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| 1 | The formation depth of coesite-bearing eclogite,Dabie UHPM zone,China,modified by tectono-original additional hydrostatic pressure显示文摘The knowledge that hydrostatic pressure is equal to the gravity value of the overlying rocks in studying a dynamic state of certain underground site is argued. It is suggested that the stress field T in the crust is a combination or superposition of total hydrostatic pressure P with differential stress σ,and the total hydrostatic pressure P at any point in the crust comprises two parts: one is spherical stress tensor PG caused by the gravity, and the other is spherical stress tensor Ps caused by tectonic stress; therefore P could not be attributed to the gravity of overlying rocks only. The results obtained by a finite-element simulation indicate that the tectono-original additional hydrostatic pressures Ps decrease gradually from the compressive zone (pcS) to the shear zone (PSHs)and to the tensile zone (PTs), i.e.Pcs>PsHs>PTs in the same depth. On the basis of the above-mentioned research, the method of measurement and calculation of metallogenetic depth corrected by Ps is | LU Guxian, CHEN Jing, LIU Ruixun and LI Xiaobo Institute of Geomechanics , Beijing 100081, China Electron Microscopy Laboratory, Peking University, Beijing 100871, China Department of Geology, Peking University, Beijing 100871, China Institute of Geological Information , Beijing 100037, China | 1999 | Chinese Science Bulletin1999，44，5： | 10 |
| 2 | Discussion on measurement and calculation principle of petrogenetic depth显示文摘Geologic and geophysical data certificate that lithosphere and its down rock behave as solid, therefore,it is better to measure petrogenetic and metallogenetic depth according to internal stress of solid states. Lithomechanic experiment found that the bigger the confining pressure, the bigger the tensile and shear strength of rocks,so rock can bear very high differential stress but it is not broken. Sibson put forward that the property of rocks under 10-15km of the surface changes from brittle to ductile (rather than from elastic to plastic). Rock with ductile de- | LU Guxian and LIU Ruixun Institute of Geomechanics , Chinese Academy of Geological Sciences , Beijing 100081 , China Department of Geology, Peking University, Beijing 100871, China | 1999 | Chinese Science Bulletin1999，44，24： | 5 |
| 3 | PRESSURE GRADIENT FROM THE CONTRIBUTION OF BOTH GEOTHERMAL AND GRAVITY IN THE LITHOSPHERE显示文摘The pressure gradient of the lithosphere is a key to explaining various geological processes, and varies also in time and space similar to the geothermal gradient. In this paper a correlation formula of geothermal gradients and pressure gradients was built with the thermocomprestion coefficients. Based on this formula, the article has studied the relation between the pressure gradients and the geothermal gradients in the lithosphere, and the results indicate that the pressure gradient in the lithosphere is nonlinear, and its minimum value is the lithostatic gradient, and that the pressure gradient of the lithosphere will increase obviously with the contribution of both geothermal and gravity, and could be twice times more than the lithostatic gradient. | HU Baoqun LU Guxian WANG Fangzhang SUN Zhanxue LIU Chengdong BAI Lihong | 2005 | Geotectonica et Metallogenia2005，29，2： | 1 |
| 4 | Thoughts on the Measurement and Calculation of Geogenetic Depth显示文摘The method of determining the depth of geological events is based on the geobarometer method. According to this method, a depth to a certain position is obtained in such a way that the pressure at that position is divided by the specific weight(density) of the overlying rock formations, called the 'W/SW' method in this paper. This method follows the principle of hydrostatics, assuming that rocks in this case are in a static fluid state(standard state) rather than a solid state. If so, only pressure could be measured from the rocks because the latter does not exist in a | LIU Ruixun LU Guxian | 2000 | Acta Geologica Sinica(English Edition)2000，74，2： | 0 |
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