Igneous meteorites suggest Aluminium-26 heterogeneity in the early Solar Nebula

Evgenii Krestianinov (), Yuri Amelin, Qing-Zhu Yin, Paige Cary, Magdalena H. Huyskens, Audrey Miller, Supratim Dey, Yuki Hibiya, Haolan Tang, Edward D. Young, Andreas Pack and Tommaso Rocco
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Evgenii Krestianinov: Australian National University
Yuri Amelin: Australian National University
Qing-Zhu Yin: University of California, Davis
Paige Cary: University of California, Davis
Magdalena H. Huyskens: University of California, Davis
Audrey Miller: University of California, Davis
Supratim Dey: University of California, Davis
Yuki Hibiya: University of Tokyo
Haolan Tang: University of California, Los Angeles
Edward D. Young: University of California, Los Angeles
Andreas Pack: Georg-August-Universität Göttingen
Tommaso Rocco: Georg-August-Universität Göttingen

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract The short-lived radionuclide aluminium-26 (26Al) isotope is a major heat source for early planetary melting. The aluminium-26 – magnesium-26 (26Al-26Mg) decay system also serves as a high-resolution relative chronometer. In both cases, however, it is critical to establish whether 26Al was homogeneously or heterogeneously distributed throughout the solar nebula. Here we report a precise lead-207 – lead-206 (207Pb-206Pb) isotopic age of 4565.56 ± 0.12 million years (Ma) for the andesitic achondrite Erg Chech 002. Our analysis, in conjunction with published 26Al-26Mg data, reveals that the initial 26Al/27Al in the source material of this achondrite was notably higher than in various other well-preserved and precisely dated achondrites. Here we demonstrate that the current data clearly indicate spatial heterogeneity of 26Al by a factor of 3-4 in the precursor molecular cloud or the protoplanetary disk of the Solar System, likely associated with the late infall of stellar materials with freshly synthesized radionuclides.

Date: 2023
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DOI: 10.1038/s41467-023-40026-1

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