Deep geodynamics of far field interconti- nental back-arc extension: Formation of Cenozoic volcanoes in northeastern China

SHI; Yao-lin(石耀霖); ZHANG; Jian(张健)

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Deep geodynamics of far field interconti- nental back-arc extension: Formation of Cenozoic volcanoes in northeastern China

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There are three cases of variation of trench location possible to occur during subduction: trench fixed, trench ad- vancing, 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. Geo- dynamic 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.

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《地震学报：英文版》 |2004年第z1期|1-8|共8页
作者
SHI; Yao-lin(石耀霖); ZHANG; Jian(张健);
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作者单位

Laboratory of Computational Geodynamics;

Graduate School of Chinese Academy of Sciences;

Beijing 100039;

China Laboratory of Computational Geodynamics;

Graduate School of Chinese Academy of Sciences;

Beijing 100039;

China;

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原文格式 PDF
正文语种 chi
中图分类地球动力学与大地构造理论;
关键词
back-arc; basin; Cenozoic; volcano; geodynamics; northeastem; China;

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Deep geodynamics of far field interconti- nental back-arc extension: Formation of Cenozoic volcanoes in northeastern China

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