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Behavior of trace elements in relation to Lu–Hf and Sm–Nd geochronometers during metamorphic dehydration–hydration in the HP domain of Vårdalsneset, Western Gneiss Region, Norway

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Abstract

The geochemical and isotopic characterization of an eclogite and the associated retrogressive amphibolite at Vårdalsneset, WGR, Norwegian Caledonide was undertaken to investigate the mobility of REE and Hf and the behavior of Lu–Hf and Sm–Nd geochronometers during metamorphic dehydration/rehydration. Eclogitic garnets display a distinct core–rim chemical zoning. Thermodynamic modeling indicates that both cores (13–22 kbar, 500–580°C) and rims (>16 kbar, 610–660°C) crystallized under eclogite-facies conditions. The core–rim zoning corresponds to the dehydration of the system. This petrographic disequilibrium is associated with Lu–Hf and Sm–Nd disequilibrium, which prevents dating of the eclogitic stages. At the rock scale, the incoming fluid responsible for eclogite–amphibolite retrogression brought in Sm and Nd, leached Lu, and had no influence on Hf. At the grain scale, mass balance shows that Sm and Nd were stored in clinozoisite since the first eclogitic stage, whereas Lu and Hf, which were more thoroughly redistributed among minerals during retrogression, enable the dating of the amphibolitic facies at 378 ± 17 Ma.

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Acknowledgments

Journal reviews by Peter Robinson and an anonymous reviewer helped to significantly improve this paper. The authors acknowledge Catherine Zimmermann for TIMS analyses, Delphine Yeghicheyan and Luc Marin for their help in chemical analysis. The authors are grateful to Carsten Münker and Eric Scherer for discussions about Hf chemistry, to Jonathan Patchett for making available an aliquot of the JMC 475Hf isotopic standard, to Janne Blichert-Toft for interesting discussion about Hf data and to Tim John for interesting discussion about petrology and mobility of trace elements. Béatrice Luais and Stéphanie Duchêne are grateful to Laurent Jolivet and Loic Labrousse for fieldwork in Norway in June 2000. Céline Martin acknowledges Bernhard Stöckert, Klaus Röller and Sandra Birtel (Ruhr Universität, Bochum) for the fieldtrip in Norway in August 2006. This work benefited from INSU-CNRS funding (IT, DYETI and 3F programs).

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  1. CRPG, Nancy-Université, CNRS, 15 rue Notre Dame des Pauvres, 54501, Vandoeuvre lès Nancy Cedex, France

    Céline Martin, Stéphanie Duchêne, Béatrice Luais, Etienne Deloule & Céline Fournier

  2. UMR 6249 Chrono-Environnement, CNRS, Université de Franche-Comté, 25030, Besançon, France

    Philippe Goncalves

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  1. Céline Martin
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Martin, C., Duchêne, S., Luais, B. et al. Behavior of trace elements in relation to Lu–Hf and Sm–Nd geochronometers during metamorphic dehydration–hydration in the HP domain of Vårdalsneset, Western Gneiss Region, Norway. Contrib Mineral Petrol 159, 437–458 (2010). https://doi.org/10.1007/s00410-009-0434-1

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