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An experimental study of the Fe oxidation states in garnet and clinopyroxene as a function of temperature in the system CaO–FeO–Fe2O3–MgO–Al2O3–SiO2: implications for garnet–clinopyroxene geothermometry

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Abstract

Samples with eclogitic composition in the system CaO–FeO–Fe2O3–MgO–Al2O3–SiO2 were produced from various kinds of starting materials held in graphite-lined Pt capsules at a pressure of 2.5–3.0 GPa and temperatures of 800–1,300 °C using a piston-cylinder or Belt apparatus. Garnets and clinopyroxenes were characterized by analytical transmission electron microscopy and electron probe micro-analysis (EPMA). Fe3+/ΣFe ratios determined by electron energy-loss spectroscopy (EELS) decrease in clinopyroxene from 22.2 ± 3.4 % at 800 °C to 13.3 ± 5.4 % at 1,300 °C, while in garnet, they vary between 10.8 ± 1.5 and 15.4 ± 4.7 %, respectively. Temperature estimates according to Krogh (Contrib Mineral Petrol 99:44–48, 1988) reproduce the experimental temperature to ±60 °C without systematic deviations if total iron is used in the calculation. If only the Fe2+ content is used, which was obtained by combining EPMA and EELS results, the experimental temperature is underestimated by 33 °C on average at 800–1,200 °C and overestimated by 77 °C on average at 1,300 °C. These systematic deviations can be explained by the temperature-dependent ratio of Fe2+/ΣFe in garnet divided by that in clinopyroxene. Since the difference between the calculated and experimental temperature is relatively small, a Fe2+-based recalibration of the thermometer appears not to be necessary for the investigated system in the range of pressure, temperature and composition covered by the experiments of this study.

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Acknowledgments

Funding by the Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged. We would like to thank H. Höfer for helping with the microprobe and M. M. Müller for solving problems in TEM sample preparation. V. Bulatov is thanked for kindly providing some of the synthetic fayalite used for the starting materials. We would like to thank the anonymous reviewer and Robert W. Luth for their constructive reviews.

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Authors and Affiliations

  1. Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, Schnittspahnstr. 9, 64287, Darmstadt, Germany

    Horst Purwin, Stefan Lauterbach & Hans-Joachim Kleebe

  2. Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, 60438, Frankfurt/Main, Germany

    Gerhard P. Brey & Alan B. Woodland

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  1. Horst Purwin
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  2. Stefan Lauterbach
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  3. Gerhard P. Brey
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  4. Alan B. Woodland
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  5. Hans-Joachim Kleebe
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Correspondence to Horst Purwin.

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Communicated by M. W. Schmidt.

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Purwin, H., Lauterbach, S., Brey, G.P. et al. An experimental study of the Fe oxidation states in garnet and clinopyroxene as a function of temperature in the system CaO–FeO–Fe2O3–MgO–Al2O3–SiO2: implications for garnet–clinopyroxene geothermometry. Contrib Mineral Petrol 165, 623–639 (2013). https://doi.org/10.1007/s00410-012-0827-4

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  • DOI: https://doi.org/10.1007/s00410-012-0827-4

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