Joint inversion of surface waves and teleseismic body waves across the Tibetan collision zone: the fate of subducted Indian lithosphere
文献类型：期刊论文
| 作者 | Nunn, Ceri1; Roecker, Steven W.2; Priestley, Keith F.1; Liang, Xiaofeng3; Gilligan, Amy1 |
| 刊名 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 出版日期 | 2014-09-01 |
| 卷号 | 198期号:3页码:1526-1542 |
| 关键词 | Tomography Mantle processes Body waves Surface waves and free oscillations Seismic tomography Continental margins: convergent Asia |
| ISSN号 | 0956-540X |
| DOI | 10.1093/gji/ggu193 |
| 文献子类 | Article |
| 英文摘要 | We carry out a joint inversion of surface wave dispersion curves and teleseismic shear wave arrival times across the Tibetan collision zone, from just south of the Himalaya to the Qaidam Basin at the northeastern margin of the plateau, and from the surface to 600 km depth. The surface wave data consist of Rayleigh-wave group dispersion curves, mainly in the period range from 10 to 70 s, with a maximum of 2877 source-receiver pairs. The body wave data consist of more than 8000 S-wave arrival times recorded from 356 telesesmic events. The tomographic images show a 'wedge' of fast seismic velocities beneath central Tibet that starts underneath the Himalaya and reaches as far as the Bangong-Nujiang Suture (BNS). In our preferred interpretation, in central Tibet the Indian lithosphere underthrusts the plateau to approximately the BNS, and then subducts steeply. Further east, Indian lithosphere appears to be subducting at an angle of similar to 45A degrees. We see fast seismic velocities under much of the plateau, as far as the BNS in central Tibet, and as far as the Xiangshuihe-Xiaojiang Fault in the east. At 150 km depth, the fast region is broken by an area similar to 300 km wide that stretches from the northern edge of central Tibet southeastwards as far as the Himalaya. We suggest that this gap, which has been observed previously by other investigators, represents the northernmost edge of the Indian lithosphere, and is a consequence of the steepening of the subduction zone from central to eastern Tibet. This also implies that the fast velocities in the northeast have a different origin, and are likely to be caused by lithospheric thickening or small-scale subduction of Asian lithosphere. Slow velocities observed to the south of the Qaidam suggest that the basin is not subducting. Finally, we interpret fast velocities below 400 km as subducted material from an earlier stage of the collision that has stalled in the transition zone. Its position to the south of the present subduction is likely to be due to the relative motion of India to the northeast. |
| WOS关键词 | UPPER-MANTLE BENEATH ; VELOCITY STRUCTURE ; CRUSTAL STRUCTURE ; SOUTHERN TIBET ; SHEAR-VELOCITY ; NORTHERN TIBET ; TRAVEL-TIMES ; SEISMIC TOMOGRAPHY ; UPPERMOST MANTLE ; LACHLAN OROGEN |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000339955900020 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | Natural Environment Research Council, AWE Blacknest(NE/H52449X/1) ; Natural Environment Research Council, AWE Blacknest(NE/H52449X/1) ; Natural Environment Research Council, AWE Blacknest(NE/H52449X/1) ; Natural Environment Research Council, AWE Blacknest(NE/H52449X/1) ; Natural Environment Research Council, AWE Blacknest(NE/H52449X/1) ; Natural Environment Research Council, AWE Blacknest(NE/H52449X/1) ; Natural Environment Research Council, AWE Blacknest(NE/H52449X/1) ; Natural Environment Research Council, AWE Blacknest(NE/H52449X/1) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/85305]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Nunn, Ceri |
| 作者单位 | 1.Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England 2.Rensselaer Polytech Inst, Dept Earth & Environm Sci, Troy, NY USA 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Nunn, Ceri,Roecker, Steven W.,Priestley, Keith F.,et al. Joint inversion of surface waves and teleseismic body waves across the Tibetan collision zone: the fate of subducted Indian lithosphere[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2014,198(3):1526-1542. |
| APA | Nunn, Ceri,Roecker, Steven W.,Priestley, Keith F.,Liang, Xiaofeng,&Gilligan, Amy.(2014).Joint inversion of surface waves and teleseismic body waves across the Tibetan collision zone: the fate of subducted Indian lithosphere.GEOPHYSICAL JOURNAL INTERNATIONAL,198(3),1526-1542. |
| MLA | Nunn, Ceri,et al."Joint inversion of surface waves and teleseismic body waves across the Tibetan collision zone: the fate of subducted Indian lithosphere".GEOPHYSICAL JOURNAL INTERNATIONAL 198.3(2014):1526-1542. |
入库方式： OAI收割
来源：地质与地球物理研究所
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