Lower-crust ductile flow and its dynamical relation with syn-collision crustal extension in orogenic belt
文献类型：期刊论文
| 作者 | He, JK; Liu, JZ |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2002-07-01 |
| 卷号 | 45期号:4页码:483-496 |
| ISSN号 | 0001-5733 |
| 关键词 | syn-collision extension orogenic belt lower crust ductile flow numerical modeling |
| 文献子类 | Article |
| 英文摘要 | In attempt to reveal the dynamical relation between lower crust ductile flow and upper crust extension in collisional orogen, a numerical simulation is carried out using Finite Element Method ( FEM), based on the stress-strain constitution of incompressible Non-Newtonian viscoelastic rheology. Results indicate that, owing to tectonic compression and topographical loading in mountain-building process, the crust will undergo complex ductile flow. Patterns of flow are time-dependent, and are influenced mainly by the shape of crust transition zone ( CTZ) between mountain belt and foreland. Under the mechanic balance of tectonic compression and gravitational loading, the ductile flow is first facilitated in lower crust of mountain root. After several times of Maxwell time, it will be restricted narrowly beneath the CTZ, where the ductile flow is featured by the down flow near the mountain side and the up flow near the foreland side. This flow pattern causes the differential displacement in diverse tectonic layers and finally results in the stress partition in the upper crust of orogen, namely, the minimum principle stress near the center of orogen is transformed from horizontal compression to horizontal tensile. In details, this tensile stress is mainly formed after time of the several Maxwell times, and the magnitude of tensile stress is closely related with the height of mountain range above reference level. It can be inferred from this model result that the crust exension in collisional orogen has the dynamical relation with gravitational collapse, while the collapse is further intensified by the lower crust lateral flow. For this reason, it is concluded that the compression-extension coupling in mountain belt is mainly derived from the lower crust ductile flow, which in initiated by the topographical loading the collisional compression. Using this model, the mechanics of crustal extension in southern Qinghai-Xizang plateau has been illustrated. |
| WOS关键词 | INDO-ASIAN COLLISION ; CONTINENTAL LITHOSPHERE ; GRAVITATIONAL COLLAPSE ; EASTERN TIBET ; DEFORMATION ; FIELD ; MODEL ; FAULT |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | SCIENCE CHINA PRESS |
| WOS记录号 | WOS:000177189900006 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/77313]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | He, JK |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China 2.Beijing Univ, Dept Geophys, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, JK,Liu, JZ. Lower-crust ductile flow and its dynamical relation with syn-collision crustal extension in orogenic belt[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2002,45(4):483-496. |
| APA | He, JK,&Liu, JZ.(2002).Lower-crust ductile flow and its dynamical relation with syn-collision crustal extension in orogenic belt.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,45(4),483-496. |
| MLA | He, JK,et al."Lower-crust ductile flow and its dynamical relation with syn-collision crustal extension in orogenic belt".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 45.4(2002):483-496. |
入库方式： OAI收割
来源：地质与地球物理研究所
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