Articles | Volume 5, issue 1
https://doi.org/10.5194/gchron-5-127-2023
https://doi.org/10.5194/gchron-5-127-2023
Research article
 | 
03 Apr 2023
Research article |  | 03 Apr 2023

Chemical abrasion: the mechanics of zircon dissolution

Alyssa J. McKanna, Isabel Koran, Blair Schoene, and Richard A. Ketcham

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Cited articles

Anderson, A. J., Hodges, K. V., and van Soest, M. C.: Empirical constraints on the effects of radiation damage on helium diffusion in zircon, Geochim. Cosmochim. Ac., 218, 308–322, https://doi.org/10.1016/j.gca.2017.09.006, 2017. 
Anderson, A. J., Hanchar, J. M., Hodges, K. V., and van Soest, M. C.: Mapping radiation damage zoning in zircon using Raman spectroscopy: Implications for zircon chronology, Chem. Geol., 538, 119494, https://doi.org/10.1016/j.chemgeo.2020.119494, 2020a. 
Anderson, A. J., van Soest, M. C., Hodges, K. V., and Hanchar, J. M.: Helium diffusion in zircon: Effects of anisotropy and radiation damage revealed by laser depth profiling, Geochim. Cosmochim. Ac., 274, 45–62, https://doi.org/10.1016/j.gca.2020.01.049, 2020b. 
Barley, M. and Pickard, A.: An extensive, crustally-derived, 3325 to 3310 ma silicic volcanoplutonic suite in the eastern Pilbara craton: evidence from the Kelly Belt, Mcphee Dome and Corunna Downs Batholith, Precambrian Res., 96, 41–62, 1999. 
Basu, A. R., Chakrabarty, P., Szymanowski, D., Ibañez-Mejia, M., Schoene, B., Ghosh, N., and Georg, R. B.: Widespread silicic and alkaline magmatism synchronous with the Deccan Traps flood basalts, India, Earth Planet. Sc. Lett., 552, 116616, https://doi.org/10.1016/j.epsl.2020.116616, 2020. 
Short summary
Acid leaching is commonly used to remove damaged portions of zircon crystals prior to U–Pb dating. However, a basic understanding of the microstructural processes that occur during leaching is lacking. We present the first 3D view of zircon dissolution based on X-ray computed tomography data acquired before and after acid leaching. These data are paired with images of etched grain surfaces and Raman spectral data. We also reveal exciting opportunities for imaging radiation damage zoning in 3D.