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Melting phase equilibrium relations in the MgSiO3-SiO2 system under high pressures

  • Takuya Moriguti , Yusuke Yachi , Akira Yoneda and Eiji Ito
Published/Copyright: December 1, 2022
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American Mineralogist
From the journal American Mineralogist Volume 107 Issue 12

Abstract

Melting relations in the MgSiO3-SiO2 system have been investigated at 13.5 GPa using a Kawai-type multi-anvil apparatus. The system displays eutectic melting with the eutectic point located at SiO2/(SiO2+MgO) = 0.61 (in mol; which is denoted by XSi hereafter) and at 2350 ± 50 °C. Taking into account the eutectic compositions at lower pressures reported in previous studies, i.e., 0.556 at 1 GPa (Hudon et al. 2005) and 0.60 at 5 GPa (Dalton and Presnall 1997), the eutectic composition is slightly enriched in SiO2 with increasing pressure. The silica-rich eutectic composition is not consistent with the present peridotitic mantle composition (XSi = 0.43). Considering Si incorporation into iron alloys in a magma ocean, however, mass-balance calculations based on an E-chondrite model demonstrate that the silicate magma ocean could have XSi consistent with the present peridotitic mantle.

Keywords: Melting; high pressure; MgSiO3-SiO2 system; mantle; enstatite chondrite model; multi-anvil; pressure calibration; thermal expansion

Acknowledgments

We acknowledge S. Yamashita and M. Akaogi for their fruitful discussions and comments. We also acknowledge T. Yoshino, D. Yamazaki, N. Tsujino, and M. Kanzaki for their helpful comments and technical support in experiments. We are deeply grateful to M.R.M. Izawa for his constructive comments and for improving the text. Insightful comments by two reviewers, M. Walter and J. Li, were helpful in improving the manuscript, and we are thankful to M. Walter for greatly improving the text. We appreciate S. Tateno for his helpful comments to give us a catalyst for advancing this study. We thank L. Xie, F. Xu, and C. Oka for their technical support.

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Received: 2021-02-02
Accepted: 2021-12-21
Published Online: 2022-12-01
Published in Print: 2022-12-16

© 2022 Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8004
Keywords for this article
Melting; high pressure; MgSiO3-SiO2 system; mantle; enstatite chondrite model; multi-anvil; pressure calibration; thermal expansion

Articles in the same Issue

  1. Oxidation of arcs and mantle wedges: It’s not all about iron and water
  2. Paragenesis of Li minerals in the Nanyangshan rare-metal pegmatite, Northern China: Toward a generalized sequence of Li crystallization in Li-Cs-Ta-type granitic pegmatites
  3. The new mineral tomiolloite, Al12(Te4+O3)5[(SO3)0.5(SO4)0.5](OH)24: A unique microporous tellurite structure
  4. Authigenic anatase nanoparticles as a proxy for sedimentary environment and porewater pH
  5. Color effects of Cu nanoparticles in Cu-bearing plagioclase feldspars
  6. Expanding the speciation of terrestrial molybdenum: Discovery of polekhovskyite, MoNiP2, and insights into the sources of Mo-phosphides in the Dead Sea Transform area
  7. Sound speed and refractive index of amorphous CaSiO3 upon pressure cycling to 40 GPa
  8. Calorimetric study of skutterudite (CoAs2.92) and heazlewoodite (Ni3S2)
  9. Melting phase equilibrium relations in the MgSiO3-SiO2 system under high pressures
  10. Effects of hydrostaticity and Mn-substitution on dolomite stability at high pressure
  11. Crystallization of bastnäsite and burbankite from carbonatite melt in the system La(CO3)F-CaCO3-Na2CO3 at 100 MPa
  12. Crystal shapes, triglyphs, and twins in minerals: The case of pyrite
  13. Nanostructure reveals REE mineral crystallization mechanisms in granites from a heavy REE deposit, South China
  14. Paratobermorite, Ca4(Al0.5Si0.5)2Si4O16(OH)·2H2O·(Ca·3H2O), a new tobermorite-supergroup mineral with a novel topological type of the microporous crystal structure
  15. Morphological and chemical characterization of secondary carbonates in the Toki granite, central Japan, and the evolution of fluid chemistry
  16. Characteristics and formation of corundum within syenite in the Yushishan rare metal deposits in the northeastern Tibetan Plateau
  17. Hydrogen solubility in FeSi alloy phases at high pressures and temperatures
  18. First evidence of dmisteinbergite (CaAl2Si2O8 polymorph) in high-grade metamorphic rocks
  19. New Mineral Names
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