The crust and upper mantle anisotropy in Baikal Rift Zone and its dynamic significance
文献类型：期刊论文
| 作者 | Zhang Jian-Li1,2; Tian Xiao-Bo1; Zhang Hong-Shuang1; Si Shao-Kun1,2; Zhang Zhong-Jie1; Teng Ji-Wen1 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2012-08-01 |
| 卷号 | 55期号:8页码:2523-2538 |
| 关键词 | Seismic anisotropy Baikal Rift SKS splitting Horizontal components misalignment |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/j.issn.0001-5733.2012.08.005 |
| 文献子类 | Article |
| 英文摘要 | The Baikal Rift lies at the southeast edge of Siberian Craton, and is one of the most representative continental rifts. The dynamic mechanism of its formation and evolution has always been the focus of argument. In this study, one improved analysis method of shear-wave splitting is used, which is called 'global minimum transverse energy' (GM), to process the seismic data from long-term-station ULN and TLY, and finally obtain the anisotropy attribute of crust and upper mantle. The SKS measurement at station ULN shows that, there are two anisotropic layers below station ULN: phi(upper) (phi means fast direction) = N74 degrees E, delta t(upper) (delta t means delay time) = 0. 80 s, phi(upper) = N128 degrees E, delta t(lower) = 0. 80 s; while the measurement of phase PmS splitting reveals one anisotropic layer situated in crust: phi(aver) = N77 degrees E, delta t(aver) = 0. 26 s, with the phi value near phi(upper) of the two-layer model, perhaps indicates that the upper layer includes both the crust and mantle lithosphere. On the other hand, the SKS measurement at station TLY shows that, the upper mantle structure displays strong lateral nonuniformity: when BAZ (back azimuth) <90 degrees, phi is close to N60 degrees E, delta t(aver) = 1. 27 s; when BAZ>90 degrees, phi is close to N120 degrees E, delta t(aver) = 1. 40 s. Besides, no effective PmS splitting measurement is obtained, and the arrival times of phase PmS from different azimuths are consistent with each other, both sustain an isotropic crust. After synthetic analysis we arrive at the following conclusions: 1) Below station ULN, the upper layer may be the frozen structure in lithosphere, and crust and mantle lithosphere have undergone conformable deformation, while the lower layer was formed due to the present flowing of asthenosphere mantle; 2) Due to the block of the rigid Siberian Craton, the flow direction of mantle is deflected by the south edge of craton, that is, the deep mantle flows around the edge of craton, which further formed the lateral variation of upper mantle structure below station TLY. |
| WOS关键词 | SEISMIC ANISOTROPY ; SPLITTING BENEATH ; FLOW BENEATH ; SKS ; LITHOSPHERE ; TECTONICS ; MONGOLIA ; REGION ; ASIA ; DEFORMATION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000308571300005 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/84736]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhang Jian-Li |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang Jian-Li,Tian Xiao-Bo,Zhang Hong-Shuang,et al. The crust and upper mantle anisotropy in Baikal Rift Zone and its dynamic significance[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2012,55(8):2523-2538. |
| APA | Zhang Jian-Li,Tian Xiao-Bo,Zhang Hong-Shuang,Si Shao-Kun,Zhang Zhong-Jie,&Teng Ji-Wen.(2012).The crust and upper mantle anisotropy in Baikal Rift Zone and its dynamic significance.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,55(8),2523-2538. |
| MLA | Zhang Jian-Li,et al."The crust and upper mantle anisotropy in Baikal Rift Zone and its dynamic significance".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 55.8(2012):2523-2538. |
入库方式： OAI收割
来源：地质与地球物理研究所
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