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Volume 21 Issue 5
Oct 2010
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Article Contents
Benxun Su, Hongfu Zhang, Sakyi Patrick Asamoah, Kezhang Qin, Yanjie Tang, Jifeng Ying, Yan Xiao. Garnet-Spinel Transition in the Upper Mantle: Review and Interpretation. Journal of Earth Science, 2010, 21(5): 635-640. doi: 10.1007/s12583-010-0117-x
Citation: Benxun Su, Hongfu Zhang, Sakyi Patrick Asamoah, Kezhang Qin, Yanjie Tang, Jifeng Ying, Yan Xiao. Garnet-Spinel Transition in the Upper Mantle: Review and Interpretation. Journal of Earth Science, 2010, 21(5): 635-640. doi: 10.1007/s12583-010-0117-x

Garnet-Spinel Transition in the Upper Mantle: Review and Interpretation

doi: 10.1007/s12583-010-0117-x
Funds:

the Special Research Project of the State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences 1008

the National Natural Science Foundation of China 90714008

More Information
  • Corresponding author: Zhang Hongfu, hfzhang@mail.igcas.ac.cn
  • Received Date: 20 May 2010
  • Accepted Date: 25 Jun 2010
  • Publish Date: 01 Oct 2010
  • This study carried out a comprehensive review of mantle-derived garnet peridotites on the basis of their garnet-spinel compositional relationships. The P-T estimates of the garnet peridotites of both orogenic and xenolithic derivations confirm previously established two garnet-spinel transition (GST) zones. Results of natural samples and experimental studies of all the garnet peridotites plot below the first GST at low P (< 2 GPa). The second GST at high P (6-10 GPa), obtained from the experimental system (MgO-Cr2O3-SiO2), was firstly evidenced from natural samples in this study and may imply a challenge to our understanding of Cr-rich and Al-poor mineral phase transition under ultrahigh P condition. Based on the data and our estimates, we propose the existence of another GST within the garnet peridotite discontinuous zone and a potential spinel-phase peridotite zone in the upper mantle.

     

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