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LIU Shu-E, XU Da-Peng, LIU Xiao-Mei, SU Wen-Hui, XUE Yan-Feng, SUN Jing-Shu. Modelling Synthesis in Laboratory of Coesite in the Earth's Crust and Its Formation Mechanism[J]. Chinese Journal of High Pressure Physics, 2006, 20(2): 163-171 . doi: 10.11858/gywlxb.2006.02.009
Citation: LIU Shu-E, XU Da-Peng, LIU Xiao-Mei, SU Wen-Hui, XUE Yan-Feng, SUN Jing-Shu. Modelling Synthesis in Laboratory of Coesite in the Earth's Crust and Its Formation Mechanism[J]. Chinese Journal of High Pressure Physics, 2006, 20(2): 163-171 . doi: 10.11858/gywlxb.2006.02.009

Modelling Synthesis in Laboratory of Coesite in the Earth's Crust and Its Formation Mechanism

doi: 10.11858/gywlxb.2006.02.009
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  • Corresponding author: SU Wen-Hui
  • Received Date: 18 Jan 2005
  • Rev Recd Date: 25 Apr 2005
  • Publish Date: 05 Jun 2006
  • The factors of collision and shear stress in the coesite formation has not been considered in the condition of high static pressure that was the base of the hypothesis of subduction-return of slab in the Earth. After considered these factors, a laboratory method of combining the high-energy mechanical ball milling ( HEMBM ) and high static pressure was suggested in this paper for modelling synthesis of coesite in the Earth's crust. A mechanical collision-induced intermediate phase of -quartz has been discovered. Its condition of easily crystallizing into coesite induced by high static pressure is 3.0 GPa, 932 K, and 1.0 min. The Raman peaks for the coesite synthesized by the present method have covered over the all information of those natural and synthesized coesite obtained before. This implicated that the coesite in the Earth's crust and subduction-return of slab maybe not come from as deep as common accepted value because of its lower pressure 3.0 GPa than that suggested by Jr. L . Coes. However, according to the fact discovered in this paper that the coesite could be synthesized under a condition of very short time (about 10 s) by the high static pressure after pre-treated of HEMBM, the intermediate phase of -quartz could be transformed into coesite instantaneously by the interaction of an earthquake wave and/or stress. Therefore we suggest some other possible formation mechanisms for coesite in the Earth's crust and show that the coesite in the Earth's crust could record some information about the collision dynamics of plates and an earthquake wave.

     

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