Three-dimensional rheological structure of the lithosphere in the Ordos   block and its adjacent area

doi:10.1111/j.1365-246X.2005.02745.x

CORC > 北京大学 > 地球与空间科学学院

	Three-dimensional rheological structure of the lithosphere in the Ordos block and its adjacent area
	Zang, SX ; Wei, RQ ; Liu, YG
刊名	geophysical journal international
	2005
关键词	geodynamics lithosphere rheological deformation mechanism rheology structure NORTH CHINA HEAT-FLOW CRUSTAL DEFORMATION CONTINENTAL AREA ACTIVE BLOCKS STRENGTH MANTLE ROCKS EARTHQUAKES MOVEMENT
DOI	10.1111/j.1365-246X.2005.02745.x
英文摘要	The 3-D rheological structure of the lithosphere in the Ordos block and its adjacent area (32 degrees-43 degrees N, 102 degrees-116 degrees E) is obtained using iterative and averaging methods, based on the seismic velocity structure, thermal structure and composition of the lithosphere. The thermal structure is obtained from the newly published surface heat flow data sets. The brittle fracture mechanism is taken into account when the rheological structure is calculated. The strain rate obtained from GPS observation in the area under study is used to calculate the strength and the viscosity of the lithosphere. The results show that there are low-viscosity layers at the bottom of the upper crust, the lower crust and the bottom of the lithosphere both under the Ordos block and its adjacent regions, and the viscosity varies horizontally. The viscosity in grabens surrounding the Ordos block is one to two orders of magnitude lower than that in the Ordos block. The results also show that the rheological structure coincides with the major geological structure, below the major fault systems the viscosity is relatively low. The earthquakes with Ms >= 4.0 occurred along the large active faults. Most of the hypocentres of the earthquakes are in the upper and middle crust with high viscosity. The maximum depth of the earthquake is above the viscosity contour line of 10(22) Pa s. Numerical studies show that the active geological structures must be taken into account when the 3-D rheological structure is used for geodynamics study.; Geochemistry & Geophysics; SCI(E); 0; ARTICLE; 1; 339-356; 163
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311391]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zang, SX,Wei, RQ,Liu, YG. Three-dimensional rheological structure of the lithosphere in the Ordos block and its adjacent area[J]. geophysical journal international,2005.
APA	Zang, SX,Wei, RQ,&Liu, YG.(2005).Three-dimensional rheological structure of the lithosphere in the Ordos block and its adjacent area.geophysical journal international.
MLA	Zang, SX,et al."Three-dimensional rheological structure of the lithosphere in the Ordos block and its adjacent area".geophysical journal international (2005).