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Crystal chemical controls on rare earth element partitioning between epidote-group minerals and melts: an experimental and theoretical study

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Abstract

We have experimentally determined the partitioning of REE (rare earth elements) between zoisite and hydrous silicate melt at 1,100 °C and 3 GPa. All REE behave moderately compatible in zoisite with respect to the melt and all \( D_{REE}^{zo/melt} \) show a smooth parabolic dependence on ionic radius. The partitioning parabola peaks at Nd \( \left( {D_{Nd}^{zo/melt} = 4.9} \right) \), and the compatibility slightly decreases towards La \(\left( {D_{La}^{zo/melt} = 3.9} \right)\) and decreases by half an order of magnitude towards Yb \(\left( {D_{Yb}^{zo/melt} = 1.1} \right)\). Application of the elastic strain model of Blundy and Wood (1994) to the available zoisite and allanite REE mineral/melt partitioning data and comparison with partitioning pattern calculated from a combination of structural and physical data (taken from the literature) with the elastic strain model suggest that in zoisite REE prefer the A1-site and that only La and Ce are incorporated into the A2-site in significant amounts. In contrast, in allanite, all REE are preferentially incorporated into the large and highly co-ordinated A2 site. As a result, zoisite fractionates the MREE effectively from the HREE and moderately from the LREE, while allanite fractionates the LREE very effectively from the MREE and HREE. Consequently, the presence of either zoisite or allanite during slab melting will lead to quite different REE pattern in the produced melt.

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Acknowledgements

D.F. acknowledges generous funding from the European Union as a Marie-Curie Individual Fellow (contract no. ERBFMBICT 983374 to DF) and Deutsche Forschungsgemeinschaft (DFG grant Fr 557/17-1). D.F. would especially like to thank Martina Frei for the donation of a generous MF special research grant. The high-pressure experimental work was supported by Deutsche Forschungsgemeinschaft (DFG grant Wi 1934/1-1 to AW). D.F. likes to thank Claude Dalpé for assistance during LA-ICP-MS analysis. Antje Gebel provided the trace element analysis of starting materials, for which the authors are particularly thankful. The final shape of this manuscript significantly benefited from comments by Gerhard Franz and Jon Blundy as well as the thorough and constructive reviews of Stephan Klemme, Stephen Foley and an anonymous reviewer, which the authors greatly appreciate.

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  1. Dirk Frei

    Present address: Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 , København K, Denmark

  2. Cliff S. J. Shaw

    Present address: University of New Brunswick, Department of Geology, Fredericton, New Brunswick , E3B 5A3, Canada

Authors and Affiliations

  1. Technische Universität Berlin , Fachgebiet Petrologie, Sekretariat BH1, Ernst-Reuter-Platz 1, 10587, Berlin, Germany

    Dirk Frei

  2. GeoForschungsZentrum Potsdam, Sektion 4.1, Experimentelle Geochemie und Mineralphysik, Telegrafenberg, 14473 , Potsdam, Germany

    Axel Liebscher

  3. Institut für Mineralogie, Universität Hannover, Callinstr. 3, 30167 , Hannover, Germany

    Antje Wittenberg

  4. Bayerisches Geoinstitut, Universität Bayreuth, 95440, Bayreuth, Germany

    Cliff S. J. Shaw

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  1. Dirk Frei
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Correspondence to Dirk Frei.

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Frei, D., Liebscher, A., Wittenberg, A. et al. Crystal chemical controls on rare earth element partitioning between epidote-group minerals and melts: an experimental and theoretical study. Contrib Mineral Petrol 146, 192–204 (2003). https://doi.org/10.1007/s00410-003-0493-7

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