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《Earth Science-journal of China University of Geosciences》 2001-06
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RHEOLOGICAL STRENGTH OF UHP ECLOGITE FROM DABIE SHAN: EVIDENCES FROM HIGH p-T EXPERIMENTS

Jin Zhenmin 1,2 , Zhang Junfeng 1,2 , Green H W 2, Jin Shuyan 1, Wang Yongfeng 1 (1.Faculty of Earth Sciences, China University of Geosciences, Wuhan430074; 2.Institute of Geophysics & Planetary Physics, University of California, Riverside, CA  
The authors present here experimental study of the rheological properties of UHP eclogite from Dabie at a pressure of 3 GPa by utilizing the 5 GPa Griggs-type piston cylinder apparatus. The rheological constitutive equation of eclogite is determined with a stress exponent of 3.4, an activation energy of 480 kJ/mol and a pre-exponential factor of 10 3.3 . The study shows that: (1) As a typical two-phase rock, the flow strength of eclogite depends on the proportions between the strong phase (garnet) and the weak phase (omphacite); (2) The plastic deformation of eclogite is dominated by dislocation creep; (3) The research result that eclogite has the same strength as does the upper mantle harzburgite suggests that the delamination of the subducting crust component from the underlying upper mantle is unlikely. Therefore, the stretching after the collision orogeny coupled with the upwelling of the upper mantle might play a more important role in the exhumation of UHP rocks.
【Fund】: 国家重点基础研究发展规划 (G199990 75 5 0 1) ;; 大陆科学钻探项目 ;; 中国地质大学壳-幔开放实验室基金 ;; 美国自然科学基金(EAR -972 5 5 75 )资助
【CateGory Index】: P588.3
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