Trace element partitioning between mica- and amphibole-bearing garnet lherzolite and hydrous basanitic melt: 1. Experimental results and the investigation of controls on partitioning behaviour (original) (raw)

Abstract

Thirty five minor and trace elements (Li, Be, B, Sc, Cu, Zn, Ga, Ge, As, Rb, Nb, Mo, Ag, Cd, In, Sn, Sb, Cs, Ba, La, Ce, Nd, Sm, Tb, Ho, Tm, Lu, Hf, Ta, W, Tl, Pb, Bi, Th and U) in experimentally produced near-liquidus phases, from a primitive nelpheline basanite from Bow Hill in Tasmania (Australia), were analysed by LAM ICP-MS. A number of halogens (F, Cl and I) were also analysed by electron microprobe. The analyses were used to determine mineral/melt partition coefficients for mica, amphibole, garnet, clinopyroxene, orthopyroxene and olivine for conditions close to multiple saturation of the basanite liquidus with garnet lherzolite (approximately 2.6 GPa and 1,200°C with 7.5 wt% of added H2O). A broader range of conditions was also investigated from 1.0 GPa and 1,025°C to 3.5 GPa and 1,190°C with 5–10 wt% of added H2O. The scope and comprehensiveness of the data allow them to be used for two purposes, these include the following: an investigation of some of the controlling influences on partition coefficients; and the compilation of a set partition coefficients that are directly relevant to the formation of the Bow Hill basanite magma by partial melting of mantle peridotite. Considering clinopyroxene, the mineral phase for which the most data were obtained, systematic correlations were found between pressure and temperature, mineral composition, cation radius and valence, and Δ_G_ coulb (the coulombic potential energy produced by substituting a cation of mismatched valence into a crystallographic site). Δ_G_ coulb is distinctly different for different crystallographic sites, including the M2 and M1 sites in clinopyroxene. These differences can be modelled as a function of variations in optimum valence (expressed as 1 sigma standard deviations) within individual M1 and M2 site populations.

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Acknowledgements

The research for this study was undertaken with the help of on ARC Small Grant and a Macquarie University Research Grant to Trevor Green. We thank Dr Norm Pearson, Suzie Elhou and Carol Lawson for their assistance with electron microprobe and LAM ICP-Ms analyses. Both Jon Blundy and Greg Yaxley are thanked for their reviews of this paper. The graphite capsules and associated furnace components used in this study were manufactured by Rob Roy in the engineering workshop at Macquarie University. This is publication number 429 in the Australian Research Council National Key Centre for the Geochemical Evolution and Metallogeny of Continents (GEMOC).

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1. ARC National Key Centre for the Geochemical Evolution and Metallogeny of Continents, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW, 2109, Australia
   John Adam & Trevor Green
2. 408 Princes Highway, Blakehurst, NSW, 2221, Australia
   John Adam

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1. John Adam
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2. Trevor Green
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Correspondence toJohn Adam.

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Communicated by B. Collins

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Adam, J., Green, T. Trace element partitioning between mica- and amphibole-bearing garnet lherzolite and hydrous basanitic melt: 1. Experimental results and the investigation of controls on partitioning behaviour.Contrib Mineral Petrol 152, 1–17 (2006). https://doi.org/10.1007/s00410-006-0085-4

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• Received: 15 June 2005
• Accepted: 08 March 2006
• Published: 13 May 2006
• Issue Date: July 2006
• DOI: https://doi.org/10.1007/s00410-006-0085-4

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