Startseite Phase transformation of hydrous ringwoodite to the lower-mantle phases and the formation of dense hydrous silica
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Phase transformation of hydrous ringwoodite to the lower-mantle phases and the formation of dense hydrous silica

  • Huawei Chen , Kurt Leinenweber , Vitali Prakapenka , Martin Kunz , Hans A. Bechtel , Zhenxian Liu und Sang-Heon Shim ORCID logo
Veröffentlicht/Copyright: 20. September 2020
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 105 Heft 9

Abstract

To understand the effects of H2O on the mineral phases forming under the pressure-temperature conditions of the lower mantle, we have conducted laser-heated diamond-anvil cell experiments on hydrous ringwoodite (Mg2SiO4 with 1.1 wt% H2O) at pressures between 29 and 59 GPa and temperatures between 1200 and 2400 K. Our results show that hydrous ringwoodite (hRw) converts to crystalline dense hydrous silica, stishovite (Stv) or CaCl2-type SiO2 (mStv), containing 1 wt% H2O together with Brd and MgO at the pressure-temperature conditions expected for shallow lower-mantle depths between approximately 660 to 1600 km. Considering the lack of sign for melting in our experiments, our preferred interpretation of the observation is that Brd partially breaks down to dense hydrous silica and periclase (Pc), forming the phase assembly Brd + Pc + Stv. The results may provide an explanation for the enigmatic coexistence of Stv and Fp inclusions in lower-mantle diamonds.

Keywords: Stishovite; ringwoodite; bridgmanite; periclase; water; mantle; Volatile Elements in Differentiated Planetary Interiors

† Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html

Acknowledgments and Funding

We thank two anonymous reviewers and the editor. This work was supported by NSF grants (EAR1321976 and EAR1401270) and NASA grant (80NSSC18K0353) to S.H.S. H.C. has been supported by the Keck foundation (PI: P. Buseck). The results reported herein benefit from collaborations and/ or information exchange within NASA’s Nexus for Exoplanet System Science (NExSS) research coordination network sponsored by NASA’s Science Mission Directorate. We acknowledge the use of facilities within the Eyring Materials Center at Arizona State University. The synchrotron experiments were conducted at GSECARS, Advanced Photon Source (APS), Advanced Light Source (ALS), and National Synchrotron Light Source (NSLS). GSECARS is supported by NSF-Earth Science (EAR-1128799) and DOE-GeoScience (DE-FG02-94ER14466). The Multi-Anvil Cell Assembly Project, DAC gas loading, and the U2A beamline at the NSLS are supported by COMPRES under NSF EAR 11-43050. APS, ALS, and NSLS are supported by DOE, under contracts DE-AC02-06CH11357, DE-AC02-05CH11231, and DE-SC0012704, respectively. The experimental data for this paper are available by contacting SHDShim@asu.edu or hchen156@asu.edu.

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Received: 2019-08-14
Accepted: 2020-03-13
Published Online: 2020-09-20
Published in Print: 2020-09-25

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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  2. How American Mineralogist and the Mineralogical Society of America influenced a career in mineralogy, petrology, and plate pushing, and thoughts on mineralogy’s future role
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https://doi.org/10.2138/am-2020-7261
Schlagwörter für diesen Artikel
Stishovite; ringwoodite; bridgmanite; periclase; water; mantle; Volatile Elements in Differentiated Planetary Interiors

Artikel in diesem Heft

  1. MSA Centennial Review Paper
  2. How American Mineralogist and the Mineralogical Society of America influenced a career in mineralogy, petrology, and plate pushing, and thoughts on mineralogy’s future role
  3. Petrographic and spectral study of hydrothermal mineralization in drill core from Hawaii: A potential analog to alteration in the martian subsurface
  4. Characterizing low-temperature aqueous alteration of Mars-analog basalts from Mauna Kea at multiple scales
  5. Archean to Paleoproterozoic seawater halogen ratios recorded by fluid inclusions in chert and hydrothermal quartz
  6. Metasomatism-controlled hydrogen distribution in the Spitsbergen upper mantle
  7. Phase transformation of hydrous ringwoodite to the lower-mantle phases and the formation of dense hydrous silica
  8. Density and sound velocity of liquid Fe-S alloys at Earth’s outer core P-T conditions
  9. Some geometrical properties of fission-track-surface intersections in apatite
  10. Thermal equation of state of post-aragonite CaCO3-Pmmn
  11. Structure of NaFeSiO4, NaFeSi2O6, and NaFeSi3O8 glasses and glass-ceramics
  12. Raman spectroscopic studies of O–H stretching vibration in Mn-rich apatites: A structural approach
  13. Characterization of modified mineral waste material adsorbent as affected by thermal treatment for optimizing its adsorption of lead and methyl orange
  14. Morin-type transition in 5C pyrrhotite
  15. The formation of marine red beds and iron cycling on the Mesoproterozoic North China Platform
  16. A multi-methodological study of kernite, a mineral commodity of boron
  17. Letter
  18. Si-rich Mg-sursassite Mg4Al5Si7O23(OH)5 with octahedrally coordinated Si: A new ultrahigh-pressure hydrous phase
  19. Inherited Eocene magmatic tourmaline captured by the Miocene Himalayan leucogranites
  20. Memorial of F. Donald Bloss 1920–2020
  21. Book Review
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