Half-life and initial Solar System abundance of <sup>146</sup> Sm determined from the oldest andesitic meteorite-Reference-Cited by-同舟云学术

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

Published:2022-03-15 Issue:12 Volume:119 Page:
ISSN:0027-8424
Container-title:Proceedings of the National Academy of Sciences
language:en
Short-container-title:Proc. Natl. Acad. Sci. U.S.A.

Author:

Fang Linru¹^ORCID,Frossard Paul²,Boyet Maud²,Bouvier Audrey³^ORCID,Barrat Jean-Alix⁴⁵^ORCID,Chaussidon Marc¹^ORCID,Moynier Frederic¹^ORCID

Affiliation:

1. Université de Paris, Institut de Physique du Globe de Paris, CNRS, F-75005 Paris, France

2. CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, Université Clermont Auvergne, F-63000 Clermont-Ferrand, France

3. Bayerisches Geoinstitut, Universität Bayreuth, 95447 Bayreuth, Germany

4. CNRS, IRD, Institut Français de Recherche pour l'Exploitation de la Mer, LEMAR, Univ Brest, F-29280 Plouzané, France

5. Institut Universitaire de France, 75231 Paris, France

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.

Publisher

Proceedings of the National Academy of Sciences

Subject

Multidisciplinary

Link

https://pnas.org/doi/pdf/10.1073/pnas.2120933119

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