Abstract
Plagioclase-melt partition coefficients (D) for 34 trace elements at natural concentration levels were determined experimentally in a natural MORB composition at atmospheric pressure using thin Pt-wire loops. Experiments were carried out at three temperatures (1,220, 1,200, and 1,180°C), and at three different oxygen fugacities (fO2 = IW, QFM, air) in order to assess the effect of fO2 on the partitioning of elements with multiple valence (Fe, Eu, Cr). Run products were analyzed by laser-ablation ICP-MS. Most trace element Ds increase slightly as temperature decreases, except for D Zr, D Fe, D Eu and D Cr that vary systematically with fO2. Applying the Lattice Strain Model to our data suggests the presence of Fe2+ entirely in the octahedral site at highly to moderate reducing conditions, while Fe3+ was assigned wholly to the tetrahedral site of the plagioclase structure. Furthermore, we provide a new quantitative framework for understanding the partitioning behaviour of Eu, which occurs as both 2+ and 3+ cations, depending on fO2and confirm the greater compatibility of Eu2+, which has an ionic radius similar to Sr, relative to Eu3+ in plagioclase and the higher Eu2+/ Eu3+ under reducing conditions. For petrogenetic basaltic processes, a combined fractionation of Eu2+–Sr and Fe–Mg by plagioclase has considerable potential as an oxybarometer for natural magmatic rocks.
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Acknowledgments
M.A.-T. is indebted to the Swiss National Science Foundation for research grants and kindly thanks J. Sinton for providing the samples from the R/V Atlantis cruise 3–31. T. We thank T. Ntaflos from the University of Vienna for helping with the EMP analysis. JDB acknowledges a Senior Research Fellowship from the NERC. This paper is dedicated to the memory of Prof. V. Trommsdorff.
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Communicated by T. L. Grove.
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Aigner-Torres, M., Blundy, J., Ulmer, P. et al. Laser Ablation ICPMS study of trace element partitioning between plagioclase and basaltic melts: an experimental approach. Contrib Mineral Petrol 153, 647–667 (2007). https://doi.org/10.1007/s00410-006-0168-2
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DOI: https://doi.org/10.1007/s00410-006-0168-2