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Pressure-induced slip-system transition in forsterite: Single-crystal rheological properties at mantle pressure and temperature

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Published/Copyright: January 7, 2016
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American Mineralogist
From the journal American Mineralogist Volume 92 Issue 8-9

Abstract

Deformation experiments were carried out in a Deformation-DIA high-pressure apparatus (D-DIA) on oriented Mg2SiO4 olivine (Fo100) single crystals, at pressure (P) ranging from 2.1 to 7.5 GPa, in the temperature (T) range 1373.1677 K, and in dry conditions. These experiments were designed to investigate the effect of pressure on olivine dislocation slip-system activities, responsible for the lattice-preferred orientations observed in the upper mantle. Two compression directions were tested, promoting either [100] slip alone or [001] slip alone in (010) crystallographic plane. Constant applied stress (σ) and specimen strain rates (ε) were monitored in situ using time-resolved X-ray synchrotron diffraction and radiography, respectively. Transmission electron microscopy (TEM) investigation of the run products reveals that dislocation creep assisted by dislocation climb and cross slip was responsible for sample deformation. A slip transition with increasing pressure, from a dominant [100]-slip to a dominant [001]-slip, is documented. Extrapolation of the obtained rheological laws to upper-mantle P, T, and σ conditions, suggests that [001]-slip activity becomes comparable to [100]-slip activity in the deep upper mantle, while [001] slip is mostly dominant in subduction zones. These results provide alternative explanations for the seismic anisotropy attenuation observed in the upper mantle, and for the “puzzling” seismic-anisotropy anomalies commonly observed in subduction zones

Keywords: Upper mantle; olivine; high pressure; slip systems; rheological law; seismic anisotropy; subduction zone
Received: 2006-10-9
Accepted: 2007-4-14
Published Online: 2016-1-7
Published in Print: 2007-8-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2007.2474
Keywords for this article
Upper mantle; olivine; high pressure; slip systems; rheological law; seismic anisotropy; subduction zone

Articles in the same Issue

  1. Occurrence and origin of minerals in a chamosite-bearing coal of Late Permian age, Zhaotong, Yunnan, China
  2. Crystal-chemical and carbon-isotopic characteristics of karpatite (C24H12) from the Picacho Peak Area, San Benito County, California: Evidences for the hydrothermal formation
  3. Single-crystal X-ray diffraction study of high-pressure phases of KHCO3
  4. Stress-induced redistribution of yttrium and heavy rare-earth elements (HREE) in garnet during high-grade polymetamorphism
  5. The role of volatile transport by diffusion and dispersion in driving biotite-forming reactions during regional metamorphism of the Gile Mountain Formation, Vermont
  6. Laser Raman microspectrometry of metamorphic quartz: A simple method for comparison of metamorphic pressures
  7. Al,Si order in albite and its effect on albite dissolution processes: A Monte Carlo study
  8. Structural state of microcrystalline opals: A Raman spectroscopic study
  9. A Monte Carlo investigation of the thermodynamics of cation ordering in 2-3 spinels
  10. Modeling the plastic deformation of olivine by dislocation dynamics simulations
  11. Heat capacity of hydration in zeolites
  12. Imaging of dioctahedral 2:1 layers by high-resolution transmission electron microscopy (HRTEM): Possibility of recording the dehydroxylate
  13. Geochemical variations in late-stage growth of volcanic phenocrysts revealed by SIMS depth-profiling
  14. Characterization of mineral surfaces using FIB and TEM: A case study of naturally weathered alkali feldspars
  15. Crystal structure and chemical composition of Li-, Fe-, and Mn-rich micas
  16. Microbial effects in promoting the smectite to illite reaction: Role of organic matter intercalated in the interlayer
  17. Microbial reduction of structural Fe3+ in nontronite by a thermophilic bacterium and its role in promoting the smectite to illite reaction
  18. Unique properties of lunar impact glass: Nanophase metallic Fe synthesis
  19. Aluminotaramite, alumino-magnesiotaramite, and fluoro-alumino-magnesiotaramite: Mineral data and crystal chemistry
  20. Pressure-induced slip-system transition in forsterite: Single-crystal rheological properties at mantle pressure and temperature
  21. Elastic behavior and pressure-induced structural evolution of nepheline: Implications for the nature of the modulated superstructure
  22. Pressure-induced change in the compressional behavior of the O-H bond in chrysotile: A Raman high-pressure study up to 4.5 GPa
  23. Jarosite-hydronium jarosite solid-solution series with full iron site occupancy: Mineralogy and crystal chemistry
  24. Hydrogen bonded silanols in the 10 Å phase: Evidence from NMR spectroscopy
  25. Mössbauer spectroscopy of Zn-poor and Zn-rich rhodonite
  26. The crystal structure of pyroxenes along the jadeite hedenbergite and jadeite aegirine joins
  27. Temperature dependence of IR absorption of hydrous/hydroxyl species in minerals and synthetic materials
  28. The crystal structure of meurigite
  29. Yakovenchukite-(Y), K3NaCaY2(Si12O30)(H2O)4, a new mineral from the Khibiny massif, Kola Peninsula, Russia: A novel type of octahedral-tetrahedral open-framework structure
  30. Letter. Novel 2:1 structure of phyllosilicates formed by annealing Fe3+, Mg-rich dioctahedral mica
  31. Letter. Experimental study of radium partitioning between anorthite and melt at 1 atm
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