大别山超高压榴辉岩流变强度——来自高温高压实验的证据

金振民; 章军锋; GreenH.W.; 金淑燕; 王永锋

Volume 26 Issue 6

Jun. 2001

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Article Navigation > Earth Science > 2001 > 26(6): 574-580

JIN Zhenmin, ZHANG Junfeng, Green H.W., JIN Shuyan, WANG Yongfeng, 2001. RHEOLOGICAL STRENGTH OF UHP ECLOGITE FROM DABIE SHAN: EVIDENCES FROM HIGH p-T EXPERIMENTS. Earth Science, 26(6): 574-580.

Citation:

JIN Zhenmin, ZHANG Junfeng, Green H.W., JIN Shuyan, WANG Yongfeng, 2001. RHEOLOGICAL STRENGTH OF UHP ECLOGITE FROM DABIE SHAN: EVIDENCES FROM HIGH p-T EXPERIMENTS. Earth Science, 26(6): 574-580.

JIN Zhenmin, ZHANG Junfeng, Green H.W., JIN Shuyan, WANG Yongfeng, 2001. RHEOLOGICAL STRENGTH OF UHP ECLOGITE FROM DABIE SHAN: EVIDENCES FROM HIGH p-T EXPERIMENTS. Earth Science, 26(6): 574-580.

Citation:

JIN Zhenmin, ZHANG Junfeng, Green H.W., JIN Shuyan, WANG Yongfeng, 2001. RHEOLOGICAL STRENGTH OF UHP ECLOGITE FROM DABIE SHAN: EVIDENCES FROM HIGH p-T EXPERIMENTS. Earth Science, 26(6): 574-580.

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RHEOLOGICAL STRENGTH OF UHP ECLOGITE FROM DABIE SHAN: EVIDENCES FROM HIGH p-T EXPERIMENTS

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074
2.
Institute of Geophysics & Planetary Physics, University of California, Riverside, CA 92521, USA

Publish Date: 2001-11-25

Abstract

Abstract

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.
- UHP eclogite,
- rheological strength,
- dislocation creep,
- high pressure and temperature experiment,
- delamination,
- Dabie Shan

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References(28)

References

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