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^4He/^3He thermochronometry

Shuster, D. L. and Farley, K. A. and Sisterson, J. and Burnett, D. S. (2003) ^4He/^3He thermochronometry. Geochimica et Cosmochimica Acta, 67 (18). A436-A436. ISSN 0016-7037. https://resolver.caltech.edu/CaltechAUTHORS:20150507-085549131

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Abstract

We demonstrate a technique that uses classical diffusion theory to determine ^4He concentration profiles within minerals. This approach should prove useful for constraining the low temperature cooling histories of individual samples and for correcting (U-Th)/He ages for partial diffusive loss. To validate the method, we investigated apatites with independently constrained cooling histories. The minerals of interest were irradiated with 220 MeV protons to induce an artificial distribution of spallation ^3He. Our results indicate that proton-induced ^3He is uniformly distributed and that radiation damage associated with a proton fluence of ~5x10^(14) protons/cm^2 does not cause noticeable changes in He diffusion behavior. Proton-induced ^3He can therefore be used to establish He diffusion coefficients in minerals with insufficient natural helium for analysis or those in which the natural ^4He distribution is inhomogeneous. In addition, step heating ^4He/^3He analysis of a mineral with a uniform synthetic ^3He concentration provides a means to constrain its natural ^4He distribution that arose during ingrowth and diffusion over geologic time.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/S0016-7037(03)00513-1DOIArticle
http://www.sciencedirect.com/science/article/pii/S0016703703005131PublisherArticle
ORCID:
AuthorORCID
Farley, K. A.0000-0002-7846-7546
Burnett, D. S.0000-0001-9521-8675
Additional Information:© 2003 Elsevier B.V.
Issue or Number:18
Record Number:CaltechAUTHORS:20150507-085549131
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150507-085549131
Official Citation:Abstracts, Geochimica et Cosmochimica Acta, Volume 67, Issue 18, Supplement, September 2003, Pages 401-450, ISSN 0016-7037, http://dx.doi.org/10.1016/S0016-7037(03)00513-1. (http://www.sciencedirect.com/science/article/pii/S0016703703005131)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57317
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 May 2015 19:20
Last Modified:09 Mar 2020 13:18

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