Constraints of 3-d plate geometry on the dynamics of continental deep subduction
文献类型：期刊论文
| 作者 | Li Zhong-Hai; Shi Yao-Lin |
| 刊名 | Chinese journal of geophysics-chinese edition
 |
| 出版日期 | 2016-08-01 |
| 卷号 | 59期号:8页码:2806-2817 |
| 关键词 | Continental subduction Uhp metamorphism Plate geometry Numerical modeling Himalaya Dabie-sulu |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg20160808 |
| 通讯作者 | Li zhong-hai(li.zhonghai@ucas.ac.cn) |
| 英文摘要 | Investigations of continental deep subduction and ultra-high pressure (uhp) metamorphism play significant roles in better understanding the continental geodynamics. thereby, a number of geological and geophysical observations, as well as numerical simulations, have already been conducted systematically. however, along-strike variations are commonly observed in continental subduction/collision zones and mountain belts in nature. these three-dimensional (3-d) characteristics may be strongly dependent on the initial geometry and kinematics of converging continental plates. in order to study this problem, we have conducted 3-d high-resolution numerical models of subduction with rectangular or wedge-shaped continental plates, in which the subducting continental plate is laterally neighbored by oceanic subduction zone. the results demonstrate that oceanic subduction is continuous; however, slab break-off occurs in the continental subduction zone, after which the dip angle of the residue continental slab is decreased. in the model with rectangular continent, slab break-off occurs at around 150 km depth; whereas in the wedge-shaped continental subduction model, the depth of slab break-off is larger at about 250 similar to 300 km. the different phenomena are mainly attributed to the competing effects between the upward negative buoyancy of subducting continental slab and the downward drag from along-strike neighboring oceanic slab. in addition, after slab break-off, no matter in the model with a rectangular or wedge-shaped continent, a narrow continental marginal lithosphere (60 70 km in width) can keep going with the subducting oceanic slab to the mantle. this provides a good explanation for the continental sliver subduction dragged by neighboring oceanic subduction in new zealand. the numerical models are also compared with the himalaya and qinling-dabie-sulu mountain belts, which provide significant implications for the along-strike variation in distributions of hp-uhp metamorphic rocks. |
| WOS关键词 | FLUID-MELT ACTIVITY ; NEW-ZEALAND ; OCEANIC SUBDUCTION ; CRUSTAL STRUCTURE ; HIMALAYAN OROGEN ; SOUTH ISLAND ; COLLISION ; EXHUMATION ; METAMORPHISM ; LITHOSPHERE |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000381166400008 |
| 出版者 | SCIENCE PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2374443 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Li Zhong-Hai |
| 作者单位 | Univ Chinese Acad Sci, Coll Earth Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li Zhong-Hai,Shi Yao-Lin. Constraints of 3-d plate geometry on the dynamics of continental deep subduction[J]. Chinese journal of geophysics-chinese edition,2016,59(8):2806-2817. |
| APA | Li Zhong-Hai,&Shi Yao-Lin.(2016).Constraints of 3-d plate geometry on the dynamics of continental deep subduction.Chinese journal of geophysics-chinese edition,59(8),2806-2817. |
| MLA | Li Zhong-Hai,et al."Constraints of 3-d plate geometry on the dynamics of continental deep subduction".Chinese journal of geophysics-chinese edition 59.8(2016):2806-2817. |
入库方式： iSwitch采集
来源：中国科学院大学
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。