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X-ray single-crystal and Raman study of (Na0.86Mg0.14)(Mg0.57Ti0.43)Si2O6, a new pyroxene synthesized at 7 GPa and 1700 °C

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Abstract

A new pyroxene with formula (Na0.86Mg0.14)(Mg0.57Ti0.43)Si2O6, synthesized in a high-pressure toroidal ‘anvil-with-hole’ apparatus at P = 7 GPa and T = 1700 °C, was characterized by X-ray single-crystal diffraction and Raman spectroscopy. The compound was found to be monoclinic (R1 = 2.56 %), space group C2/c, with lattice parameters a = 9.687(2), b = 8.814(1), c = 5.290(1) Å, β = 107.853(2)°, V = 430.08(1) Å3. The coexistence of Mg and Ti4+ at the M1 site does not induce strong modifications either to the M1 site or to the adjacent M2 site. The Raman spectrum of synthetic Na–Ti-pyroxene was obtained for the first time and compared with that of Mg2Si2O6 (with very low concentrations of Na and Ti). The structural characterization of the Na–Ti–Mg-pyroxene is important, because the study of its thermodynamic constants provides new constraints on thermobarometry of the upper mantle assemblages.

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Acknowledgments

We are grateful to S. Khasanov for help in XRD studies. Analyses of pyroxene were obtained at the Laboratory of Analytical Techniques of High Spatial Resolution, Department of Petrology, Moscow State University. The constructive reviews of Fabrizio Nestola and an anonymous referee were very helpful for improving the quality of the manuscript. This study was partly supported by the Russian Foundation for Basic Research (Project No. 16-05-00419) and Foundation of the President of the Russian Federation (Grant No MK-8033.2016.5).

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Authors and Affiliations

  1. Department of Petrology, Geological Faculty, Moscow State University, Moscow, Russia, 119991

    Ekaterina A. Sirotkina, Andrey V. Bobrov & Dmitry Yu. Pushcharovsky

  2. Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, Moscow, Russia, 119991

    Ekaterina A. Sirotkina & Andrey V. Bobrov

  3. Shubnikov Institute of Crystallography of Russian Academy of Sciences, Moscow, Russia, 117333

    Ekaterina A. Sirotkina

  4. Institute of Experimental Mineralogy of Russian Academy of Sciences, Chernogolovka, Russia, 142432

    Anna V. Spivak

  5. Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121, Florence, Italy

    Luca Bindi

  6. CNR - Istituto di Geoscienze e Georisorse, sezione di Firenze, Via La Pira 4, 50121, Florence, Italy

    Luca Bindi

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  1. Ekaterina A. Sirotkina
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Correspondence to Ekaterina A. Sirotkina.

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Sirotkina, E.A., Bobrov, A.V., Spivak, A.V. et al. X-ray single-crystal and Raman study of (Na0.86Mg0.14)(Mg0.57Ti0.43)Si2O6, a new pyroxene synthesized at 7 GPa and 1700 °C. Phys Chem Minerals 43, 731–738 (2016). https://doi.org/10.1007/s00269-016-0829-2

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