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Experimental and thermodynamic investigations on the stability of Mg14Si5O24 anhydrous phase B with relevance to Mg2SiO4 forsterite, wadsleyite, and ringwoodite

  • Hiroshi Kojitani EMAIL logo , Saki Terata , Maki Ohsawa , Daisuke Mori , Yoshiyuki Inaguma and Masaki Akaogi
Published/Copyright: October 2, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 10

Abstract

High-pressure high-temperature phase relation experiments in Mg14Si5O24 were performed using a 6-8 multi-anvil high-pressure apparatus in the pressure range of 12–22 GPa and temperature range of 1673–2173 K. We first found that Mg14Si5O24 anhydrous phase B (Anh-B) dissociates to Mg2SiO4 wadsleysite (Wd) and MgO periclase (Per) at about 18 GPa and 1873 K. From the results of the high-pressure experiments, the phase boundaries of 5 Mg2SiO4 forsterite (Fo) + 4 Per = Anh-B and Anh-B = 5 Wd + 4 Per were determined. In addition, the isobaric heat capacity (CP) of Anh-B was measured by differential scanning calorimetry in the temperature range of 300–770 K and the thermal relaxation method using a Physical Property Measurement System (PPMS) in the range of 2–303 K. From the measured low-temperature CP, the standard entropy (S298.15o) of Anh-B was determined to be 544.4(2) J/(mol⋅K). We also performed high-temperature X-ray diffraction measurements in the range 303–773 K to determine the thermal expansivity (α) of Anh-B. The obtained CP and α were theoretically extrapolated to higher temperature region using a lattice vibrational model calculation partly based on Raman spectroscopic data. Thermodynamic calculations by adopting the thermochemical and thermoelastic data for Anh-B obtained in this study and the estimated formation enthalpy for Anh-B of −13 208 kJ/mol gave phase equilibrium boundaries for 5 Fo + 4 Per = Anh-B and Anh-B = 5 Wd + 4 Per that were consistent with those determined by the present high-pressure high-temperature experiments. The results clarified that, in the Mg14Si5O24 system, Anh-B is stable between 12 and 18 GPa at the expected temperatures of the Earth’s mantle.

Keywords: Anhydrous phase B; phase boundary; heat capacity; entropy; thermal expansivity; Raman spectrum; wadsleyite; ringwoodite

Acknowledgments

We thank P.D. Asimow for helpful review comments. This work was supported in part by the JSPS grants (no. 15K05347 to H.K. and no. 25287145 and no. 17H02986 to M.A.) and by the MEXT-supported program for the Strategic Research Foundation at Private Universities.

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Received: 2017-2-24
Accepted: 2017-5-27
Published Online: 2017-10-2
Published in Print: 2017-10-26

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-6115
Keywords for this article
Anhydrous phase B; phase boundary; heat capacity; entropy; thermal expansivity; Raman spectrum; wadsleyite; ringwoodite

Articles in the same Issue

  1. Highlights and Breakthroughs
  2. Making a fine-scale ruler for oxide inclusions
  3. Special Collection: Biomaterials—Mineralogy Meets Medicine
  4. Substitution of sulfate in apatite
  5. Actinides in Geology, Energy, and the Environment
  6. Thermodynamic characterization of synthetic autunite
  7. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  8. The crystal structure of turneaureite, Ca5(AsO4)3Cl, the arsenate analog of chlorapatite, and its relationships with the arsenate apatites johnbaumite and svabite
  9. Special Collection: From Magmas to Ore Deposits
  10. Cu-Mo partitioning between felsic melts and saline-aqueous fluids as a function of XNaCleq, fO2, and fS2
  11. Special Collection: Dynamics of Magmatic Processes
  12. Continuous mush disaggregation during the long-lasting Laki fissure eruption, Iceland
  14. A new hydrothermal moissanite cell apparatus for optical in-situ observations at high pressure and high temperature, with applications to bubble nucleation in silicate melts
  16. Experimental and thermodynamic investigations on the stability of Mg14Si5O24 anhydrous phase B with relevance to Mg2SiO4 forsterite, wadsleyite, and ringwoodite
  18. Model for the origin, ascent, and eruption of lunar picritic magmas
  20. Phase relations of Fe-Mg spinels including new high-pressure post-spinel phases and implications for natural samples
  22. A Raman calibration for the quantification of SO42− groups dissolved in silicate glasses: Application to natural melt inclusions
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  30. Spin state and electronic environment of iron in basaltic glass in the lower mantle
  32. A shallow origin of so-called ultrahigh-pressure chromitites, based on single-crystal X-ray structure analysis of the high-pressure Mg2Cr2O5 phase, with modified ludwigite-type structure
  34. Biologically mediated crystallization of buddingtonite in the Paleoproterozoic: Organic-igneous interactions from the Volyn pegmatite, Ukraine
  36. Mengxianminite (Ca2Sn2Mg3Al8[(BO3)(BeO4)O6]2) a new borate mineral from Xianghualing skarn, Hunan Province, China, with a highly unusual chemical combination (B + Be + Sn)
  37. Letter: Special Collection: Nanominerals and Mineral Nanoparticles
  38. Previously unknown mineral-nanomineral relationships with important environmental consequences: The case of chromium release from dissolving silicate minerals
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