The Beginning: Swift and Violent
Author: Wood, J.A.
Source: Space Science Reviews, Volume 92, Numbers 1-2, 2000 , pp. 97-112(16)
Abstract:Radiometric dating shows that the earliest steps in forming the substance of meteorites and assembling it into planetesimals occurred in a very short interval of time, 1–2 Ma. This study shows that rapid formation is also dictated by the need to use short-lived ^26Al (half-life T_1/2=0.74 Ma) as a heat source to metamorphose and in some cases melt the meteorite parent bodies after they accreted. The earliest events in solar system history dated by cosmochemists, formation at high temperatures of the Ca,Al-rich inclusions that occur in chondritic meteorites, probably occurred during the most energetic stage of protosolar disk evolution, as the protosun neared its present mass and infall drew to a close.
Document Type: Regular Paper
Affiliations: Harvard-Smithsonian Center for Astrophysics, Cambridge MA 02138, USA
Publication date: 2000-01-01