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Phase transition of wadsleyite-ringwoodite in the Mg2SiO4-Fe2SiO4 system

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Veröffentlicht/Copyright: 24. März 2019
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 104 Heft 4

Abstract

The Fe-bearing wadsleyite-ringwoodite phase transition loop under dry conditions in a temperature range of 1473 and 1873 K was determined by in situ X-ray diffraction experiments at the synchrotron facility SPring-8. Pressure at high temperature was precisely determined within a 0.23 GPa error using in situ X-ray diffraction of MgO as a pressure standard. Under dry conditions, assuming an equilibrium chemical composition of wadsleyite and ringwoodite coexisting with garnet in a pyrolite model and an adiabatic temperature gradient with a potential temperature of 1550–1650 K, the phase transition depth and effective width of the seismic discontinuity were found to be 500–514 and 20–22 km, respectively. This effective width, which is three times greater than that of the olivine-wadsleyite phase boundary, can reflect a seismic wave of approximately 0.25 Hz. The wider transition loop between wadsleyite and ringwoodite could create a broad seismic discontinuity. Considering wet and oxidized conditions, the depth of the wadsleyite-ringwoodite phase boundary could be greater than 520 km assuming the small temperature dependency on water and oxygen fugacity effects. Variation in the depth of seismic anomaly may be attributed to water content or oxygen fugacity of the transition zone.

Keywords: Mantle; wadsleyite; ringwoodite; phase boundary loop; in-situ experiments

  1. Funding: This work was supported by the Grant-in-Aid for JSPS Fellows (15J09669) and Grant-in-Aid for Scientific Research (B) (18H01314) to N.T. The in situ X-ray diffraction experiments implemented to precisely determine pressure were conducted on the BL04B1 at SPring-8 under the approval of the JASRI (Proposal Nos. 2012B1437, 2013A1475, 2013B1434, 2014A1431, 2014B1400, 2015A1600, 2015B1504, 2017A1525, 2017B1329, and 2018A1457).

Acknowledgments

We thank Toshihiro Suzuki for many helpful comments. We are grateful to Anwar Mohiuddin for reading the manuscript and providing constructive comments. We appreciate HACTO group member for their help in obtaining diffraction data.

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Received: 2018-09-24
Accepted: 2019-01-15
Published Online: 2019-03-24
Published in Print: 2019-04-24

© 2019 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Introduction
  2. Deep carbon cycle through five reactions
  3. Earth in five reactions: Grappling with meaning and value in science
  4. In-situ iron isotope analyses reveal igneous and magmatic-hydrothermal growth of magnetite at the Los Colorados Kiruna-type iron oxide-apatite deposit, Chile
  5. Carbon and nitrogen isotopes and mineral inclusions in diamonds from chromitites of the Mirdita ophiolite (Albania) demonstrate recycling of oceanic crust into the mantle
  6. Geochronology and trace element mobility in rutile from a Carboniferous syenite pegmatite and the role of halogens
  7. The incorporation of chlorine into calcium amphibole
  8. Crystal size distribution of amphibole grown from hydrous basaltic melt at 0.6–2.6 GPa and 860–970 °C
  9. Role of micropores, mass transfer, and reaction rate in the hydrothermal alteration process of plagioclase in a granitic pluton
  10. Lead diffusion in CaTiO3: A combined study using Rutherford backscattering and TOF-SIMS for depth profiling to reveal the role of lattice strain in diffusion processes
  11. On growth and form of etched fission tracks in apatite: A kinetic approach
  12. High-pressure behavior of liebenbergite: The most incompressible olivine-structured silicate
  13. Phase transition of wadsleyite-ringwoodite in the Mg2SiO4-Fe2SiO4 system
  14. Cation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): X-ray diffraction and photoelectron spectroscopy studies and mechanisms of Nb enrichment
  15. Meyrowitzite, Ca(UO2)(CO3)2⋅5H2O, a new mineral with a novel uranyl-carbonate sheet
  16. Letter
  17. Discovery of the first natural hydride
  18. Synthesis of pigeonites for spectroscopic studies
  19. Presentation of the 2018 Roebling Medal of the Mineralogical Society of America to E. Bruce Watson
  20. Acceptance of the 2018 Roebling Medal of the Mineralogical Society of America
  21. Presentation of the Dana Medal of the Mineralogical Society of America for 2018 to Jörg Hermann
  22. Acceptance of the Dana Medal of the Mineralogical Society of America for 2018
  23. New Mineral Names
  24. Book Review
https://doi.org/10.2138/am-2019-6823
Schlagwörter für diesen Artikel
Mantle; wadsleyite; ringwoodite; phase boundary loop; in-situ experiments

Artikel in diesem Heft

  1. Introduction
  2. Deep carbon cycle through five reactions
  3. Earth in five reactions: Grappling with meaning and value in science
  4. In-situ iron isotope analyses reveal igneous and magmatic-hydrothermal growth of magnetite at the Los Colorados Kiruna-type iron oxide-apatite deposit, Chile
  5. Carbon and nitrogen isotopes and mineral inclusions in diamonds from chromitites of the Mirdita ophiolite (Albania) demonstrate recycling of oceanic crust into the mantle
  6. Geochronology and trace element mobility in rutile from a Carboniferous syenite pegmatite and the role of halogens
  7. The incorporation of chlorine into calcium amphibole
  8. Crystal size distribution of amphibole grown from hydrous basaltic melt at 0.6–2.6 GPa and 860–970 °C
  9. Role of micropores, mass transfer, and reaction rate in the hydrothermal alteration process of plagioclase in a granitic pluton
  10. Lead diffusion in CaTiO3: A combined study using Rutherford backscattering and TOF-SIMS for depth profiling to reveal the role of lattice strain in diffusion processes
  11. On growth and form of etched fission tracks in apatite: A kinetic approach
  12. High-pressure behavior of liebenbergite: The most incompressible olivine-structured silicate
  13. Phase transition of wadsleyite-ringwoodite in the Mg2SiO4-Fe2SiO4 system
  14. Cation ordering, valence states, and symmetry breaking in the crystal-chemically complex mineral chevkinite-(Ce): X-ray diffraction and photoelectron spectroscopy studies and mechanisms of Nb enrichment
  15. Meyrowitzite, Ca(UO2)(CO3)2⋅5H2O, a new mineral with a novel uranyl-carbonate sheet
  16. Letter
  17. Discovery of the first natural hydride
  18. Synthesis of pigeonites for spectroscopic studies
  19. Presentation of the 2018 Roebling Medal of the Mineralogical Society of America to E. Bruce Watson
  20. Acceptance of the 2018 Roebling Medal of the Mineralogical Society of America
  21. Presentation of the Dana Medal of the Mineralogical Society of America for 2018 to Jörg Hermann
  22. Acceptance of the Dana Medal of the Mineralogical Society of America for 2018
  23. New Mineral Names
  24. Book Review
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