论板块运动的驱动力

本文从动力学的角度讨论了板块运动的驱动机理,并提出了计算板块扩张速度的公式,然后求出了不同类型板块的扩张速度。用此公式所计算出的板块扩张速度与实际观测速度很符合。

ON THE DRIVING FORCE OF PLATE MOTIONS

The present work with the dynamic consideration, gives a discussion on the driving mechanism of pake movements. At the same time we investigate the velocity of plate movements and advance a formula for calculating the extension velocity, and thus give the spreading rate of different types of plate movements. This formula indicates that the main driving forces of plate movement are caused by the lateral extension associated with the intrusion of magmas at mid-ocean ridges, while the, resistance is offered by the force due to the viscocity of mantle below the plates. Besides, oceanic plate is also acted by driving force originating from descending slabs beneath marginal seas and the viscous resistance on both sides of them.The plate spreading rate evaluated with this formula is pretty close to that of actual survey. Therefore, this will be quite beneficial and significant to investigate the driving mechanism of plate movements.