Articles | Volume 4, issue 2
Geochronology, 4, 665–681, 2022
https://doi.org/10.5194/gchron-4-665-2022
Geochronology, 4, 665–681, 2022
https://doi.org/10.5194/gchron-4-665-2022
Research article
22 Nov 2022
Research article | 22 Nov 2022

U and Th content in magnetite and Al spinel obtained by wet chemistry and laser ablation methods: implication for (U–Th) ∕ He thermochronometer

Marianna Corre et al.

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Cited articles

Bassal, F., Roques J., Corre, M., Brunet, F., Ketcham, R., Schwartz, S., Tassan-Got, L., and Gautheron, C.: Role of defects and radiation damage on He diffusion in magnetite: implication for (U–Th) / He thermochronology, Minerals, 12, 590, https://doi.org/10.3390/min12050590, 2022. 
Blackburn, T. J., Stockli, D. F., and Walker, J. D.: Magnetite (U–Th) / He dating and its application to the geochronology of intermediate to mafic volcanic rocks, Earth Planet. Sci. Lett., 259, 360–371, https://doi.org/10.1016/j.epsl.2007.04.044, 2007. 
Bolhar, R., Kamber, B. S., Moorbath, S., Fedo, C. M., and Whitehouse, M. J.: Characterisation of early Archaean chemical sediments by trace element signatures, Earth Planet. Sci. Lett., 222, 43–60, https://doi.org/10.1016/j.epsl.2004.02.016, 2004. 
Bolhar, R., Hofmann, A., Siahi, M., Feng, Y., and Delvigne, C.: A trace element and Pb isotopic investigation into the provenance and deposition of stromatolitic carbonates, ironstones and associated shales of the ∼3.0 Ga Pongola Supergroup, Kaapvaal Craton, Geochim. Cosmochim. Acta, 158, 57–78, https://doi.org/10.1016/j.gca.2015.02.026, 2015. 
Colás, V., González-Jiménez, J. M., Griffin, W. L., Fanlo, I., Gervilla, F., O'Reilly, S., Pearson, N. J., Kerestedjian, T., and Proenza, J. A.: Fingerprints of metamorphism in chromite: New insights from minor and trace elements, Chem. Geol., 389, 137–152, https://doi.org/10.1016/j.chemgeo.2014.10.001, 2014. 
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Short summary
This study is focused on the accurate measurement of U and Th by wet chemistry and laser ablation methods to improve (U–Th)/He dating of magnetite and spinel. The low U–Th content and the lack of specific U–Th standards significantly limit the accuracy of (U–Th)/He dating. Obtained U–Th results on natural and synthetic magnetite and aluminous spinel samples analyzed by wet chemistry methods and LA-ICP-MS sampling have important implications for the (U–Th)/He method and dates interpretation.