Supra-canonical Al-26/Al-27 and the residence time of CAIs in the solar protoplanetary disk

Young, E. D. and Simon, J. I. and Galy, A. and Russell, S. S. and Tonui, E. and Lovera, O. (2005) Supra-canonical Al-26/Al-27 and the residence time of CAIs in the solar protoplanetary disk. Science, 308 (5719). pp. 223-227. DOI 10.1126/science.1108140

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Abstract

The canonical initial 26Al/27Al ratio of 4.5 x 10-5 has been a fiducial marker for the beginning of the solar system. Laser ablation and whole-rock multiple-collector inductively coupled plasma-source mass spectrometry magnesium isotope analyses of calcium- and aluminum-rich inclusions (CAIs) from CV3 meteorites demonstrate that some CAIs had initial 26Al/27Al values at least 25% greater than canonical and that the canonical initial 26Al/27Al cannot mark the beginning of solar system formation. Using rates of Mg diffusion in minerals, we find that the canonical initial 26Al/27Al is instead the culmination of thousands of brief high-temperature events incurred by CAIs during a 105-year residence time in the solar protoplanetary disk.

Item Type:	Article
Uncontrolled Keywords:	2005 AREP IA47 2005 P
Subjects:	05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions:	05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Journal or Publication Title:	Science
Volume:	308
Page Range:	pp. 223-227
Identification Number:	10.1126/science.1108140
Depositing User:	Sarah Humbert
Date Deposited:	09 Aug 2010 16:32
Last Modified:	23 Jul 2013 10:00
URI:	http://eprints.esc.cam.ac.uk/id/eprint/1886

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