Effects of Crustal Eclogitization on Plate Subduction/Collision Dynamics: Implications for India-Asia Collision

查看全文 作　　者：Pengpeng [1,2,3]Huangfu;Yuejun [3,4]Wang;Zhonghai [2]Li;Weiming [4]Fan;Yan [3]Zhang

机构地区：[1]State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences;[2]Key Laboratory of Computational Geodynamics, College of Earth Sciences, University of Chinese Academy of Sciences;[3]School of Earth Science and Geological Engineering, Sun Yat-Sen University;[4]CAS Center for Excellence in Tibetan Plateau Earth Sciences, Key Laboratory of Continental Collision and Plateau Uplift,Institute of Tibetan Plateau Research, Chinese Academy of Sciences

出　　处：《Journal of Earth Science》索引2016年第27卷第5期,共13页

基　　金：financial supports by the National Natural Science Foundation of China(Nos.41490613,41190073 and 41304071);the National Basic Research Program of China(Nos.2014CB440901 and 2015CB856106) 摘　　要：2D thermo-mechanical models are constructed to investigate the effects of oceanic and continental crustal eclogitization on plate dynamics at three successive stages of oceanic subduction, slab breakoff, and continental subduction. Crustal eclogitization directly increases the average slab density and accordingly the slab pull force, which makes the slab subduct deeply and steeply. Numerical results demonstrate that the duration time from initial continental collision to slab breakoff largely depends on the slab pull force. Specifically, eclogitization of subducted crust can greatly decrease the duration time, but increase the breakoff depth. The detachment of oceanic slab from the pro-continental lithosphere is accompanied with obvious exhumation of the subducted continental crust and a sharp uplift of the collision zone in response to the disappearance of downward drag force and the induced asthenospheric upwelling, especially under the condition of no or incomplete crustal eclogitization. During continental subduction, the slab dip angle is strongly correlated with eclogitization of subducted continental lower crust, which regulates the slab buoyancy nature. Our model results can provide several important implications for the Himalayan-Tibetan collision zone. For example, it is possible that the lateral variations in the degree of eclogitization of the subducted Indian crust might to some extent contribute to the lateral variations of subduction angle along the Himalayan orogenic belt. Moreover, the accumulation of highly radiogenic sediments and upper continental crustal materials at the active margin in combination with the strong shear heating due to continuous continental subduction together cause rising of isotherms in the accretionary wedge, which facilitate the development of crustal partial melting and metamorphism. 关键词：碰撞动力学板块俯冲大陆地壳印度喜马拉雅造山带大陆下地壳亚洲热力模型

相关文献

参考文献（63）
引证文献（2）
耦合文献（356）

参考文献(63)

引证文献(2)

耦合文献(356)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Effects of Crustal Eclogitization on Plate Subduction/Collision Dynamics: Implications for India-Asia Collision

参考文献(63)

引证文献(2)

耦合文献(356)

用户提示