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Volume 15 Issue 2
Jun 2004
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Ruixun Liu, Guxian Lü, Fangzheng Wang, Changshan Wei, Chusun Guo. Mechanical Nature of Gravity and Tectonic Forces. Journal of Earth Science, 2004, 15(2): 152-154.
Citation: Ruixun Liu, Guxian Lü, Fangzheng Wang, Changshan Wei, Chusun Guo. Mechanical Nature of Gravity and Tectonic Forces. Journal of Earth Science, 2004, 15(2): 152-154.

Mechanical Nature of Gravity and Tectonic Forces

Funds:

the Major Science and Technology Development Program 2002201

the Ministry of Land and Resources, Program of Knowledge Renovation KZCX-2-SW-119

Chinese Academy of Sciences and the National Natural Science Foundation of China 49972080

Chinese Academy of Sciences and the National Natural Science Foundation of China 40172074

  • Received Date: 14 Jan 2004
  • Accepted Date: 08 Feb 2004
  • There are two models of ultrahigh pressure metamorphism (UHPM) zone in Dabie: the model of under thrusting returning which even arrives at the mantle and the superimposed model of tectonics in the crust. There are two points of view in the argument about formation depth of ultrahigh pressure metamorphism: (1) the depth can be calculated by hydrostatic equation; (2) the high pressure was composed of gravity, tectonic and other forces instead of merely gravity force. Some misunderstandings of mechanical conceptions presented in the paper showing the hydrostatic viewpoints should be open to question. The main conceptions are: (1) the confining pressure was only formed by gravity, and the differential stress was only formed by tectonic force; (2) the differential stress is not big enough to lead to form ultrahigh pressure metamorphism; (3) once tectonic overpressure goes beyond the limited strength of rocks the tectonic force would disappear and the rocks would be broken or rheomorphied at the same time. A short discussion in basic mechanics is made in this paper for a perfect process for discussing the argument.

     

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  • Lü, G. X., Chen, J., Li, X. B., 1998. The Formation Depth of Coesite-Bearning Eclogite, Dabie UHPM Zone, China, Modified by Tectono-Original Additional Hydrostatic Pressure. Chinese Science Bulletin, 43(24): 2590- 2602(in Chinese)
    Wang, Q. C., Liu, J. B., Cong, B. L., 1999. Can the Tectonic Overpressure Lead to Form UHPM? Chinese Science Bulletin, 44(21): 2346- 2350(in Chinese) doi: 10.1007/BF02885943
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