The Beginning: Swift and Violent |
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Authors: | John A Wood |
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Institution: | (1) Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA |
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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.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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