Mesozoic lithospheric deformation in the North China block: Numerical simulation of evolution from orogenic belt to extensional basin system
文献类型：期刊论文
| 作者 | Wang, YH; Houseman, GA; Lin, G; Guo, F; Wang, YJ; Fan, WM; Chang, X |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2005-08-15 |
| 卷号 | 405期号:1-4页码:47-63 |
| 关键词 | Basin Formation Continental Shortening And Extension Crustal Deformation Geodynamics North China Block Thin Sheet Models Lithospheric Thinning |
| ISSN号 | 0040-1951 |
| DOI | 10.1016/j.tecto.2005.05.012 |
| 文献子类 | Article |
| 英文摘要 | Horizontal extension of a previously thickened crust could be the principal mechanism that caused the development of widespread extensional basins throughout the North China block (Hua-Bei region) during the Mesozoic. We develop here a regional tectonic model for the evolution of the lithosphere in the North China block, based on thin sheet models of lithospheric deformation, with numerical solutions obtained using the finite element method. The tectonic evolution of this region is defined conceptually by two stages in our simplified tectonic model: the first stage is dominated by N-S shortening, and the second by E-W extension. We associate the N-S shortening with the Triassic continental collision between the North and South China blocks, assuming that the Tan-Lu Fault system defines the eastern boundary of the North China block. The late Mesozoic E-W extension that created the Mesozoic basin systems requires a change in the regional stress state that could have been triggered by either or both of the following factors: First, gravitational instability of the lithosphere triggered by crustal convergence might have removed the lower layers of the thickened mantle lithosphere and thus caused a rapid increase in the local gravitational potential energy of the lithosphere. Secondly, a change to the constraining stress on the eastern boundary of the North China block, that might have been caused by roll-back of the subducting Pacific slab, could have reduced the E-W horizontal stress enough to activate extension. Our simulations show that widespread thickening of the North China block by as much as 50% can be explained by the collision with South China in the Triassic and Jurassic. If convergence then ceases, E-W extension can occur in the model if the eastern boundary of the region can move outwards. We find that such extension may occur, restoring crustal thickness of order 30 km within a period of 50 Myr or less, if the depth-averaged constitutive relation of the lithosphere is Newtonian, and if the Argand number (the ratio of buoyancy-derived stress to viscous stress) is greater than about 4. Widespread convective thinning of the lithosphere is not required in order to drive the extension with these parameters. If, however, the lithospheric viscosity is non-Newtonian (with strain-rate proportional to the third power of stress) the extensional phase would not occur in a geologically plausible time unless the Argand number were significantly increased by a lithospheric thinning event that was triggered by crustal thickening ratios as low as 1.5. (c) 2005 Elsevier B.V. All rights reserved. |
| WOS关键词 | RAYLEIGH-TAYLOR INSTABILITY ; PRESSURE CONTINENTAL-CRUST ; FINITE STRAIN CALCULATIONS ; VISCOUS SHEET MODEL ; EAST CENTRAL CHINA ; NONLINEAR VISCOSITY ; TIBETAN PLATEAU ; MANTLE BENEATH ; TAN-LU ; COLLISION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000231303800003 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65336]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 作者单位 | 1.Univ London Imperial Coll Sci Technol & Med, Ctr Reservoir Geophys, London SW7 2BP, England 2.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England 3.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, YH,Houseman, GA,Lin, G,et al. Mesozoic lithospheric deformation in the North China block: Numerical simulation of evolution from orogenic belt to extensional basin system[J]. TECTONOPHYSICS,2005,405(1-4):47-63. |
| APA | Wang, YH.,Houseman, GA.,Lin, G.,Guo, F.,Wang, YJ.,...&Chang, X.(2005).Mesozoic lithospheric deformation in the North China block: Numerical simulation of evolution from orogenic belt to extensional basin system.TECTONOPHYSICS,405(1-4),47-63. |
| MLA | Wang, YH,et al."Mesozoic lithospheric deformation in the North China block: Numerical simulation of evolution from orogenic belt to extensional basin system".TECTONOPHYSICS 405.1-4(2005):47-63. |
入库方式： OAI收割
来源：地质与地球物理研究所
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