Articles | Volume 1, issue 1
https://doi.org/10.5194/gchron-1-17-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-1-17-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Sep 2019
Research article |
| 26 Sep 2019
| 26 Sep 2019
Resolving the effects of 2-D versus 3-D grain measurements on apatite (U–Th) ∕ He age data and reproducibility
Department of Geological Sciences, University of Texas at Austin,
Austin, 78712, USA
Woods Hole Oceanographic Institution, Woods Hole, 02543, USA
now at: Department of Earth Sciences, University of Southern
California, Los Angeles, CA 90089, USA
Richard A. Ketcham
Department of Geological Sciences, University of Texas at Austin,
Austin, 78712, USA
Daniel F. Stockli
Department of Geological Sciences, University of Texas at Austin,
Austin, 78712, USA
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Latest update: 31 Oct 2025
Short summary
(U–Th) / He chronometry relies on accurate grain-specific size and shape measurements. Using > 100 apatite grains to compare
assumed2-D versus
true3-D grain shapes measured by a microscope and X-ray computed tomography, respectively, we find that volume and surface area both differ by ~ 25 % between the two techniques and directly affect mass and concentration measurements. But we found a very small effect on the FT correction (2 %) and no discernible impact on mean sample age or dispersion.
(U–Th) / He chronometry relies on accurate grain-specific size and shape measurements. Using...
