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Pressure-induced velocity softening in natural orthopyroxene at mantle temperature

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Veröffentlicht/Copyright: 27. Juli 2019
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 104 Heft 8

Abstract

In this study, we have measured the compressional and shear wave velocities of (Mg1.77Fe0.22Ca0.01) Si2O6 natural orthopyroxene up to 13.5 GPa and 873 K using ultrasonic interferometry in conjunction with in situ synchrotron X-ray diffraction and imaging techniques. Previous acoustic experiments on orthoenstatite (OEn) MgSiO3 indicated that both compressional and shear velocities (VP and VS) of OEn undergo continuous velocity softening above 9 GPa at room temperature, which has been attributed to the phase transition from OEn to the metastable, high-pressure clinoenstatite HPCEn2. For the first time, our results suggest that pressure-induced velocity softening can occur in natural orthopyroxene at high-temperature conditions relevant to the Earth’s cold subduction zones. Estimates of the impedance and velocity contrasts between orthopyroxene (Opx) and high-pressure clinopyroxene (HPCpx) have been calculated, and the possibility of this phase transformation being a plausible candidate for seismic X-discontinuities at depth around 250–350 km is re-evaluated.

Keywords: Orthopyroxene; velocity softening; high pressure and high temperature; ultrasonic interferometry

Acknowledgments

The authors thank Yanbin Wang and Tony Yu for help in conducting the ultrasonic experiment at the Advanced Photon Source and David Welch for valuable discussions. Ting Chen thanks the Geodynamic Research Center (Ehime University, Japan) for a summer internship during which the SEM analysis was done.

  1. Funding: This project is supported by the National Science Foundation (EAR-1524078) and DOE-NNSA (DE-NA0002907). GeoSoilEnviroCARS is supported by the National Science Foundation—Earth Sciences (EAR-1634415) and Department of Energy-GeoSciences (DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, 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. MPI publication number 510.

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Received: 2018-12-20
Accepted: 2019-05-06
Published Online: 2019-07-27
Published in Print: 2019-08-27

© 2019 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. MSA Presidential Address
  2. Metamorphism and the evolution of subduction on Earth
  3. Experimental investigation of FeCO3 (siderite) stability in Earth’s lower mantle using XANES spectroscopy
  4. Comparison of fluid processes in coexisting wolframite and quartz from a giant vein-type tungsten deposit, South China: Insights from detailed petrography and LA-ICP-MS analysis of fluid inclusions
  5. Monazite and xenotime solubility in hydrous, boron-bearing rhyolitic melt
  6. Solving the iron quantification problem in low-kV EPMA: An essential step toward improved analytical spatial resolution in electron probe microanalysis—Olivines
  7. Transition metals in komatiitic olivine: Proxies for mantle composition, redox conditions, and sulfide mineralization potential
  8. Formation of saponite by hydrothermal alteration of metal oxides: Implication for the rarity of hydrotalcite
  9. Near end-member shenzhuangite, NiFeS2, found in Muong Nong-type tektites from Laos
  10. Pressure-induced velocity softening in natural orthopyroxene at mantle temperature
  11. The role of mineral nanoparticles at a fluid-magnetite interface: Implications for trace-element uptake in hydrothermal systems
  12. Melting temperature depression due to the electronic spin transition of iron
  13. Epidote spherulites and radial euhedral epidote aggregates in a greenschist facies metavolcanic breccia hosting an UHP eclogite in Dabieshan (China): Implication for dynamic metamorphism
  14. A new (Mg0.5Fe0.53+)(Si0.5Al0.53+)O3 LiNbO3-type phase synthesized at lower mantle conditions
https://doi.org/10.2138/am-2019-6935
Schlagwörter für diesen Artikel
Orthopyroxene; velocity softening; high pressure and high temperature; ultrasonic interferometry

Artikel in diesem Heft

  1. MSA Presidential Address
  2. Metamorphism and the evolution of subduction on Earth
  3. Experimental investigation of FeCO3 (siderite) stability in Earth’s lower mantle using XANES spectroscopy
  4. Comparison of fluid processes in coexisting wolframite and quartz from a giant vein-type tungsten deposit, South China: Insights from detailed petrography and LA-ICP-MS analysis of fluid inclusions
  5. Monazite and xenotime solubility in hydrous, boron-bearing rhyolitic melt
  6. Solving the iron quantification problem in low-kV EPMA: An essential step toward improved analytical spatial resolution in electron probe microanalysis—Olivines
  7. Transition metals in komatiitic olivine: Proxies for mantle composition, redox conditions, and sulfide mineralization potential
  8. Formation of saponite by hydrothermal alteration of metal oxides: Implication for the rarity of hydrotalcite
  9. Near end-member shenzhuangite, NiFeS2, found in Muong Nong-type tektites from Laos
  10. Pressure-induced velocity softening in natural orthopyroxene at mantle temperature
  11. The role of mineral nanoparticles at a fluid-magnetite interface: Implications for trace-element uptake in hydrothermal systems
  12. Melting temperature depression due to the electronic spin transition of iron
  13. Epidote spherulites and radial euhedral epidote aggregates in a greenschist facies metavolcanic breccia hosting an UHP eclogite in Dabieshan (China): Implication for dynamic metamorphism
  14. A new (Mg0.5Fe0.53+)(Si0.5Al0.53+)O3 LiNbO3-type phase synthesized at lower mantle conditions
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