Spalogenic rare gases in iron meteorites with anomalous silver
- Creators
- Villa, I. M.
- Huneke, J. C.
-
Wasserburg, G. J.
Abstract
He, Ne, and Ar have been measured in seven iron meteorites for which anomalous Ag isotopic compositions were reported, in order to determine if ^(107)Ag excesses could be related to galactic cosmic-ray bombardment of these meteorites. Our results show that no correlation exists between ^(107)Ag excess and either the fluence or the energy spectrum of the particles producing spallogenic rare gases. Cosmic-ray-produced ^(107)Ag estimated from ^(38)Ar concentrations can account for only about 1% of the observed excess. Elimination of cosmic-ray bombardment as a production mechanism for ^(107)Ag excess strengthens the conclusion that the excess ^(107)Ag is the decay product of short-lived ^(107)Pd (τ_(1/2)=6.5Myr). The iron meteorite Piñon is shown to contain trapped rare gases with ^4He/^(20)Ne∼600.
Additional Information
© 1981 Elsevier Scientific Publishing Company. Received January 8, 1981; Revised version received August 12, 1981. This work was supported by NASA grant NGL 05-002-188 and NSF grant PHY 792-3638. One of us (I.M.V.) acknowledges a grant from Foundation Blanceflor Boncompagni-Lodovisi, Stockholm. D. Phinney, R. Reedy, and T. Kaiser provided thorough and constructive reviews leading to substantial improvement of the manuscript.Additional details
- Eprint ID
- 40981
- Resolver ID
- CaltechAUTHORS:20130828-144929479
- NGL 05-002-188
- NASA
- PHY 792-3638
- NSF
- Foundation Blanceflor
- Created
-
2013-09-20Created from EPrint's datestamp field
- Updated
-
2020-03-09Created from EPrint's last_modified field
- Other Numbering System Name
- Lunatic Asylum Lab
- Other Numbering System Identifier
- 374