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In situ X-ray observation of 10 Å phase stability at high pressure

  • Sergey V. Rashchenko EMAIL logo , Seiji Kamada , Naohisa Hirao , Konstantin D. Litasov and Eiji Ohtani
Published/Copyright: October 29, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 11

Abstract

The 10 Å phase, Mg3Si4O10(OH)2·H2O, is a high-pressure hydrous phyllosilicate considered as an important link in the succession of hydrous phases transporting water into the deep mantle. In this study, in situ synchrotron X-ray diffraction combined with external heating diamond-anvil cell was used to determine limits of the 10 Å phase stability at pressures above 7 GPa. A reaction “10 Å phase + H2O→ hydroxide-perovskite (3.65 Å phase) + stishovite” at about 10 GPa was found to be a high-pressure boundary of the 10 Å phase stability field. A dehydration temperature of the 10 Å phase “10 Å phase → enstatite + stishovite + H2O” decreases with pressure from 690 °C at 7 GPa to 450 °C at 10 GPa; a nonvariant point where 10 Å phase, hydroxide-perovskite and enstatite coexist in the presence of stishovite and hydrous fluid was found near 10 GPa and 450 °C.

Keywords: 10 Å phase; 3.65 Å phase; hydroxide-perovskite; DHMS; deep water cycle

Acknowledgement

The research was supported by state assignment project no. 0330-2016-0004, Russian Ministry of Education and Science [grant no. 14.B25.31.0032], Russian Science Foundation [grant no. 14-13-00834], and Japan Society for the Promotion of Science [grants nos. 22000002 and 15H5748]. The research was also supported by Japan Society for the Promotion of Science and Russian Foundation for Basic Research under the Japan-Russia Research Collaboration program. The in situ synchrotron X-ray diffraction experiments were performed under SPring-8 research proposals nos. 2014B0104 and 2015B0104. We acknowledge F. Maeda, N. Suzuki, and R. Masudo for their kind assistance in preparation of this experiment.

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Received: 2016-3-12
Accepted: 2016-7-6
Published Online: 2016-10-29
Published in Print: 2016-11-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5764
Keywords for this article
10 Å phase; 3.65 Å phase; hydroxide-perovskite; DHMS; deep water cycle

Articles in the same Issue

  1. Highlights and Breakthroughs
  2. Melts, mush, and more: Evidence for the state of intermediate-to-silicic arc magmatic systems
  3. Investigating petrologic indicators of magmatic processes in volcanic rocks
  4. Nucleation rates of spherulites in natural rhyolitic lava
  5. Review
  6. Silicic magma reservoirs in the Earth’s crust
  7. Special Collection: New Advances in Subduction Zone Magma Genesis
  8. Petrogenesis of antecryst-bearing arc basalts from the Trans-Mexican Volcanic Belt: Insights into along-arc variations in magma-mush ponding depths, H2O contents, and surface heat flux
  9. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  10. Wayneburnhamite, Pb9Ca6(Si2O7)3(SiO4)3, an apatite polysome: The Mn-free analog of ganomalite from Crestmore, California
  11. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  12. U-Pb LA-ICP-MS dating of apatite in mafic rocks: Evidence for a major magmatic event at the Devonian-Carboniferous boundary in the Armorican Massif (France)
  13. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  14. Quantification of CO2 concentration in apatite
  15. Special Collection: Apatite: a Common Mineral, Uncommonly Versatile
  16. Phosphate minerals in the H group of ordinary chondrites, and fluid activity recorded by apatite heterogeneity in the Zag H3-6 regolith breccia
  17. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  18. In situ elemental and isotopic analysis of fluorapatite from the Taocun magnetite-apatite deposit, Eastern China: Constraints on fluid metasomatism
  19. Special Collection: Geology and Geobiology of Lassen Volcanic National Park
  20. Acido-thermotolerant fungi from Boiling Springs Lake, LVNP: Potential for lignocellulosic biofuels
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  22. Solid solution along the synthetic LiAISi2O6-LiFeSi2O6 (spodumene-ferri-spodumene) join: A general picture of solid solutions, bond lengths, lattice strains, steric effects, symmetries, and chemical compositions of Li clinopyroxenes
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