Rapid condensation of the first Solar System solids.
condensation
isotopes
meteorites
protoplanetary disk
Journal
Proceedings of the National Academy of Sciences of the United States of America
ISSN: 1091-6490
Titre abrégé: Proc Natl Acad Sci U S A
Pays: United States
ID NLM: 7505876
Informations de publication
Date de publication:
19 Nov 2019
19 Nov 2019
Historique:
pubmed:
7
11
2019
medline:
7
11
2019
entrez:
6
11
2019
Statut:
ppublish
Résumé
Chondritic meteorites are composed of primitive components formed during the evolution of the Solar protoplanetary disk. The oldest of these components formed by condensation, yet little is known about their formation mechanism because of secondary heating processes that erased their primordial signature. Amoeboid Olivine Aggregates (AOAs) have never been melted and underwent minimal thermal annealing, implying they might have retained the conditions under which they condensed. We performed a multiisotope (O, Si, Mg) characterization of AOAs to constrain the conditions under which they condensed and the information they bear on the structure and evolution of the Solar protoplanetary disk. High-precision silicon isotopic measurements of 7 AOAs from weakly metamorphosed carbonaceous chondrites show large, mass-dependent, light Si isotope enrichments (-9‰ < δ
Identifiants
pubmed: 31685614
pii: 1912479116
doi: 10.1073/pnas.1912479116
pmc: PMC6876230
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
23461-23466Informations de copyright
Copyright © 2019 the Author(s). Published by PNAS.
Déclaration de conflit d'intérêts
The authors declare no competing interest.
Références
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Proc Natl Acad Sci U S A. 2018 Jul 17;115(29):7497-7502
pubmed: 29967181
Rapid Commun Mass Spectrom. 2019 Oct 30;33(20):1589-1597
pubmed: 31237970