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Trace element thermometry of garnet-clinopyroxene pairs

  • Jonathan R. Pickles EMAIL logo , Jonathan D. Blundy and Richard A. Brooker
Published/Copyright: June 3, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 6

Abstract

We present major and trace element data on coexisting garnet and clinopyroxene from experiments carried out between 1.3 and 10 GPa and 970 and 1400 °C. We demonstrate that the lattice strain model, which was developed for applications to mineral-melt partitioning, can be adapted to garnet-clinopyroxene partitioning. Using new and published experimental data we develop a geothermometer for coexisting garnet and clinopyroxene using the concentration of rare earth elements (REE). The thermometer, which is based on an extension of the lattice strain model, exploits the tendency of minerals at elevated temperatures to be less discriminating against cations that are too large or too small for lattice sites. The extent of discrimination against misfit cations is also related to the apparent elasticity of the lattice site on which substitution occurs, in this case the greater stiffness of the dodecahedral X-site in garnet compared with the eightfold M2-site in clinopyroxene. We demonstrate that the ratio of REE in clinopyroxene to that in coexisting garnet is particularly sensitive to temperature. We present a method whereby knowledge of the major and REE chemistry of garnet and clinopyroxene can be used to solve for the equilibrium temperature. The method is applicable to any scenario in which the two minerals are in equilibrium, both above and below the solidus, and where the mole fraction of grossular in garnet is less than 0.4. Our method, which can be widely applied to both peridotitic and eclogitic paragenesis with particular potential for diamond exploration studies, has the advantage over commonly used Fe-Mg exchange thermometers in having a higher closure temperature because of slow interdiffusion of REE. The uncertainty in the calculated temperatures, based on the experimental data set, is less than ±80 °C.

Key words: Lattice strain model; geothermometer; garnet; clinopyroxene; eclogite; experimental petrology; REE

Acknowledgments

J.P. is grateful to Rio Tinto for a Ph.D. studentship at the University of Bristol, BGI and Dave Dobson for access to their multi-anvil apparatus and Richard Hinton for assistance with the ion-microprobe analyses. J.B. acknowledges funding from ERC Advanced Grant CRITMAG and a Royal Society Wolfson Research Merit Award. This work has benefitted from discussion with Chris Smith, Russell Sweeney, John Schumacher, Susanne Skora, and Wim van Westrenen. We thank Yan Liang and an anonymous reviewer for thoughtful reviews of our manuscript.

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Received: 2015-5-11
Accepted: 2016-2-5
Published Online: 2016-6-3
Published in Print: 2016-6-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5427
Keywords for this article
Lattice strain model; geothermometer; garnet; clinopyroxene; eclogite; experimental petrology; REE

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  1. Invited Centennial Article
  2. On the nature and significance of rarity in mineralogy
  3. Special collection: mechanisms, rates, and timescales of geochemical transport processes in the crust and mantle
  4. Zircon saturation and Zr diffusion in rhyolitic melts, and zircon growth geospeedometer
  5. Review
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  7. Special collection: advances in ultrahigh-pressure metamorphism
  8. Discovery of in situ super-reducing, ultrahigh-pressure phases in the Luobusa ophiolitic chromitites, Tibet: new insights into the deep upper mantle and mantle transition zone
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  11. Special collection: from magmas to ore deposits
  12. A story of olivine from the McIvor Hill complex (Tasmania, Australia): Clues to the origin of the Avebury metasomatic Ni sulfide deposit
  13. Special collection: perspectives on origins and evolution of crustal magmas
  14. The origin of extensive Neoarchean high-silica batholiths and the nature of intrusive complements to silicic ignimbrites: Insights from the Wyoming batholith, U.S.A.
  15. Special collection: perspectives on origins and evolution of crustal magmas
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  18. Compositional effects on the solubility of minor and trace elements in oxide spinel minerals: insights from crystal-crystal partition coefficients in chromite exsolution
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