起潮力作为地球演化的一种动力的探讨

A DISCUSSION ON THE TIDAL FORCE AS ONE DYNAMIC FORCE OF EARTH EVOLUTION

摘要:

讨论了潮汐弹性位能的量级和转化及内波形成的机制.认为当地球是一个非完全弹性体(耗散体)时,在周期潮汐应力作用下,地球莫霍面上弹性位能的耗散可达300μW/m³的产热量,大大超过了花岗岩中放射性物质3μW/m³的产热量.在地球内部密度有差异的化学界面上(如莫霍面),当其两侧有物质进入弹塑性状态成为马克斯威尔体时,在界面起伏部位的倾斜面上,水平面上的潮汐剪切应力在倾斜面上的分力,使两侧的物质作反向流动,扩大了界面的起伏,形成内波.本文还用重力分异的观点讨论了莫霍面是一个化学界面的问题.

Abstract:

In this paper,the magnitude and transformation of tidal elastic potential energy and the formation mechanism of internal wave are discussed. In fact,the earth is a non-perfectly elastic body (dissipative body),under action of periodic tidal stress,the dissipation of elastic potential energy on Moho surface will amount to 300 μW/m³ and exceed the output of heat quantity of radioactive matter in granite by a big margin.The chemical boundary surface in the earth such as Moho surface is a density discontinuity one.When some matter on both sides of the boundary is in elasticoplastic state and becomes Maxwell body,alternating loading and unloading shear stress in positive and opposite directions on the rising and falling boundary will be rectified to become one-way loading and unloading shear stress.It will make the matter on both sides directional and reverse movements each other along the boundary surface,forming internal wave.In the course the dissipated tidal elastic potential energy will be transformed into gravitational energy. By using the viewpoint of gravitational divergence,that Moho surface is a chemical boundary surface is discussed.