Articles | Volume 4, issue 2
Geochronology, 4, 629–640, 2022
https://doi.org/10.5194/gchron-4-629-2022
Geochronology, 4, 629–640, 2022
https://doi.org/10.5194/gchron-4-629-2022
Research article
27 Oct 2022
Research article | 27 Oct 2022

A revised alpha-ejection correction calculation for (U–Th) ∕ He thermochronology dates of broken apatite crystals

John J. Y. He and Peter W. Reiners

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Cited articles

Ault, A. K. and Flowers, R. M.: Is apatite UTh zonation information necessary for accurate interpretation of apatite (UTh)/He thermochronometry data?, Geochim. Cosmochim. Ac., 79, 60–78, https://doi.org/10.1016/j.gca.2011.11.037, 2012. 
Beucher, R., Brown, R. W., Roper, S., Stuart, F., and Persano, C.: Natural age dispersion arising from the analysis of broken crystals: Part II. Practical application to apatite (U-Th)/He thermochronometry, Geochim. Cosmochim. Ac., 120, 395–416, https://doi.org/10.1016/j.gca.2013.05.042, 2013. 
Brown, R. W., Beucher, R., Roper, S., Persano, C., Stuart, F., and Fitzgerald, P.: Natural age dispersion arising from the analysis of broken crystals. Part I: Theoretical basis and implications for the apatite (U-Th)/He thermochronometer, Geochim. Cosmochim. Ac., 122, 478–497, https://doi.org/10.1016/j.gca.2013.05.041, 2013. 
Cooperdock, E. H. G., Ketcham, R. A., and Stockli, D. F.: Resolving the effects of 2-D versus 3-D grain measurements on apatite (U–Th) / He age data and reproducibility, Geochronology, 1, 17–41, https://doi.org/10.5194/gchron-1-17-2019, 2019. 
Dana, E. S.: A Textbook on Mineralogy, John Wiley, New York, ISBN: 978-0471193050, 1963, 
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Short summary
Apatite helium thermochronology is a method that dates the time at which a rock (and the apatite crystals contained within) cooled below a certain temperature by measuring radioactive parent isotopes (uranium and thorium) and daughter isotopes (helium). This paper proposes a revision to a commonly used calculation that corrects raw data to account for instances when the analyzed apatite crystals are fragmented. It demonstrates the improved accuracy and precision of the proposed revision.