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Volume 14 Issue 2
Jun 2003
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Lu Wang, Zhenmin Jin, Mouchun He. Raman Spectrum Study on Quartz Exsolution in Omphacite of Eclogite and Its Tectonic Significances. Journal of Earth Science, 2003, 14(2): 119-126.
Citation: Lu Wang, Zhenmin Jin, Mouchun He. Raman Spectrum Study on Quartz Exsolution in Omphacite of Eclogite and Its Tectonic Significances. Journal of Earth Science, 2003, 14(2): 119-126.

Raman Spectrum Study on Quartz Exsolution in Omphacite of Eclogite and Its Tectonic Significances

Funds:

Chinese National Key Project for Basic Research G1999075501

  • Received Date: 20 Dec 2002
  • Accepted Date: 10 Mar 2003
  • The studies on ultra microstructure characteristics of quartz exsolution in eclogite and coesite in UHP eclogite of several localities are done with the appliance of laser Raman spectroscopy and U stage. Research results show that the phase transformation of coesite quartz in garnet and/or omphacite is a continuous process. Topological relationship is present between quartz exsolution in omphacite and its host mineral which shows orientations of two long axes of quartz exsolution parallel to (100) and (-101) of omphacite. At present, some scholars suggest that the quartz exsolution in omphacite of eclogite is the evidence of UHP metamorphism. However, temperature and pressure condition and the exsolution mechanism of oriented needlelike quartz in omphacite still remain unclear. Therefore, further study should be enhanced on experimental research on exsolution mechanism of super silicate clinopyroxene, which could provide experimental quantitative constraint on quartz exsolution as UHP indicator.

     

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