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 https://doi.org/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 |
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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: | https://doi.org/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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