Resolving the effects of 2-D versus 3-D grain measurements on apatite (U–Th)&thinsp;∕&thinsp;He age data and reproducibility

Cooperdock, Emily H. G.; Ketcham, Richard A.; Stockli, Daniel F.

doi:https://doi.org/10.5194/gchron-1-17-2019

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.

https://doi.org/10.5194/gchron-1-17-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 1, issue 1

Research article

|

26 Sep 2019

Research article |

| 26 Sep 2019

Resolving the effects of 2-D versus 3-D grain measurements on apatite (U–Th) ∕ He age data and reproducibility

Emily H. G. Cooperdock, Richard A. Ketcham, and Daniel F. Stockli

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Final revised paper (published on 26 Sep 2019)
Supplement to the final revised paper
Preprint (discussion started on 27 May 2019)
Supplement to the preprint

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

- Printer-friendly version

- Supplement

RC1: 'Review', Christoph Glotzbach, 14 Jun 2019
- AC1: 'Response to Review from Glotzbach', Emily Cooperdock, 12 Aug 2019
RC2: 'gchron-2019-3 reviewer comments', Anonymous Referee #2, 17 Jun 2019
- AC2: 'Response to Reviewer 2', Emily Cooperdock, 12 Aug 2019
RC3: 'Referee comment on Cooperdock et al.', Anonymous Referee #3, 26 Jun 2019
- AC3: 'Response to Reviewer 3', Emily Cooperdock, 12 Aug 2019

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

ED: Publish subject to technical corrections (26 Aug 2019) by Cecile Gautheron

ED: Publish subject to technical corrections (26 Aug 2019) by Greg Balco (Editor)

AR by Emily Cooperdock on behalf of the Authors (02 Sep 2019) Manuscript

Post-review adjustments

AA: Author's adjustment | EA: Editor approval

AA by Emily Cooperdock on behalf of the Authors (23 Sep 2019) Author's adjustment Manuscript

EA: Adjustments approved (23 Sep 2019) by Cecile Gautheron

Short summary

(U–Th) / He chronometry relies on accurate grain-specific size and shape measurements. Using > 100 apatite grains to compare assumed 2-D versus true 3-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.