Large heterogeneous Mg-26 excesses in a hibonite from the Murchison meteorite

Details Large heterogeneous Mg-26 excesses in a hibonite from the Murchison meteorite Large heterogeneous Mg-26 excesses in a hibonite from the Murchison meteorite

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.327..689i&link_type=abstract

Nature (ISSN 0028-0836), vol. 327, June 25, 1987, p. 689-692.

Computer Science

5

Aluminum 26, Magnesium Isotopes, Meteoritic Composition, Murchison Meteorite, Interstellar Matter, Radioactive Age Determination, Refractory Materials, Temperature Effects, Temporal Distribution, Meteorites, Magnesium 26, Heterogeneity, Hibonite, Murchison, Decay, Cm2 Meteorites, Stony Meteorites, Carbonaceous Chondrites, Inclusions, Isotopes, Models, Refractory Material, Enrichment, Samples, Meteorite, Laboratory Studies, Analysis, Fractionation, Comparisons, Distilation, Aluminum 26

Scientific paper

Measurements of Mg-26 excesses approaching 400 percent are reported in a hibonite, grain 7-971, from the Murchison carbonaceous chondrite. The excesses are not homogeneous: the core is enriched by 355 + or - 6 percent, at the 95 percent confidence limit, whereas an analysis nearer the edge has a lower excess of 145 + or - 6 percent. The magnesium in 7-971 is also significantly mass-fractionated, with the heavy isotopes enriched relative to terrestrial compositions, and this is a possible signature of a distillation event. The magnesium isotope systematics of this hibonite are compatible with models incorporating either in situ Al-26 decay and/or chemical memory of exotic Mg, but the Al-Mg system was probably disturbed in a later thermal event.

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