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Relict coesite exsolution in omphacite from Western Tianshan eclogites, China

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Published/Copyright: March 28, 2015
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American Mineralogist
From the journal American Mineralogist Volume 90 Issue 1

Abstract

Exsolution rods of relict coesite together with quartz were identified in omphacite in eclogites from western Tianshan, China. They are oriented along the c-axis of the host clinopyroxenes and have grain size up to 30 μm long and 2.3 μm wide. Raman spectra of exsolved lamellae yield consistent but weak bands at 521, 270, 181, 151, and 118 cm-1, typical for coesite, in addition to those of quartz and the host omphacite. Such occurrences together with textured observations suggest a two-stage evolution of SiO2 exsolution rods in omphacite. Lamellae of coesite were apparently exsolved from supersilicic omphacite at P ≈ 5.0 GPa and the transformation from coesite to quartz occurred during retrograde metamorphism.

Received: 2003-12-20
Accepted: 2004-8-3
Published Online: 2015-3-28
Published in Print: 2005-1-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Contact metamorphism of the White Mountain Peak metavolcanic complex, eastern California
  2. Structure and luminescence characteristics of quartz from pegmatites
  3. Evidence for monazite-, barite-, and AgMnO4 (distorted barite)-type structures of CaSO4 at high pressure and temperature
  4. The “template” effect of the extra-framework content on zeolite compression: The case of yugawaralite
  5. The influence of OH in coesite on the kinetics of the coesite-quartz phase transition
  6. First-principles study of hydrogen bond symmetrization of phase D under high pressure
  7. First-principles study of OH-stretching modes in kaolinite, dickite, and nacrite
  8. A systematic study of OH in hydrous wadsleyite from polarized FTIR spectroscopy and single-crystal X-ray diffraction: Oxygen sites for hydrogen storage in Earthʼs interior
  9. Determination of the content and distribution of fixed ammonium in illite-smectite using a modified X-ray diffraction technique: Application to oil source rocks of western Greenland
  10. Determination of defect structures in kaolin minerals by high-resolution transmission electron microscopy (HRTEM)
  11. Mössbauer spectroscopy of omphacite and garnet pairs from eclogites: Application to geothermobarometry
  12. Allanite and epidote weathering at the Coweeta Hydrologic Laboratory, western North Carolina, U.S.A.
  13. Ca2SiO3OHF—A high-pressure phase with dense calcium polyhedral packing and tetrahedral silicon
  14. Relationships between SEM-cathodoluminescence response and trace-element composition of hydrothermal vein quartz
  15. Quantitative evaluation of attenuation contrast of X-ray computed tomography images using monochromatized beams
  16. Biotic and abiotic products of Mn(II) oxidation by spores of the marine Bacillus sp. strain SG-1
  17. The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene
  18. Crystal structures of chalcostibite (CuSbS2) and emplectite (CuBiS2): Structural relationship of stereochemical activity between chalcostibite and emplectite
  19. Hydration and swelling of synthetic Na-saponites: Influence of layer charge
  20. Dehydroxylation and CO2 incorporation in annealed mica (sericite): An infrared spectroscopic study
  21. Relict coesite exsolution in omphacite from Western Tianshan eclogites, China
  22. Hyperfine electric field gradients and local distortion environments of octahedrally coordinated Fe2+
  23. A synchrotron Mössbauer spectroscopy study of (Mg,Fe)SiO3 perovskite up to 120 GPa
  24. Temporal stability and pressure calibration of barium carbonate and talc/pyrex pressure media in a piston-cylinder apparatus
  25. Cation ordering in magnesioferrite, MgFe2O4, to 982 °C using in situ synchrotron X-ray powder diffraction
  26. Halite-sylvite thermoconsolution
  27. The role of water in the structures of synthetic hallimondite, Pb2[(UO2)(AsO4)2](H2O)n and synthetic parsonsite, Pb2[(UO2)(PO4)2](H2O)n, 0 ≤ n ≤ 0.5
  28. Variable-temperature structural studies of tetranatrolite from Mt. Saint-Hilaire: Synchrotron X-ray powder diffraction and Rietveld analysis
  29. Letter. Pressure-induced stabilization of ordered paranatrolite: A new insight into the paranatrolite controversy
  30. Letter. The effect of zinc sulfide on phase transformations of ferrihydrite
  31. Letter. Stability and equation of state of MgGeO3 post-perovskite phase
  32. Letter. Pressure dependence of the OH-stretching mode in F-rich natural topaz and topaz-OH
https://doi.org/10.2138/am.2005.1587

Articles in the same Issue

  1. Contact metamorphism of the White Mountain Peak metavolcanic complex, eastern California
  2. Structure and luminescence characteristics of quartz from pegmatites
  3. Evidence for monazite-, barite-, and AgMnO4 (distorted barite)-type structures of CaSO4 at high pressure and temperature
  4. The “template” effect of the extra-framework content on zeolite compression: The case of yugawaralite
  5. The influence of OH in coesite on the kinetics of the coesite-quartz phase transition
  6. First-principles study of hydrogen bond symmetrization of phase D under high pressure
  7. First-principles study of OH-stretching modes in kaolinite, dickite, and nacrite
  8. A systematic study of OH in hydrous wadsleyite from polarized FTIR spectroscopy and single-crystal X-ray diffraction: Oxygen sites for hydrogen storage in Earthʼs interior
  9. Determination of the content and distribution of fixed ammonium in illite-smectite using a modified X-ray diffraction technique: Application to oil source rocks of western Greenland
  10. Determination of defect structures in kaolin minerals by high-resolution transmission electron microscopy (HRTEM)
  11. Mössbauer spectroscopy of omphacite and garnet pairs from eclogites: Application to geothermobarometry
  12. Allanite and epidote weathering at the Coweeta Hydrologic Laboratory, western North Carolina, U.S.A.
  13. Ca2SiO3OHF—A high-pressure phase with dense calcium polyhedral packing and tetrahedral silicon
  14. Relationships between SEM-cathodoluminescence response and trace-element composition of hydrothermal vein quartz
  15. Quantitative evaluation of attenuation contrast of X-ray computed tomography images using monochromatized beams
  16. Biotic and abiotic products of Mn(II) oxidation by spores of the marine Bacillus sp. strain SG-1
  17. The Mn, Mg-intracrystalline exchange reaction in donpeacorite (Mn0.54Ca0.03Mg1.43Si2O6) and its relation to the fractionation behavior of Mn in Fe, Mg-orthopyroxene
  18. Crystal structures of chalcostibite (CuSbS2) and emplectite (CuBiS2): Structural relationship of stereochemical activity between chalcostibite and emplectite
  19. Hydration and swelling of synthetic Na-saponites: Influence of layer charge
  20. Dehydroxylation and CO2 incorporation in annealed mica (sericite): An infrared spectroscopic study
  21. Relict coesite exsolution in omphacite from Western Tianshan eclogites, China
  22. Hyperfine electric field gradients and local distortion environments of octahedrally coordinated Fe2+
  23. A synchrotron Mössbauer spectroscopy study of (Mg,Fe)SiO3 perovskite up to 120 GPa
  24. Temporal stability and pressure calibration of barium carbonate and talc/pyrex pressure media in a piston-cylinder apparatus
  25. Cation ordering in magnesioferrite, MgFe2O4, to 982 °C using in situ synchrotron X-ray powder diffraction
  26. Halite-sylvite thermoconsolution
  27. The role of water in the structures of synthetic hallimondite, Pb2[(UO2)(AsO4)2](H2O)n and synthetic parsonsite, Pb2[(UO2)(PO4)2](H2O)n, 0 ≤ n ≤ 0.5
  28. Variable-temperature structural studies of tetranatrolite from Mt. Saint-Hilaire: Synchrotron X-ray powder diffraction and Rietveld analysis
  29. Letter. Pressure-induced stabilization of ordered paranatrolite: A new insight into the paranatrolite controversy
  30. Letter. The effect of zinc sulfide on phase transformations of ferrihydrite
  31. Letter. Stability and equation of state of MgGeO3 post-perovskite phase
  32. Letter. Pressure dependence of the OH-stretching mode in F-rich natural topaz and topaz-OH
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