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Volume 15 Issue 2
Jun 2004
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Guxian Lü, Ruixun Liu, Fangzheng Wang. Pressure State in Deep Crust and Formation Depth of UHP Metamorphic Rocks. Journal of Earth Science, 2004, 15(2): 135-144.
Citation: Guxian Lü, Ruixun Liu, Fangzheng Wang. Pressure State in Deep Crust and Formation Depth of UHP Metamorphic Rocks. Journal of Earth Science, 2004, 15(2): 135-144.

Pressure State in Deep Crust and Formation Depth of UHP Metamorphic Rocks


the Major Science and Technology Development Program 2002201

the Geologic Survey Subject 200110200104

the Ministry of Land and Resources 

  • Received Date: 14 Jan 2004
  • Accepted Date: 08 Feb 2004
  • This paper presents some questions to the formula of pressure=depth×specific gravity from the viewpoint that the hydrostatic pressure is equal to the gravity of overlying rocks and the rocks in a static fluid state, which is drawn from the research and analysis of the research field and the corresponding problems of the pressure state in the deep crust and the formation depth of the UHP metamorphic rocks. In this research, the underground rocks are considered as the solid possessing some rheological behaviors to discuss the polysource stress state and to obtain a more reasonable method for the calculation of depths using the model of the unbalanced force solid. It is suggested from this paper that the P/SW method for the calculation of the ultrahigh pressure stemming only from the gravity has obviously overstated the formation depth of the UHP metamorphism. The formation model emphasizing the effect of the gravity, the tectonic force and the metamorphic force of the facies change concludes that such UHP minerals as coesite may have been produced in the inner crust.


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