Half-life and initial Solar System abundance of 146 Sm determined from the oldest andesitic meteorite - Archive ouverte HAL Access content directly
Journal Articles Proceedings of the National Academy of Sciences of the United States of America Year : 2022

Half-life and initial Solar System abundance of 146 Sm determined from the oldest andesitic meteorite

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Linru Fang
Maud Boyet
Audrey Bouvier

Abstract

Significance 146 Sm- 142 Nd radioactive systematics can provide constraints on the timing of early differentiation processes on Earth, Moon, and Mars. The uncertainties related to the initial abundance and half-life of the extinct isotope 146 Sm impede the interpretation of the 146 Sm- 142 Nd systematics of planetary materials. The accurate determinations of Sm, Nd, and Mg isotopic compositions of the oldest “andesitic” achondrite Erg Chech 002 (EC 002) define a crystallization age of 1.8 Myr after the formation of the Solar System and provide the most accurate and reliable initial ratio of 146 Sm/ 144 Sm for the Solar System at 0.00840 ± 0.00032 using a 146 Sm half-life of 103 Ma, making EC 002 an anchor for 146 Sm- 142 Nd systematics for Earth and planetary materials.
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Origin : Publication funded by an institution

Dates and versions

hal-03862329 , version 1 (21-11-2022)

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Attribution - NonCommercial - NoDerivatives - CC BY 4.0

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Linru Fang, Paul Frossard, Maud Boyet, Audrey Bouvier, Jean-Alix Barrat, et al.. Half-life and initial Solar System abundance of 146 Sm determined from the oldest andesitic meteorite. Proceedings of the National Academy of Sciences of the United States of America, 2022, 119 (12), ⟨10.1073/pnas.2120933119⟩. ⟨hal-03862329⟩
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