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Open-File Report 2014–1064

Noble Gas Isotopes in Mineral Springs within the Cascadia Forearc, Washington and Oregon

By Patricia A. McCrory, James E. Constantz, and Andrew G. Hunt


This U.S. Geological Survey report presents laboratory analyses along with field notes for a pilot study to document the relative abundance of noble gases in mineral springs within the Cascadia forearc of Washington and Oregon. Estimates of the depth to the underlying Juan de Fuca oceanic plate beneath the sample sites are derived from the McCrory and others (2012) slab model. Some of these springs have been previously sampled for chemical analyses (Mariner and others, 2006), but none currently have publicly available noble gas data. Helium isotope values as well as the noble gas values and ratios presented below will be used to determine the sources and mixing history of these mineral waters.

First posted April 3, 2014

For additional information, contact:
Contact Information, Menlo Park, Calif. Office—Earthquake Science Center
U.S. Geological Survey
345 Middlefield Road, MS 977
Menlo Park, CA 94025

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Suggested citation:

McCrory, P.A., Constantz, J.E., and Hunt, A.G., 2014, Noble gas isotopes in mineral springs within the Cascadia Forearc, Wasihington and Oregon: U.S. Geological Survey Open-File Report 2014-1064, 20 p.,

ISSN 2331-1258 (online)




Mineral Spring Sites Sampled for Noble Gas Isotopes


References Cited

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