Geochronology
Geochronology
GChron
Articles | Volume 6, issue 4
Articles | Volume 6, issue 4
https://doi.org/10.5194/gchron-6-553-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-6-553-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 6, issue 4
Research article
 | 
25 Oct 2024
Research article |  | 25 Oct 2024

U and Th zonation in apatite observed by synchrotron X-ray fluorescence tomography and implications for the (U–Th) ∕ He system

Francis J. Sousa, Stephen E. Cox, E. Troy Rasbury, Sidney R. Hemming, Antonio Lanzirotti, and Matthew Newville

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Abbey, A. L., Wildman, M., Stevens Goddard, A. L., and Murray, K. E.: Thermal history modeling techniques and interpretation strategies: Applications using QTQt, Geosphere, 19, 493–530, https://doi.org/10.1130/ges02528.1, 2023. 
Ault, A. K. and Flowers, R. M.: Is apatite U–Th zonation information necessary for accurate interpretation of apatite (U–Th) / He thermochronometry data?, Geochim. Cosmochim. Ac., 79, 60-78, https://doi.org/10.1016/j.gca.2011.11.037, 2012. 
Boyce, J. W. and Hodges, K. V.: U and Th zoning in Cerro de Mercado (Durango, Mexico) fluorapatite: Insights regarding the impact of recoil redistribution of radiogenic 4He on (U–Th) / He thermochronology, Chem. Geol., 219, 261–274, https://doi.org/10.1016/j.chemgeo.2005.02.007, 2005. 
Chew, D. M. and Spikings, R. A.: Geochronology and Thermochronology Using Apatite: Time and Temperature, Lower Crust to Surface, Elements, 11, 189–194, https://doi.org/10.2113/gselements.11.3.189, 2015. 
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. 
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We have discovered a new way of measuring the three-dimensional distribution of radioactive elements in individual crystals by shining a very bright light on apatite crystals at the Advanced Photon Source at Argonne National Laboratory. This allows us to learn about the rates and timing of geologic processes and to help resolve problems that previously were unsolvable because we had no way to make this type of measurement.

 
 
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