Reply to Shaocheng Ji’s discussion on ‘Coesite-bearing eclogite breccia: implication for coseismic ultrahigh-pressure metamorphism and the rate of the process-by Yang et al. (Contrib. Mineral. Petrol., 2014, 167: 1013)

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• 作者：Jian-Jun Yang ; Meng-Xi Huang ; Hao-Ran Zhang…
• 关键词：Cataclasis ; Earthquake ; Eclogite breccia ; Intergranular coesite ; Quenching
• 刊名：Contributions to Mineralogy and Petrology
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：170
• 期：1
• 全文大小：724 KB
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  Yang J-J, Fan Z-F, Yu C, Yan R (2014a) Coseismic formation of eclogite facies cataclasite dykes at Yangkou in the Chinese Su-Lu UHP metamorphic belt. J Metamorph Geol 32:937-60. doi:10.-111/?jmg.-2101 View Article
  Yang J-J, Huang M-X, Wu Q-Y, Zhang H-R (2014b) Coesite-bearing eclogite breccia: implication for coseismic ultrahigh-pressure metamorphism and the rate of the process. Contrib Miner Petrol 167:1013-030. doi:10.-007/?s00410-014-1013-7 View Article
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• 作者单位：Jian-Jun Yang (1)
  Meng-Xi Huang (1)
  Hao-Ran Zhang (1)
  Cong Yu (1)
  
  1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beitucheng Xilu 19, P.O. Box 9825, Beijing, 100029, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Mineral Resources
  Mineralogy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0967

文摘

In his discussion, Ji ascribes our results to other workers and, using quotation marks, alleges statements that do not exist in our papers. We interpret some textures in the Yangkou eclogite breccia to be the result of rapid crystallization of local melts, but do not regard the entire breccia or the matrix to be pseudotachylyte. These, combined with the formation of the eclogite breccia from the coronitic eclogite wallrock and the preservation of intergranular coesite, imply transient (coseismic) high-pressure metamorphism. It is clearly indicated that the coesite-bearing eclogites followed a decompression and cooling path from about 3.3 GPa and 700?°C to about 0.3-.6 GPa and <375-00?°C, at which intergranular coesite and high-pressure microlites quenched. But Ji takes the pressure change to be from 3.3 to 1.2 GPa. The intercrystalline pressure vessel effect advocated by Ji for a compressed material should not be significant in subsequent decompression, particularly when considering the exhumation of intergranular coesite surrounded by fine omphacite grains in a deeply subducted slab.