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Letter. α-PbO2-type nanophase of TiO2 from coesite-bearing eclogite in the Dabie Mountains, China

  • Xiuling Wu , Dawei Meng EMAIL logo and Yujing Han
Published/Copyright: March 28, 2015
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American Mineralogist
From the journal American Mineralogist Volume 90 Issue 8-9

Abstract

A natural high-pressure phase of titanium oxide with α-PbO2-structure has been found in omphacite from coesite-bearing eclogite at Shima in the Dabie Mountains, China. High-resolution transmission electron microscope observations have revealed an orthorhombic lattice, corresponding to α-PbO2- type TiO2 with cell parameters a = 0.461 nm, b = 0.540 nm, c = 0.497 nm and space group Pbcn. It occurs as nanometer-thick (<2 nm) lamellae between multiple twinned rutile crystals, providing additional evidence of very high-pressure, metamorphism at 7 GPa, 900°C. This implies subduction of continental material to a depth of more than 200 kilometers. α-PbO2-type TiO2 could be an extremely useful index mineral for ultrahigh-pressure

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

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Crystal-size and shape distributions of magnetite from uncultured magnetotactic bacteria as a potential biomarker
  2. Tourmaline-bearing rocks in the Singhbhum shear zone, eastern India: Evidence of boron infiltration during regional metamorphism
  3. High-resolution transmission electron microscopy (HRTEM) study of the 4a and 6a superstructure of bornite Cu5FeS4
  4. Possible Fe/Cu ordering schemes in the 2a superstructure of bornite (Cu5FeS4)
  5. TEM-specimen preparation of cell/mineral interfaces by Focused Ion Beam milling
  6. Direct observation of spinodal decomposition in the magnetite-hercynite system by susceptibility measurements and transmission electron microscopy
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  9. Structure change of MgSiO3, MgGeO3, and MgTiO3 ilmenites under compression
  10. Dehydration processes in the meta-autunite group minerals meta-autunite, metasaléeite, and metatorbernite
  11. Investigation of the martensitic-like transformation from Mg2GeO4 olivine to its spinel structure polymorph
  12. A high-temperature diffraction study of the solid solution CaTiOSiO4-CaTiOGeO4
  13. The vibrational spectrum of synthetic hydrogrossular (katoite) Ca3Al2(O4H4)3: A low-temperature IR and Raman spectroscopic study
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  18. Structure and the extent of disorder in quaternary (Ca-Mg and Ca-Na) aluminosilicate glasses and melts
  19. Makarochkinite, Ca2Fe42+Fe3+TiSi4BeAlO20, a new beryllosilicate member of the aenigmatite-sapphirine-surinamite group from the Ilʼmen Mountains (southern Urals), Russia
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  21. Crystal-size distributions of garnets in metapelites from the northeastern Bushveld contact aureole, South Africa
  22. Early diagenetic origin of Al phosphate-sulfate minerals (woodhouseite and crandallite series) in terrestrial sandstones, Nova Scotia, Canada
  23. Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences
  24. Letter. The effect of Fictive temperature on Al coordination in high-pressure (10 GPa) sodium aluminosilicate glasses
  25. Letter. α-PbO2-type nanophase of TiO2 from coesite-bearing eclogite in the Dabie Mountains, China
  26. Letter. Morphological characteristics of ordered kaolinite: Investigation using electron back-scattered diffraction
https://doi.org/10.2138/am.2005.1901

Articles in the same Issue

  1. Crystal-size and shape distributions of magnetite from uncultured magnetotactic bacteria as a potential biomarker
  2. Tourmaline-bearing rocks in the Singhbhum shear zone, eastern India: Evidence of boron infiltration during regional metamorphism
  3. High-resolution transmission electron microscopy (HRTEM) study of the 4a and 6a superstructure of bornite Cu5FeS4
  4. Possible Fe/Cu ordering schemes in the 2a superstructure of bornite (Cu5FeS4)
  5. TEM-specimen preparation of cell/mineral interfaces by Focused Ion Beam milling
  6. Direct observation of spinodal decomposition in the magnetite-hercynite system by susceptibility measurements and transmission electron microscopy
  7. Thermodynamics of uranyl minerals: Enthalpies of formation of rutherfordine, UO2CO3, andersonite, Na2CaUO2(CO3)3(H2O)5, and grimselite, K3NaUO2(CO3)3H2O
  8. Mixing and ordering behavior in manganocolumbite-ferrocolumbite solid solution: A single-crystal X-ray diffraction study
  9. Structure change of MgSiO3, MgGeO3, and MgTiO3 ilmenites under compression
  10. Dehydration processes in the meta-autunite group minerals meta-autunite, metasaléeite, and metatorbernite
  11. Investigation of the martensitic-like transformation from Mg2GeO4 olivine to its spinel structure polymorph
  12. A high-temperature diffraction study of the solid solution CaTiOSiO4-CaTiOGeO4
  13. The vibrational spectrum of synthetic hydrogrossular (katoite) Ca3Al2(O4H4)3: A low-temperature IR and Raman spectroscopic study
  14. Structural characterization of biogenic Mn oxides produced in seawater by the marine bacillus sp. strain SG-1
  15. Investigation of smectite hydration properties by modeling experimental X-ray diffraction patterns: Part I. Montmorillonite hydration properties
  16. Synthesis and crystal-chemistry of alkali amphiboles in the system Na2O-MgO-FeO-Fe2O3- SiO2-H2O as a function of fO2
  17. Compositional zoning in sphalerite crystals
  18. Structure and the extent of disorder in quaternary (Ca-Mg and Ca-Na) aluminosilicate glasses and melts
  19. Makarochkinite, Ca2Fe42+Fe3+TiSi4BeAlO20, a new beryllosilicate member of the aenigmatite-sapphirine-surinamite group from the Ilʼmen Mountains (southern Urals), Russia
  20. Formation of lava stalactites in the master tube of the 1792-1793 flow field, Mt. Etna (Italy)
  21. Crystal-size distributions of garnets in metapelites from the northeastern Bushveld contact aureole, South Africa
  22. Early diagenetic origin of Al phosphate-sulfate minerals (woodhouseite and crandallite series) in terrestrial sandstones, Nova Scotia, Canada
  23. Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences
  24. Letter. The effect of Fictive temperature on Al coordination in high-pressure (10 GPa) sodium aluminosilicate glasses
  25. Letter. α-PbO2-type nanophase of TiO2 from coesite-bearing eclogite in the Dabie Mountains, China
  26. Letter. Morphological characteristics of ordered kaolinite: Investigation using electron back-scattered diffraction
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