摘要
笔者对地球内部压力分析提出了楔状体压力模式,即地球内部某深度单位面积(水平)上的压力(垂向)等于由该截面和所有经由该截面边缘的重力线所围限的楔状岩体的重量。据此模式,理论上地球内部压力随深度呈抛物线状急增,在地心处无穷大。但由于地球固液(塑)圈层交替存在及冷收缩,导致楔状岩体重力引起的作用力可分解成水平的侧向压力和垂向静岩压力,并随深度呈锯齿状升降变化。当岩石圈侧向压力增加导致岩石圈破裂(构成板块),在重力的向心力作用下,板块间相互错动形成俯冲带和拉张带,继而牵引软流圈构成远程对流运动,进而引发一系列地质构造作用。因此认为,地球的构造动力源于地球重力本身,其中侧向压力是地质构造的初始起动力和驱动力,引起的对流运动既是地质构造运动学表征又是动力学作用,重力势能及其转变的热能构成对流运动的最主要动力能源。
Wedge pressure pattern for the study of stress in earth interior is presented by author, the vertical pressure on horizontal unit area at certain depth in earth interior equal to the weight of wedge rock bodies being defined by the cross section and all gravity lines passed through its section fringe. Theoretically, the inner pressure of global rapidly increased as parabolic shape with increasing depth, and infinite at global core. But the process by gravity of wedge rock bodies may be divided into horizontal lateral pressure and vertical lithostatic pressure due to alternate presence and contract when cooled of global solid and liquid sphere layers, and take shape of up - and - down change with depths. Increase of lateral pressure generate break - up of lithosphere （composed plate） by process of centripetal force of gravity, mutual movement between plates form subduction zone and extensional zone, successively drag soft flow sphere consisting of long - distance convection movement, and more give result to a series of geologic structural process. Therefore, structural force is considered deriving from the global gravity itself, its lateral pressure is initiate force and drive force of geologic structure, convection - induced movement is of either characterization of structural kinematics or kinematics function, gravity potential energy and its transformed heat energy make the foremost dynamic energy of convection movement.
出处
《贵州地质》
2007年第1期78-84,共7页
Guizhou Geology
关键词
地球圈层结构
楔状体压力模式
构造动力
structure of global spheres
wedge pressure model
structural force
