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Alkali in phlogopite and amphibole and their effects on phase relations in metasomatized peridotites: a high-pressure study

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Abstract

Subsolidus phase relations for a K-doped lherzolite are investigated in the model system K2O–Na2O–CaO–FeO–MgO–Al2O3–SiO2–H2O at 1.5–6.0 GPa and 680–1,000°C. Phlogopite is ubiquitous and coexists with Ca-amphibole up to 3.2 GPa and 900°C. High-pressure phlogopites show a peculiar mineral chemistry dependent on pressure: e.g., at 5.5 GPa and 680°C, excess of Si (up to 3.4 apfu) coupled with deficiency in Al (as low as 0.58 apfu) and K + Na (as low as 0.97 apfu), suggest a significant amount of a talc/10 Å phase component ([v]XIISi1K−1Al IV−1 , where [v]XII is interlayer vacancy). Mixed layering or solid solution relations between high-pressure phlogopites and the 10 Å phase, Mg3Si4O10(OH)2 nH2O, are envisaged. Phlogopite modal abundance, derived by weighted least squares, is maximum at high-pressure and relative low-temperature conditions and therefore along the slab–mantle interface (10.3 ± 0.7 wt.%, at 4.8 GPa, 680°C). In phlogopite-bearing systems, Ca-amphibole breaks down between 2.5 and 3.0 GPa, and 1,000°C, through the water conservative reaction 5(pa + 0.2 KNa−1) + 17en + 15phl = (10di + 4jd) + 5py + 12fo + 20(phl + 0.2 talc), governed by bulk composition and pressure-dependent variations of K/OH in K-bearing phases and as a result, it does not necessarily imply a release of fluid.

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Acknowledgments

We are indebted to J. Konzett and to an anonymous referee for their constructive reviews. Discussions with J. Hermann and C. Lithgow-Bertelloni allowed us to improve earlier versions of the manuscript. We wish to thank Andrea Risplendente for assistance at the microprobe and Giacomo Aletti for assistance in Monte Carlo simulations. The experimental and analytical work in Milan was partly funded by MIUR-PRIN 2007NCN7EZ_002 and EU MRTN-CT-2006-035957-c2c.

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  1. Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, 20133, Milan, Italy

    P. Fumagalli & S. Poli

  2. Dipartimento di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano Bicocca, Piazza della Scienza 4, 20126, Milan, Italy

    S. Zanchetta

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  1. P. Fumagalli
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Fumagalli, P., Zanchetta, S. & Poli, S. Alkali in phlogopite and amphibole and their effects on phase relations in metasomatized peridotites: a high-pressure study. Contrib Mineral Petrol 158, 723–737 (2009). https://doi.org/10.1007/s00410-009-0407-4

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