Geochronology
Geochronology
GChron
Articles | Volume 7, issue 3
Articles | Volume 7, issue 3
https://doi.org/10.5194/gchron-7-255-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-7-255-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 7, issue 3
Research article
 | 
04 Aug 2025
Research article |  | 04 Aug 2025

Cosmogenic 3He dating of olivine with tightly retained mantle 3He, Volcano Mountain, Yukon

Jessica M. Mueller, Jeffrey D. Bond, Kenneth A. Farley, and Brent C. Ward

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Short summary
We used step heating to separate cosmogenic 3He from mantle 3He in olivine xenocrysts in which the mantle helium component is in high concentration after sample powdering. By isolating the matrix-sited cosmogenic 3He at low temperature, we were able to date four different lava flows on Volcano Mountain, the youngest eruptive center in the Fort Selkirk volcanic province in Yukon, Canada.  The four flows, including the stratigraphically youngest on the mountain, erupted coevally, at 10.5 ± 1.7 ka.
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