Articles | Volume 4, issue 1
https://doi.org/10.5194/gchron-4-353-2022
https://doi.org/10.5194/gchron-4-353-2022
Research article
 | 
08 Jun 2022
Research article |  | 08 Jun 2022

In situ Lu–Hf geochronology of calcite

Alexander Simpson, Stijn Glorie, Martin Hand, Carl Spandler, Sarah Gilbert, and Brad Cave

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Cited articles

Barfod, G. H., Krogstad, E. J., Frei, R., and Albarède, F.: Lu-Hf and PbSL geochronology of apatites from Proterozoic terranes: A first look at Lu-Hf isotopic closure in metamorphic apatite, Geochim. Cosmochim. Ac., 69, 1847–1859, https://doi.org/10.1016/j.gca.2004.09.014, 2005. 
Barker, S. L. L., Bennett, V. C., Cox, S. F., Norman, M. D., and Gagan, M. K.: Sm–Nd, Sr, C and O isotope systematics in hydrothermal calcite–fluorite veins: Implications for fluid–rock reaction and geochronology, Chem. Geol., 268, 58–66, https://doi.org/10.1016/j.chemgeo.2009.07.009, 2009. 
Basson, I., Lourens, P., Paetzold, H.-D., Thomas, S., Brazier, R., and Molabe, P.: Structural analysis and 3D modelling of major mineralizing structures at the Phalaborwa copper deposit, Ore Geol. Rev., 83, 30–42, 2017. 
Brugger, J., Liu, W., Etschmann, B., Mei, Y., Sherman, D. M., and Testemale, D.: A review of the coordination chemistry of hydrothermal systems, or do coordination changes make ore deposits?, Chem. Geol., 447, 219–253, https://doi.org/10.1016/j.chemgeo.2016.10.021, 2016. 
Cherniak, D. J.: An experimental study of strontium and lead diffusion in calcite, and implications for carbonate diagenesis and metamorphism, Geochim. Cosmochim. Ac., 61, 4173–4179, https://doi.org/10.1016/S0016-7037(97)00236-6, 1997. 
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Short summary
The article demonstrates a new technique that can be used to determine the age of calcite crystallisation using the decay of 176Lu to 176Hf. The technique is novel because (a) Lu–Hf radiometric dating is rarely applied to calcite and (b) this is the first instance where analysis has been conducted by ablating the sample with a laser beam rather than bulk dissolution. By using laser ablation the original context of the sample is preserved.