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

Mechanical Nature of Gravity and Tectonic Forces

  • Received Date: 16 Jul 2018
  • Rev Recd Date: 16 Jul 2018
  • Publish Date: 16 Jul 2018
  • 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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