A Late Episode of Irradiation in the Early Solar System: Evidence from Extinct ^(36)Cl and ^(26)Al in Meteorites
Abstract
Late-formed halogen-rich phases in a refractory inclusion and a chondrule from the Allende meteorite exhibit large ^(36)S excesses that linearly correlate with the chlorine concentration, providing strong evidence in support of the existence of the short-lived nuclide ^(36)Cl (mean life of 0.43 Myr) in the early solar system. The inferred ^(36)Cl/^(35)Cl ratios at the time when these phases formed are very high (~4 × 10^(-6)) and essentially the same for the inclusion and the chondrule and confirm the earlier report of ^(36)S excess in another meteorite. In addition, the ^(36)Cl is decoupled from ^(26)Al. The observed and any possible higher levels of ^(36)Cl cannot be the result of a supernova or AGB stellar source but require a late episode of energetic particle bombardment by the early Sun, in support of the arguments based on the previous discovery of ^(10)Be. It is now clear that a blend of several sources is required to explain the short-lived nuclei when the solar system formed.
Additional Information
© 2006 American Astronomical Society. Received 2005 October 7; accepted 2005 November 22. This work was supported by Chinese National Natural Science Foundation for Distinguished Young Scholars (grant 40325009), by the "One-Hundred-Talent Program" of the Chinese Academy of Sciences, by the Minor Planet Foundation of China, by DOE grant DE-FG-03-88ER13851 (G. J. W.), and by a NASA grant NNG 05GH3736 (L. A. L./Y. G.). The terrestrial sodalite sample used in this study was prepared by Xin Hua. The authors wish to thank M. Busso for a detailed constructive and critical review. This is Caltech Division of Geological and Planetary Science Contribution 9133(1121).Attached Files
Published - 0004-637X_640_1_525.pdf
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Additional details
- Eprint ID
- 42963
- Resolver ID
- CaltechAUTHORS:20131211-141250305
- 40325009
- National Natural Science Foundation of China
- Chinese Academy of Sciences One Hundred Talents Program
- Minor Planet Foundation of China
- DE-FG-03-88ER13851
- Department of Energy (DOE)
- NNG 05GH3736
- NASA
- Created
-
2013-12-11Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences
- Other Numbering System Name
- Lunatic Asylum Lab
- Other Numbering System Identifier
- 1121