Abstract
We present new partition coefficients for the REE, HFSE, Sn, In, Ga, Ba, Pt and Rh between clinopyroxene, olivine and basaltic melt as a function of crystal chemistry and melt composition at temperatures of 1190–1300 °C and 1-bar pressure. Two components, namely \(\mathrm {Al_2O_3}\) and \(\mathrm {Na_2O}\), were chosen to be investigated since they are known to affect the structure of silicate melts and especially clinopyroxene crystal chemistry. The amount of \(^{[4]}\mathrm{Al}\) in clinopyroxene will result in an increase of \(D_i^\mathrm{{cpx/melt}}\) even after applying a correction factor to account for the effect of melt polymerization. Moreover, the positive correlation between \(^{[4]}\mathrm{Al}\) and \(D_i^\mathrm{{cpx/melt}}\) is not restricted to the REE, but also applies for Sn, Ga, In, and Ba. The addition of up to 2.6 wt% \(\mathrm {Na_2O}\) to the silicate melt universally increases the \(D_i^\mathrm{{cpx/melt}}\) without any concomitant change in crystal chemistry or a significant effect in melt polymerization. This compositional effect is likely due to the ability of Na to break REE–Al complexes in the melt. Our results emphasize the importance of considering all variables that affect the behavior of trace elements in magmatic systems before applying the lattice strain model and derive meaningful results for the changes in the parameters of the crystallographic sites.
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Acknowledgements
We are grateful to two anonymous reviewers for their comments, which greatly improved the manuscript, and to H. Keppler for his editorial handling. We thank N. Jung, T. Schulz, D. Lülsdorf and K. Brückel for their technical support at the University of Bonn. We are indebted to Chris Ballhaus for discussion, comments and suggestions. R.F. acknowledges financial support from the Deutsche Forschungsgemeinschaft (via DFG Grant FO 698/3). F.P.L. was supported by a PhD scholarship from DAAD/CNPq (Grant 248562/2013-4). This manuscript is contribution no. 39 of the LA-ICP-MS laboratory of the Steinmann Institute for Geosciences, University of Bonn.
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Communicated by Othmar Müntener.
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Michely, L.T., Leitzke, F.P., Speelmanns, I.M. et al. Competing effects of crystal chemistry and silicate melt composition on trace element behavior in magmatic systems: insights from crystal/silicate melt partitioning of the REE, HFSE, Sn, In, Ga, Ba, Pt and Rh. Contrib Mineral Petrol 172, 39 (2017). https://doi.org/10.1007/s00410-017-1353-1
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DOI: https://doi.org/10.1007/s00410-017-1353-1