Open AccessHalf-life and initial Solar System abundance of 146 Sm determined from the oldest andesitic meteorite
Author(s) -
Linru Fang,
Paul Frossard,
Maud Boyet,
Audrey Bouvier,
JeanAlix Barrat,
Marc Chaussidon,
Frédéric Moynier
Publication year - 2022
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.2120933119
Subject(s) - isochron , achondrite , meteorite , radiogenic nuclide , formation and evolution of the solar system , geology , solar system , planetary differentiation , abundance (ecology) , andesite , geochemistry , astrobiology , parent body , chondrite , physics , mantle (geology) , paleontology , biology , subduction , volcano , fishery , volcanic rock , mantle wedge , tectonics
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 isotope146 Sm impede the interpretation of the146 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 of146 Sm/144 Sm for the Solar System at 0.00840± 0.00032 using a146 Sm half-life of 103 Ma, making EC 002 an anchor for146 Sm-142 Nd systematics for Earth and planetary materials.