|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Structure and composition of the continental crust in East China显示文摘Crustal structures of nine broad tectonic units in China, except the Tarim craton, are derived from 18 seismic refraction profiles including 12 geoscience transects. Abundances of 63 major, trace and rare earth elements in the upper crust in East China are estimated. The estimates are based on sampling of 11 451 individual rock samples over an area of 950 000 km^2, from which 905 large composite samples are prepared and analyzed by 13 methods. The middle, lower and total crust compositions of East China are also estimated from studies of exposed crustal cross sections and granulite xenoliths and by correlation of seismic data with lithologies. All the tectonic units except the Tarim craton and the Qinling orogen show a four-layered crustal structure, consisting of the upper, middle, upper lower, and lowermost crusts. P-wave velocities of the bulk lower crust and total crust are 6.8—7.0 and 6.4—6.5 km/s, respectively. They are slower by 0.2—0.4 km/s than the global averages. The bulk lower crust is | 高山 骆庭川 张本仁 张宏飞 韩吟文 赵志丹 KERN Hartmut | 1999 | Science China Earth Sciences1999，42，2： | 11 |
| 2 | Poisson's ratio of eclogite: Implications for lower crustal delamination of orogens显示文摘Laboratory measurements of combined P- and S-wave-velocities of eclogite from the Dabie-Sulu ultrahigh pressure metamorphic belt and from literature data show a significant increase of Poisson抯 ratio of eclogite with its intrinsic water content H2O+ and thus the degree of hydration. Unaltered eclogites with H2O+<1.0% have an average Poisson抯 ratio between 0.24 and 0.25, which is identical to that calculated from single crystal elastic properties but lower than the averages (0.270.02) of measurements compiled by previous studies. Thus, the Poisson抯 ratio of unaltered eclogites is considerably lower than that of lower crustal mafic granulite and upper mantle peridotite. The lower crust and upper mantle of the Dabie ultrahigh pressure metamorphic belt, the northern and southern parts of the Tibetan Plateau as well as the central Andes, where eclogite may have formed during Mesozoic and Cenozoic tectonism, are characterized by the Poisson抯 ratio >0.26. This, together with their normal upper mantle P-wave velocities, implies that eclogites are no longer an important component of the present-day lower crust and upper mantle of these subduction-collision belts. Combined with age constraints on eclogite-facies metamor- phism and subsequent exhumation, this in turn suggests that the interval from formation to delamination of eclogites is confined to a very short period of <15 Ma. | 高山 Hartmut Kern 金振民 张宏飞 张本仁 | 2003 | Science China Earth Sciences2003，46，9： | 4 |
| 3 | Development of damage and permeability in deforming rock salt显示文摘 | SCHULZE OTTO POPP TILL KERN HARTMUT | 2001 | Engineering Geology2001，61，： | 1 |
| 4 | Elastic and Seismic Properties of Dabie-Sulu Ultrahigh Pressure Metamorphic Rocks显示文摘Lamé modulus(λ) and shear modulus(μ) are among the most important,intrinsic,elastic constants of rocks.Using λ and μ could be much more advantageous than using P-and S-wave velocities(Vp and Vs).Here we quantified these equivalent isotropic elastic moduli for 115 representative rocks from the ultrahigh pressure(UHP) metamorphic terrane of the Dabie-Sulu orogenic belt(China) and their variations with pressure(P),temperature(T),density(ρ),Vp,Vs and mineralogical composition.Both moduli increase nonlinearly and linearly with increasing pressure at low(<200-300 MPa) and high(>200-300 MPa) pressures,respectively.In the regime of high pressures,λ and μ decrease quasi-linearly with increasing temperature with temperature derivatives dλ/dT and dμ/dT generally in the range of -10×10-3 to -1×10-3 GPa/oC.Dehydration of water-bearing minerals such as serpentine in peridotites and chlorite in retrograde eclogites results in an abrupt drop in λ while μ remains almost unchanged.In λ-ρ,μ-ρ and λ-μ plots,the main categories of UHP rocks can be characterized.Serpentinization leads to significant decreases in μ and λ as serpentine has extremely low values of λ,μ and ρ.Eclogites,common mafic rocks(mafic gneiss,metagabbro and amphibolite),and felsic rocks(orthogneiss and paragneiss) have high,moderate and low μ and λ values,respectively.For pyroxenes and olivines,λ increases but μ decreases with increasing Fe/Mg ratios.For plagioclase feldspars,both λ and μ exhibit a significant positive correlation with anorthite content.SiO2-rich felsic rocks and quartzites are deviated remarkably from the general trend lines of the acid-intermediate-mafic rocks in Vs-ρ,μ-ρ,λ-Vp,λ-Vs and μ-λ diagrams because quartz has extremely low λ(~8.1 GPa) and ρ(2.65 g/cm3) but moderate μ(44.4 GPa) values.Increasing the contents of garnet,rutile,ilmenite and magnetite results in a significant increase in the λ and μ values of the UHP metamorphic rocks.However,either λ or μ is insensitive to the compositional variations for pyralspite(pyrope-almandine-spessartine) solution series.The results provide potentially improved constraints on characterization of crustal composition based on the elastic properties of rocks and in situ seismic data from deep continental roots. | WANG Qian JI Shaocheng SUN Shengsi Matthew H.SALISBURY Hartmut KERN | 2012 | Acta Geologica Sinica(English Edition)2012，86，1： | 1 |
| 5 | Development of damage and permeability in deforming rock salt显示文摘 | Otto Schulze Till Popp Hartmut Kern | 2001 | Engineering Geology2001，，2： | 1 |
| 6 | Development of damage and permeability in deforming rock salt显示文摘 | Otto Schulze Till Popp Hartmut Kern | 2001 | Engineering Geology2001，61，23： | 1 |
| 7 | Development of damage and permeability in deforming rock salt显示文摘 | Otto Schulze Till Popp Hartmut Kern | 2001 | Engineering Geology2001，，2： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员