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^(39)Ar recoil losses and presolar ages in Allende inclusions

Villa, I. M. and Huneke, J. C. and Wasserburg, G. J. (1983) ^(39)Ar recoil losses and presolar ages in Allende inclusions. Earth and Planetary Science Letters, 63 (1). pp. 1-12. ISSN 0012-821X. https://resolver.caltech.edu/CaltechAUTHORS:20130910-134304904

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Abstract

Ar analyses are reported for five coarse-grained, Ca-Al-rich inclusions from the Allende meteorite. The samples were neutron-irradiated in individual evacuated ampoules, and the Ar gas in the ampoules as well as the samples was analyzed. A large fraction (up to 60%) of the ^(39)Ar from ^(39)K (n, p) reactions was lost out of the inclusions into the ampoules. The ^(39)Ar losses resulted in substantial increases in the apparent ^(40)Ar-^(39)Ar ages of the samples. ^(39)Ar recoil loss during neutron-irradiation is a major effect and must be accounted for in ^(40)Ar-^(39)Ar dating. All of the Allende inclusions studied contained substantial trapped ^(36)Ar. The origin of the trapped ^(36)Ar is unknown, and the possible presence of trapped ^(40)Ar cannot be excluded. Ar measurements on Allende inclusions which have yielded anomalously old ages must be re-examined in the context of ^(39)Ar recoil loss and possible contributions of trapped ^(40)Ar. Allende inclusions appear on both accounts to be poor candidates to search for relicts of presolar materials with well-defined K/Ar ages.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0012-821X(83)90017-1DOIArticle
http://www.sciencedirect.com/science/article/pii/0012821X83900171PublisherArticle
ORCID:
AuthorORCID
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1983 Elsevier Science Publishers B.V. Received July 19, 1982; Revised version accepted January 11, 1983. D. and T. Papanastassiou provided lodging for one of us. Evelyn Brown provided stability to the Lunatic Asylum inmates. Comments from the reviewers and the editorial review by F. Begemann aided us in clarifying several issues. This work was supported by NASA grant NGL 05-002-188 and NSF grant PHY 81-19964.
Funders:
Funding AgencyGrant Number
NASA05-002-188
NSFPHY 81-19964
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences3785
Lunatic Asylum Lab422
Issue or Number:1
Record Number:CaltechAUTHORS:20130910-134304904
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130910-134304904
Official Citation:I.M. Villa, J.C. Huneke, G.J. Wasserburg, 39Ar recoil losses and presolar ages in Allende inclusions, Earth and Planetary Science Letters, Volume 63, Issue 1, April 1983, Pages 1-12, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(83)90017-1. (http://www.sciencedirect.com/science/article/pii/0012821X83900171)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41213
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Sep 2013 23:03
Last Modified:09 Mar 2020 13:19

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