Articles | Volume 35, issue 6
https://doi.org/10.5194/ejm-35-1009-2023
https://doi.org/10.5194/ejm-35-1009-2023
Research article
 | 
16 Nov 2023
Research article |  | 16 Nov 2023

Li–Na interdiffusion and diffusion-driven lithium isotope fractionation in pegmatitic melts

Christian R. Singer, Harald Behrens, Ingo Horn, Martin Oeser, Ralf Dohmen, and Stefan Weyer

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Cited articles

Baasner, A., Schmidt, B. C., Dupree, R., and Webb, S. L.: Fluorine speciation as a function of composition in peralkaline and peraluminous Na2O–CaO–Al2O3–SiO2 glasses: A multinuclear NMR study, Geochim. Cosmochim. Ac., 132, 151–169, https://doi.org/10.1016/j.gca.2014.01.041, 2014. 
Barnes, E. M., Weis, D., and Groat, L. A.: Significant Li isotope fractionation in geochemically evolved rare element-bearing pegmatites from the Little Nahanni Pegmatite Group, NWT, Canada, Lithos, 132/133, 21–36, https://doi.org/10.1016/j.lithos.2011.11.014, 2012. 
Bartels, A., Vetere, F., Holtz, F., Behrens, H., and Linnen, R. L.: Viscosity of flux-rich pegmatitic melts, Contrib. Mineral. Petrol., 162, 51–60, https://doi.org/10.1007/s00410-010-0582-3, 2011. 
Bartels, A., Behrens, H., Holtz, F., Schmidt, B. C., Fechtelkord, M., Knipping, J., Crede, L., Baasner, A., and Pukallus, N.: The effect of fluorine, boron and phosphorus on the viscosity of pegmatite forming melts, Chem. Geol., 346, 184–198, https://doi.org/10.1016/j.chemgeo.2012.09.024, 2013. 
Bartels, A., Behrens, H., Holtz, F., and Schmidt, B. C.: The effect of lithium on the viscosity of pegmatite forming liquids, Chem. Geol., 410, 1–11, https://doi.org/10.1016/j.chemgeo.2015.05.011, 2015. 
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Short summary
Li is a critical element that is often enriched in pegmatites. To better understand the enrichment of Li in such systems, it is necessary to understand the underlying transport mechanisms. We performed experiments to investigate diffusion rates and exchange mechanisms of Li between a Li-rich and a Li-poor melt at high temperature and pressure. Our results indicate that fluxing elements do not increase the diffusivity of Li compared to a flux-free melt.