2022
DOI: 10.21203/rs.3.rs-1957266/v1
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U-Pb age of the oldest achondrite points to 26Al heterogeneity in the early Solar System

Abstract: The homogeneity of distribution of radioisotope 26Al in the early solar nebula, a major heat source for early planetary differentiation and foundational assumption to high resolution cosmochronology, remains debatable. Here we report a precise Pb-isotopic age of 4565.56±0.12 million years (Ma) for the recently discovered andesitic achondrite Erg Chech 002. Combining this age with published high-precision 26Al-26Mg data, we demonstrate that the initial 26Al/27Al in the source material of this achondrite was dis… Show more

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