Two-Directional Plate Convergence along the East Margin of Eurasia and its Influence on the Continent
详细信息
- 责任者：Jiang Hui (Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Gao Xianglin
- 刊名：Chinese Journal of Geophysics
- 出版年：2012
- 卷期：55(3)
- 关键词：板块聚敛 ; plate convergence ; 板块俯冲 ; subduction ; 欧亚板块 ; Eurasian Plate
- 页码：p.897-905
- 图表：4 illus., 29 refs.
- 分类号：0300
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
Since 3 Ma,the Pacific and Philippine Sea plates moved towards NWW at a greater rate along east margin of Eurasia and subduct at the oceanic trench.At the same time,the Eurasian plate moves to SEE at a smaller rate,thus forming a two-direction plate convergence pattern.The oceanic slab plunges beneath the Eurasian continent at a small dip on the east side of Japan island-arc,causing compressive deformation in the shallow subsurface that extends to east edge of the Japan Sea.In the central and northern Ryukyu arc,the subducting Philippine Sea slabs dip west at a relatively big angle,while the southwest section of this arc is experiencing active trench retreat and back-arc spread.Taiwan is a locus where three kinds of plate convergence coexist： the Eurasian subducts east along the Manila trench,the Luzon arc collides with Taiwan producing east-west compression and young mountain building of the Taiwan crust,and the Philippine plate underthrusts toward north below the Eurasian along the southwest Ryukyu trench.The Philippine islands is a broad transitional zone of deformation where the Eurasian plate subducts to east and the Philippine Sea plate underthrusts to west on either side of the islands.Overall,the deformation generated by the Pacific and Philippine Sea plate motions seems to concentrate in the slab interiors and island arcs proper,not extending to the back-arc regions and farther west to the Eurasian continent.Probably the horizontal stress component produced by these subducting plates is relatively small so that it cannot stop the slow eastward motion of the Eurasian continent and poses no considerable influence on the present-day intracontinental tectonics of Eurasia.