首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Deep geodynamics of far field intercontinental back-arc extension: Formation of Cenozoic volcanoes in northeastern China
Authors:Shi Yao-lin  and Zhang Jian
Institution:(1) Laboratory of Computational Geodynamics, Graduate School of Chinese Academy of Sciences, 100039 Beijing, China
Abstract:There are three cases of variation of trench location possible to occur during subduction: trench fixed, trench advancing, and trench retreating. Retreat of trench may lead to back-arc extension. The Pacific plate subducts at low angle beneath the Eurasia plate, tomographic results indicate that the subducted Pacific slab does not penetrate the 670 km discontinuity, instead, it is lying flat above the interface. The flattening occurred about 28 Ma ago. Geodynamic computation suggests: when the frontier of the subducted slab reaches the phase boundary of lower and upper mantle, it may be hindered and turn flat lying above the boundary, facilitates the retreat of trench and back-arc extension. Volcanism in northeastern China is likely a product of such retreat of subduction, far field back-arc extension, and melting due to reduce of pressure while mantle upwelling. Foundation item: National Natural Science Foundation of China (40234042 and 40174027).
Keywords:back-arc basin  Cenozoic volcano  geodynamics  northeastem China
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号