Volume 33 Issue 5
Sep.  2008
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Article Navigation >  Earth Science  > 2008  >  33(5): 706-715
MENG Da-wei, WU Xiu-ling, SUN Fan, LIU Fu, ZHENG Jian-ping, 2008. Identification of α-PbO2-Type TiO2 in Jadeite Quartzite from Shuanghe, Dabie Mountains, China. Earth Science, 33(5): 706-715.
Citation: MENG Da-wei, WU Xiu-ling, SUN Fan, LIU Fu, ZHENG Jian-ping, 2008. Identification of α-PbO2-Type TiO2 in Jadeite Quartzite from Shuanghe, Dabie Mountains, China. Earth Science, 33(5): 706-715.
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Identification of α-PbO2-Type TiO2 in Jadeite Quartzite from Shuanghe, Dabie Mountains, China

  • 1.

    Faculty of Materials Science and Chemical Engineering, China University of Geosciences, Wuhan 430074, China

  • 2.

    Electron Microscope Centre, Wuhan University, Wuhan 430072, China

  • 3.

    Chinese State Key Laboratory of Lithosp here Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

  • 4.

    State Key Laboratory of Geological Processes and Mineral Resources and Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

  • 5.

    Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

  • Received Date: 2008-02-16
  • Publish Date: 2008-09-25
    Abstract
  • The depth of the continental deep subduction is of vital importance for better understanding of the dynamics of exhumation process of ultrahigh pressure metamorphic rocks in the continental collision orogen belt. The crystal of α-PbO2-type TiO2 was found in omphacite from coesite-bearing eclogite at Shima in the Dabie Mountains, China. A natural ultrahigh-pressure phase of titanium oxide with α-PbO2-structure has been identified through high-resolution transmission electron microscopy (HRTEM) and energy-dispersive X-ray spectrometer (EDS) in jadeite quartzite at Shuanghe in the Dabie Mountains, China. The reservation of nano-scale lamellae of the α-PbO2-type polymorph of TiO2 provides a new evidence of ultra high-pressure, metamorphism at 6-7GPa, 730-870℃. It implies a burial of continental crustal rocks to depth between 170-200 kilometers or deeper, and also implies exhumation of subducted continental crust to the Earth′s surface was presumably rapid, though at an uncertain rate.

     

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