coarse-grained rim are identical to those of the host chondrule with barred olivine texture. The results imply that ferromagnesian and refractory precursor components of Allende chondrule may have been formed from isotopically heterogeneous reservoirs. In the nebula region where Allende chondrules formed, recycling of chondrules and multiple high-temperature heating did not significantly alter the chemical and isotopic memory of earlier generations.
Fujita Takashi
Misawa Keiji
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