Articles | Volume 4, issue 2
Geochronology, 4, 665–681, 2022
Geochronology, 4, 665–681, 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,, 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,, 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,, 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,, 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,, 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.