Geochronology
Geochronology
GChron
Articles | Volume 3, issue 2
Articles | Volume 3, issue 2
https://doi.org/10.5194/gchron-3-395-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-3-395-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 3, issue 2
Research article
 | 
15 Jul 2021
Research article |  | 15 Jul 2021

Exposure dating of detrital magnetite using 3He enabled by microCT and calibration of the cosmogenic 3He production rate in magnetite

Florian Hofmann, Emily H. G. Cooperdock, A. Joshua West, Dominic Hildebrandt, Kathrin Strößner, and Kenneth A. Farley

Data sets

Elemental analyses and cosmogenic 3He measurements of bulk soil and detrital minerals from a soil near Whitewater, California, USA Florian Hofmann, Emily H. G. Cooperdock, A. Joshua West, Dominic Hildebrandt, Kathrin Strößner, and Kenneth A. Farley https://doi.org/10.26022/IEDA/112019

Detrital magnetite grains scanned to detect inclusions for cosmogenic 3He exposure dating Florian Hofmann, Emily H. G. Cooperdock, A. Joshua West, Dominic Hildebrandt, Kathrin Strößner, and Kenneth A. Farley https://doi.org/10.17612/hehj-w597

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Short summary
We use microCT scanning to improve the quality of 3He exposure ages measured in detrital magnetite. We show that the presence of inclusions can significantly increase the measured amount of 3He and thereby the exposure age. By prescreening magnetite with microCT and analyzing only inclusion-free grains, this problem can be avoided. We also calibrate the cosmogenic 3He production rate in magnetite relative to 10Be in quartz, which can be used for similar studies in the future.
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