Asymmetric flank uplift of the Yinchuan graben, north central China: Implications for lateral variation of crustal rheology from the Alashan to the Ordos
文献类型：期刊论文
| 作者 | He, JK; Li, YX; Teng, CK |
| 刊名 | GEOPHYSICAL RESEARCH LETTERS
 |
| 出版日期 | 2005-12-01 |
| 卷号 | 32期号:23 |
| ISSN号 | 0094-8276 |
| DOI | 10.1029/2005GL023661 |
| 文献子类 | Article |
| 英文摘要 | The Yinchuan graben in north central China is an intense active zone that is bordered by the Alashan to the west and the Ordos to the east. Analysis of high-resolution digital topography shows that the present elevation on two shoulders of the graben exists drastic contrast (similar to 1.5-2 km). We use two-dimensional finite element modeling to investigate the mechanical relation between crustal rheology and flank uplift of this graben. Models are simplified as an elastoplastic upper crust and a viscoelastic lower crust. Two antithetic faults on the graben's margins are simulated as Coulomb-type frictional zones. Rheological tests show that the asymmetric flank uplift of the graben can be reconciled with lateral variations of crustal rheology; With the lower-crust viscosity of the Ordos being similar to 1-2 orders greater than that of the Alashan, we predict that even with the same effective friction of the two antithetic faults (0.1), the flank uplift will localize mainly on the west shoulder, consistent with present topographic contrast. This means that the crustal strength of the Alashan is weak relative to the Ordos, resulting in the active deformation and the seismicity being occurred heavily within the Alashan. |
| WOS关键词 | DEFORMATION ; RIFT ; EXTENSION ; DYNAMICS ; RANGE ; BASIN ; FAULT ; ASIA ; LITHOSPHERE ; SEISMICITY |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000233935700001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65248]  |
| 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 100029, Peoples R China 2.China Seismol Bur, Crustal Deformat Monitoring Ctr 1, Tianjin 300180, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, JK,Li, YX,Teng, CK. Asymmetric flank uplift of the Yinchuan graben, north central China: Implications for lateral variation of crustal rheology from the Alashan to the Ordos[J]. GEOPHYSICAL RESEARCH LETTERS,2005,32(23). |
| APA | He, JK,Li, YX,&Teng, CK.(2005).Asymmetric flank uplift of the Yinchuan graben, north central China: Implications for lateral variation of crustal rheology from the Alashan to the Ordos.GEOPHYSICAL RESEARCH LETTERS,32(23). |
| MLA | He, JK,et al."Asymmetric flank uplift of the Yinchuan graben, north central China: Implications for lateral variation of crustal rheology from the Alashan to the Ordos".GEOPHYSICAL RESEARCH LETTERS 32.23(2005). |
入库方式： OAI收割
来源：地质与地球物理研究所
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