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Geodynamic Significance of Tectonic Evolution & Medium Property of Sundaland
Pages: 323-331
Year: Issue:  3
Journal: Journal of Seismological Research

Keyword:  Sundalandrelative stable blockancient continental corelateral extrusionclockwise rotation;
Abstract: Based on the plentiful survey and study results about geodynamic evolution,contemporary crustal movement observation,inversion of crust and upper mantle structure in Tibet Plateau,Sichuan,Yunnan,Myanmar and Indochina areas,combined with our wild geological survey and knowledge in Thailand and Vietnam in recent years,and for the purpose to establish a geo-tectonic frame that controlling the regional crust movement and deformation,we propose the conceptions of "active block"and"relative stable block".Our comprehensive analysis demonstrates that Sundaland may play a similar role to the Tarim block,Alashan block and Yangtze block that has the properties of "relative stable block"in the aspects of tectonic evolution,medium characteristics and the contemporary movement and deformation,and it is all these relative stable blocks that constitute the rigid constraint boundary regulating the clockwise rotation of the material extruded from Tibet Plateau laterally.Meanwhile,the point implies that the sphere of influence of lateral extrusion dynamic action by Tibet Plateau may cover the wide region including Sichuan,Yunnan,Myanmar and Northern Indochina,which will be helpful for furthering and improving our understanding about the geodynamic environment of strong earthquake.
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