Early formation of planetary building blocks inferred from Pb isotopic ages of chondrules.

Autor:	Bollard J; Centre for Star and Planet Formation, University of Copenhagen, Copenhagen, Denmark., Connelly JN; Centre for Star and Planet Formation, University of Copenhagen, Copenhagen, Denmark., Whitehouse MJ; Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden., Pringle EA; Institut de Physique du Globe de Paris, Université Paris Diderot, Sorbonne Paris Cité, Paris, France., Bonal L; Institut de Planétologie et d'Astrophysique de Grenoble, Grenoble, France., Jørgensen JK; Centre for Star and Planet Formation, University of Copenhagen, Copenhagen, Denmark., Nordlund Å; Centre for Star and Planet Formation, University of Copenhagen, Copenhagen, Denmark., Moynier F; Institut de Physique du Globe de Paris, Université Paris Diderot, Sorbonne Paris Cité, Paris, France., Bizzarro M; Centre for Star and Planet Formation, University of Copenhagen, Copenhagen, Denmark.; Institut de Physique du Globe de Paris, Université Paris Diderot, Sorbonne Paris Cité, Paris, France.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2017 Aug 09; Vol. 3 (8), pp. e1700407. Date of Electronic Publication: 2017 Aug 09 (Print Publication: 2017).
DOI:	10.1126/sciadv.1700407
Abstrakt:	The most abundant components of primitive meteorites (chondrites) are millimeter-sized glassy spherical chondrules formed by transient melting events in the solar protoplanetary disk. Using Pb-Pb dates of 22 individual chondrules, we show that primary production of chondrules in the early solar system was restricted to the first million years after the formation of the Sun and that these existing chondrules were recycled for the remaining lifetime of the protoplanetary disk. This finding is consistent with a primary chondrule formation episode during the early high-mass accretion phase of the protoplanetary disk that transitions into a longer period of chondrule reworking. An abundance of chondrules at early times provides the precursor material required to drive the efficient and rapid formation of planetary objects via chondrule accretion.
Databáze:	MEDLINE
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