亚洲东部大陆边缘的构造扩张和地球动力环境  

PLATE TECTONICS AND CONTINENTAL TECTONICS

作　　者：杨森楠[1] 周国藩[1] 

机构地区：[1]中国地质大学,武汉430074

出　　处：《地质科技情报》1992年第1期14-20,共7页Geological Science and Technology Information

基　　金：本项研究得到中科院动力大地测量学开放实验室的资助

摘　　要：东亚大陆边缘位居大陆岩石圈和大洋岩石圈交接地带,是各种地质作用的强烈演变带,也是它们之间的物质交换和能量转变带。在这里我们可以看到大洋岩石圈和大陆岩石圈的差别,也可以看到大陆边缘在构造扩张中陆壳解体、分离和漂移的演变历史,以及在构造收缩中陆壳块体聚合、拼贴和碰撞的发展过程。大陆边缘构造背景的变换,取决干大陆岩石圈板块和大洋岩石圈板块之间构造作用的动平衡,也取决于区域地幔应力场的变化。This issue carries three papers on plate tectonics and continental tectonics. The first paper 'On the Relationship between Plate Tectonics and Continental Tectonics' illustrates the significance of continental tectonics and the application of plate tectonic theory to the study of the characteristics and regularity of continental tectonics. The writer expounds upon the relationship between plate and continental tectonics in terms of temporal and spatial relationship, kinematics and dynamics. From the temporal perspective, the comparison of the present plates with the ancient ones is considered an important ap-proach to identity their relationship. This comparison is achieved by reconstruction of the ancient o-ceans and continents through studies of ophiolite, pair metamorphic belts, mingled accumulation on continent, and terrains. As a result, data of the formation and evolution history of ancient plates are updated. The connection and comparison between marginal and inner plate tectonics as well as the importance of inner plate tectonics are emphasized from a spatial perspective. Kinetic analysis shows that the main types of plate movement are dispersed, convergent and transitional movements of which the first two are most essential. Dispersion may result in basins, rifts, aulacogens, troughs, and oceans. O-ceans are the highest form of dispersion that forms new plates while the others are in the range of inner plate tectonics. Convergence may fold into mountains or lift up to form continents, creating large-scale marginal plate tectonics such as subduction belts, mutual connection belts and sutures which in turn give rise to basins, rifts, slip faults, nappe structures, detachment faults and tectonic-magmatic belts as inner plate tectonics. The dynamic cause of plate movement is believed to be the heat convection in depth which can be classified into full mantle convection, upper mantle convection, bilayer convection and secondary local convection. Recently, several geophysicists have reported

关 键 词：大陆边缘 构造扩张 地球动力学 

分 类 号：P736.15[天文地球—海洋地质]