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Volume 27 Issue 4
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Chinese Journal of High Pressure Physics  > 2013  >  27(4): 481-489.
JIANG Xi, ZHOU Wen-Ge, XIE Hong-Sen, LIU Yong-Gang, FAN Da-Wei. Compressional and Shear Wave Velocities of Rock Glasses up to 2.0 GPa and 1 000 ℃[J]. Chinese Journal of High Pressure Physics, 2013, 27(4): 481-489. doi: 10.11858/gywlxb.2013.04.002
Citation: JIANG Xi, ZHOU Wen-Ge, XIE Hong-Sen, LIU Yong-Gang, FAN Da-Wei. Compressional and Shear Wave Velocities of Rock Glasses up to 2.0 GPa and 1 000 ℃[J]. Chinese Journal of High Pressure Physics, 2013, 27(4): 481-489. doi: 10.11858/gywlxb.2013.04.002
shu

Compressional and Shear Wave Velocities of Rock Glasses up to 2.0 GPa and 1 000 ℃

doi: 10.11858/gywlxb.2013.04.002
  • 1.

    College of Resources and Environmental Engineering, Guizhou University, Guiyang 550003, China;

  • 2.

    The Division of the Earth‘s Interior Materials and Fluid Interaction Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China

  • Received Date: 08 Oct 2011
  • Rev Recd Date: 01 Apr 2012
  • Publish Date: 15 Aug 2013
    Abstract
  • Measurements of compressional and shear wave velocities (vp and vs) under pressure from 0.4 to 2.0 GPa were performed on seven types of synthetic glasses, including basalt, andesite, dacite, amphibolite, pyroxenite, rhyolite and gneiss. At confining pressure of 2.0 GPa, the wave velocities were also measured as functions of temperature up to 1 000 ℃ for compressional wave velocity (vp) and up to 730 ℃ for shear wave velocity (vs). At room temperature, the wave velocities of the glasses decrease anomalously with pressure, as a result of the open structure of SiO2 in silica-rich glasses. With varying SiO2 mass fraction in the glasses from 87% to 52%, dvp/dp increases from -0.159 to 0.050 m/(sPa), and dvs/dp increases from -0.114 to -0.001 m/(sPa). At 2.0 GPa, vp and vs of the glasses decrease slowly first up to 600-700 ℃, indicating the glass transition temperatures (Tg), and then decrease rapidly. Based on the elastic properties of basalt glass and mantle rocks, it is concluded that the basalt glass with volume fraction of about 20% in matrix can cause the low velocity zone in upper mantle.

     

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