Abstract
Zircon is widely used to date metamorphic processes, particularly due to slow cation diffusion under crustal conditions. Here, we present laser-ablation depth profiling data that demonstrate rapid U diffusion in partially altered, high-pressure zircon. The zircons are hosted in metagabbros that underwent eclogite-facies (~ 550 °C, ~ 2.6 GPa) recrystallization during subduction of the Monviso meta-ophiolite. One metagabbro contains only newly grown zircons (50.2 ± 1.1 Ma); two coarser-grained samples exhibit thin metamorphic rims on igneous cores. Most profiles in the coarse-grained samples record discrete PbC-rich and Pb*-, U-, Th-, and trace-element poor rims in the outermost ≤ 5 µm of each grain, but U shows apparent diffusion profiles that extend ~ 10–15 µm into zircon crystals and correlate with U–Pb date resetting. The data define three populations (cores, diffusively reset rims, and newly precipitated rims) that form two two-component mixtures, indicating that recrystallization was everywhere coupled with U addition. Data from fully equilibrated rims form a single age population (51.1 ± 0.4 Ma) within error of the newly grown zircon and compatible with ~ 1 My fluid–rock interaction timescales. We interpret the U profiles as evidence of inward U diffusion associated with fluid-induced resorption, and systematically exclude other mechanisms for their formation. However, calculated diffusivity estimates are > 20 orders of magnitude faster than predicted by experiments. The absence of zircon lattice damage, and the propagation of diffusion inward of a reaction front, indicates a link between fluid-saturated zircon alteration and fast U diffusion in zircon. Our results emphasize that–-even at low temperature–-zircon U–Pb systematics may be affected by parent and/or daughter diffusion over length scales large enough to affect laser-ablation or ion microprobe spot analyses.
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Acknowledgements
We thank P. Starr for sharing field notes and sample context, H. Marschall for access to the SelFrag, J. Cottle for error propagation advice, J. Singer for CL expertise, and M. Wetherington for Raman assistance. We also acknowledge the ExTerra Field Institute and Research Endeavor (E-FIRE) program participants, including field assistance from P. Agard, M. Locatelli, and S. Angiboust. We are grateful to D. Rubatto, E. B. Watson, and two anonymous reviewers for comments that significantly improved the manuscript, and to D. Rubatto for editorial handling. This work was funded by National Science Foundation Grant OISE-1545903.
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Garber, J.M., Smye, A.J., Feineman, M.D. et al. Decoupling of zircon U–Pb and trace-element systematics driven by U diffusion in eclogite-facies zircon (Monviso meta-ophiolite, W. Alps). Contrib Mineral Petrol 175, 55 (2020). https://doi.org/10.1007/s00410-020-01692-2
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DOI: https://doi.org/10.1007/s00410-020-01692-2