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High-pressure phase transitions of clinoenstatite

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Veröffentlicht/Copyright: 27. Mai 2019
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 104 Heft 6

Abstract

Clinoenstatite (Mg2Si2O6) undergoes a well-known phase transition from a low-pressure form (LPCEN, space group P21/c) to a high-pressure form (HPCEN, space group C2/c) at ~6 GPa. High-pressure structure refinements of HPCEN were carried out based on single-crystal X‑ray diffraction experiments between 9.5 and 35.5 GPa to determine its P-V equation of state and structural evolution over an expanded pressure range relevant to pyroxene metastability. The best-fit isothermal equation of state to our data combined with the five data points between 5.34 and 7.93 GPa from Angel and Hugh-Jones (1994) yields a second-order Birch-Murnaghan equation with KT0 = 121(2) GPa and V0 = 403.9(5) Å3 (with KʹT0 = 4 implied). Further reduction of misfit upon fitting a third-order Birch-Murnaghan equation is not significant at the 90% confidence level. At ~45 GPa, a transition from HPCEN to a P21/c-structured polymorph (HPCEN2) was observed, which is isostructural to the P21/c phase recently observed in diopside (CaMgSi2O6) at 50 GPa (Plonka et al. 2012) and in clinoferrosilite (Fe2Si2O6) at 30–36 GPa (Pakhomova et al. 2017). Observation of HPCEN2 in Mg2Si2O6 completes the third apex of the pyroxene quadrilateral wherein HPCEN2 is found, facilitating a broader view of clinopyroxene crystal chemistry at conditions relevant to metastability in the Earth’s mantle along cold subduction geotherms.

Keywords: MgSiO3; clinoenstatite; enstatite; pyroxene; single-crystal X‑ray diffraction

  1. Funding This research was supported through grants from U.S. National Science Foundation EAR-1452344 and EAR-1853521 to S.D.J. and EAR-1722969 to P.D. Support was also provided by the Capital/DOE Alliance Center (CDAC). Development of the ATREX software used for data analysis was supported by NSF grant EAR1440005. Portions of this work were performed at HPCAT (Sector 16) of the Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA under Award No. DE-NA0001974, with partial instrumentation funding by NSF. The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. We thank Joshua Townsend for discussions and Sergey Tkachev for gas-loading diamond-anvil cells in the GSECARS gas-loading system, which is supported by COMPRES, the Consortium for Materials Properties Research in Earth Sciences under NSF Cooperative Agreement EAR 1606856.

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Received: 2018-07-19
Accepted: 2019-01-30
Published Online: 2019-05-27
Published in Print: 2019-06-26

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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  18. Book Review
https://doi.org/10.2138/am-2019-6740
Schlagwörter für diesen Artikel
MgSiO3; clinoenstatite; enstatite; pyroxene; single-crystal X‑ray diffraction

Artikel in diesem Heft

  1. Editorial
  2. Why scientists should study chess
  3. Highlights and Breakthroughs
  4. Neither antigorite nor its dehydration is “metastable”
  5. Geothermometry of the western half of the Central Metasedimentary Belt, Grenville Province, Ontario, and its implications
  6. Roebling Medal Paper
  7. An evolutionary system of mineralogy: Proposal for a classification of planetary materials based on natural kind clustering
  8. The composition and mineralogy of rocky exoplanets: A survey of >4000 stars from the Hypatia Catalog
  9. New insights into the zircon-reidite phase transition
  10. The effects of contrasting Ti and Al activities on Mn/Fe systematics in pyroxene from lunar mare basalts
  11. The condensation temperatures of the elements: A reappraisal
  12. Estimation of radiation damage in titanites using Raman spectroscopy
  13. The effect of incorporated carbonate and sodium on the IR spectra of A- and AB-type carbonated apatites
  14. Re-configuration and interaction of hydrogen sites in olivine at high temperature and high pressure
  15. The ascent of water-rich magma and decompression heating: A thermodynamic analysis
  16. High-pressure phase transitions of clinoenstatite
  17. Compressibility of two Na-rich clinopyroxenes: A synchrotron single-crystal X-ray diffraction study
  18. Book Review
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