Affiliation:
1. Physical Research Laboratory, Ahmedabad 380 009, India.
Abstract
Aluminum-magnesium isotopic analysis of plagioclase in the eucrite Piplia Kalan, with
27
Al/
24
Mg ratio between 2000 to 7000, reveals the presence of excess magnesium-26 resulting from in situ decay of the short-lived nuclide aluminum-26. This observation confirms aluminum-26 as a plausible heat source for melting and differentiation of the eucrite parent body in particular and for planetesimals in general. The inferred initial abundance of
26
Al/
27
Al of (7.5 ± 0.9) × 10
−7
indicates that melting, differentiation, and crust formation in the parent body of Piplia Kalan was complete within 5 million years of the formation of the solar system.
Publisher
American Association for the Advancement of Science (AAAS)
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