Lithospheric 3-D flexural modelling of subducted oceanic plate with variable effective elastic thickness along the Manila Trench
文献类型：期刊论文
| 作者 | Sun, Zhen; Zhang, Jiangyang1; Xu, Min; Yang, Hongfeng2; Zhang, Yunfan; Li, Fucheng |
| 刊名 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 出版日期 | 2018 |
| 卷号 | 215期号:3页码:2071 |
| 关键词 | Elasticity and anelasticity Lithospheric flexure Mechanics, theory, and modelling Subduction zone processes |
| ISSN号 | 0956-540X |
| DOI | 10.1093/gji/ggy393 |
| 英文摘要 | Flexural rigidity, indicated by the effective elastic thickness, is important for describing the mechanical behaviour of the subducted oceanic lithosphere in the thin plate model. 2-D thin plate models have been widely used in estimating the effective elastic thickness (T-e) of the oceanic lithosphere at subduction zones and collision zones. However, realistic lithospheric flexural modelling of the subducted oceanic plates should account for the lateral variation of T-e along the strike of the trench. We present a 3-D finite-difference flexural bending model that includes variable flexural parameters in all directions. We compare the results with 2-D flexural models, and we discuss the differences in estimating T-e within the bending plate at subduction zones. Theoretical analysis shows that when T-e changes only slightly along the trench, a 2-D model can sufficiently estimate T-e, when T-e changes sharply because of the effects of seamount loading and bending near the trench, tearing of the subducting plate, or the transition from subduction zone to collision zone; the T-e values calculated by 2-D models may produce errors up to 30 per cent compared with those predicted using a 3-D model, because they fail to account for the lateral slab-pulling force. We evaluate the differences between using 2-D and 3-D flexural model assumptions by simulating bending of the subducted oceanic plate at the northern Manila Trench. The results show that from the subduction zone to the collision zone, T-e estimated from the 2-D model gradually changes from 20.2 to 32.9 km, whereas T-e estimated from the 3-D model changes sharply at the continent-oceanic transition zone of the northern margin of the South China Sea. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/17988]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Univ Hong Kong, Fac Sci, Earth Syst Sci Programme, Shatin, Hong Kong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Zhen,Zhang, Jiangyang,Xu, Min,et al. Lithospheric 3-D flexural modelling of subducted oceanic plate with variable effective elastic thickness along the Manila Trench[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2018,215(3):2071, 2092. |
| APA | Sun, Zhen,Zhang, Jiangyang,Xu, Min,Yang, Hongfeng,Zhang, Yunfan,&Li, Fucheng.(2018).Lithospheric 3-D flexural modelling of subducted oceanic plate with variable effective elastic thickness along the Manila Trench.GEOPHYSICAL JOURNAL INTERNATIONAL,215(3),2071. |
| MLA | Sun, Zhen,et al."Lithospheric 3-D flexural modelling of subducted oceanic plate with variable effective elastic thickness along the Manila Trench".GEOPHYSICAL JOURNAL INTERNATIONAL 215.3(2018):2071. |
入库方式： OAI收割
来源：南海海洋研究所
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