Geochronology
Geochronology
GChron
Articles | Volume 6, issue 2
Articles | Volume 6, issue 2
https://doi.org/10.5194/gchron-6-199-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-6-199-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 6, issue 2
Research article
 | 
10 Jun 2024
Research article |  | 10 Jun 2024

The Geometric Correction Method for zircon (U–Th) ∕ He chronology: correcting systematic error and assigning uncertainties to alpha-ejection corrections and eU concentrations

Spencer D. Zeigler, Morgan Baker, James R. Metcalf, and Rebecca M. Flowers

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Cited articles

Armstrong, E. M., Ault, A. K., Kaempfer, J. M., and Guenthner, W. R.: Connecting visual metamictization to radiation damage to expand applications of zircon (U Th)/He thermochronometry, Chem. Geol., 648, 121949, https://doi.org/10.1016/j.chemgeo.2024.121949, 2024. 
Ault, A. K., Guenthner, W. R., Moser, A. C., Miller, G. H., and Refsnider, K. A.: Zircon grain selection reveals (de)coupled metamictization, radiation damage, and He diffusivity, Chem. Geol., 490, 1–12, https://doi.org/10.1016/j.chemgeo.2018.04.023, 2018. 
Basler, L. C., Baughman, J. S., Fame, M. L., and Haproff, P. J.: Spatially variable syn- and post-Alleghanian exhumation of the central Appalachian Mountains from zircon (U-Th) / He thermochronology, Geosphere, 17, 1151–1169, https://doi.org/10.1130/GES02368.1, 2021. 
Baughman, J. S., Flowers, R. M., Metcalf, J. R., and Dhansay, T.: Influence of radiation damage on titanite He diffusion kinetics, Geochim. Cosmochim. Ac., 205, 50–64, https://doi.org/10.1016/j.gca.2017.01.049, 2017. 
BIPM, IEC, IFCC, ILAC, ISO, IUPAC, IUPAP, and OIML: International vocabulary of metrology – Basic and general concepts and associated terms (VIM), https://www.bipm.org/documents/20126/2071204/JCGM_200_2012.pdf/f0e1ad45-d337-bbeb-53a6-15fe649d0ff1 (last access: 29 November 2023), 2012. 
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Short summary
(U–Th)/He chronology relies on accurate measurements of zircon grain dimensions, but the systematic error and uncertainty associated with those measurements have been unquantified until now. We build on the work of Zeigler et al. (2023) and present the zircon Geometric Correction Method, a simple solution to correcting the error and quantifying the geometric uncertainty in eU and dates. Including this geometric correction and uncertainty matters for data evaluation and interpretation.
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