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| 1 | Late Caledonian Ductile Thrusting Deformation in the Central East Kunlun Belt, Qinghai, China and Its Significance: Evidence from Geochronology显示文摘A high-angle ductile thrusting deformation with top-to-the-north movement penetratively developed in the Proterozoic-Early Paleozoic metamorphic rocks along the Central East Kunlun beR. The deformed rocks suffered epidote-amphibolite facies metamorphism. On the basis of our previous study, we present more data in this paper to further support that the ductile thrust deformation occurred in the later Caledonian and more detailed information about the deformation.A zircon U-Pb concordant age of 446±2.2 Ma of a deformed granodiorite in the ductile thrust zone was obtained and can be interpreted as the lower limit of the deformation. A syntectonically crystallized and also strongly deformed hornblende Ar/Ar dating gives an Ar/Ar plateau age of 426.5±3.8 Ma, which represents the deformation age. A strongly orientated muscovite gives an Ar/Ar plateau age of 408±1.6Ma, representing the cooling age after the peak temperature, constraining the upper limit of the ductile thrust deformation. This ductile thrust deformation can be interpreted as the result of the closing of the Central East Kunlun archipelago ocean. To the north, At/At plateau ages of 382.9±0.2 Ma and 386.8±0.8 Ma of muscovite in the deformed Xiaomiao Group represent the uplift cooling ages of deeper rocks after the thrusting movement. The original thrusting foliation has a low angle. A rotation model was put forward to explain the development of the foliation from the original low-angle to present high-angle dipping. | WANG Guocan, CHEN Nengsong, ZHU Yunhai and ZHANG Kexin Faculty of Earth Sciences, China University of Geosciences, Wuhan, Hubei 430074 E-mail: wgcan@cug.edu.cn Ren Xifei, Liu Ruixun and Xie Guanglian | 2003 | Acta Geologica Sinica(English Edition)2003，77，3： | 18 |
| 2 | 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 |
| 3 | 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 |
| 4 | The influence oftectonic deformation on some geochemical properties ofcoals-A possible indicator ofoutburst potential显示文摘 | CAO Yunxing DAVIS A LIU Ruixun | 2003 | InternationalJournal of Coal Geology2003，53，2： | 1 |
| 5 | 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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