>Dear Isogeochem folks,
>I am working on a project in the western Yellowstone/eastern Island Park
>region in Idaho investigating recharge to the springs feeding the Henrys
>Fork of the Snake River.  I have been attempting to age date the water
>using tritium/helium3 ratios but the large amount of mantle derived helium
>4 in the samples have made this problematic.
>Could any of you suggest literature or current studies that I might look at
>to investigate helium 4 further?
>Thanks very much,
>Lyn Benjamin

Give a look to :

Craig H., Lupton J. E., Welhan J. A., and Poreda R. (1978) Helium isotope
ratios in Yellowstone and Lassen Park volcanic gases. Geophysical Research
Letters 5, 897-900.

Sorey M. L., Kennedy B. M., Evans W. C., Farrar C. D., and Suemnicht G. A.
(1993) Helium isotope and gas discharge variations associated with crustal
unrest in long valley caldera, california, 1989-1992. Journal of
Geophysical Research-Solid Earth 98, 15871-15889.


Search literature of Kennedy B.M. (he work at Berkeley). He did a lot of
work on noble gasesin the Yellowstone Park.

Regards

Daniele

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Dr. Daniele L. Pinti
Laboratoire de Geochronologie Multi-Techniques UPS-IPGP
Departement des Sciences de la Terre
Batiment 504, 1 etage
Universite Paris-Sud
F-91405 ORSAY CEDEX (France)

Phone +33 01 69 15 67 73
Fax + 33 01 69 15 48 91
E-mail [log in to unmask]
WWW http://pinti.geol.u-psud.fr
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