地壳运动的原动力The Motive Power of Crustal Movement
地壳运动, 张力, 挤压力, 重力, 形变力Crustal Movement, Tension, Extrusion Force, Gravity, Deformation Force
《Advances in Geosciences》, Vol.6 No.3, 2016-06-20
From the viewpoint of the earth formation and the evolution of the earth, this paper analyzes the movement of the earth’s crust, and puts forward four kinds of the original power, tension, pressure, gravity and deformation force. The tension comes from the volume increase of mantle. The factor increasing the volume of mantle is the state change of solid materials in the earth; the extrusion force comes from the reduced volume of the mantle. The factor reducing the volume of the mantle is the emission of the earth’s interior liquid substances. The form of substance emission includes oceanic crust overhead, volcanic eruption, magma intrusion, air exhaust, hot liquid penetration, etc.; the gravity comes from the change of the earth’s crust. The factors changing the mass of the earth’s crust and floating state include denudation, deposition, fold, fault, volcanic deposit, underplating, subduction, etc. The deformation force is derived from the change of the temperature of the earth’s crust. The main factor that changes the temperature of the crust is the bottom. The state change of substances leads to the increased volume of the mantle, and the emission of substances leads to the reduced volume materials, which is hereinafter referred to as the volume change of the earth. The tension and extrusion force produced by the volume change of the earth is the main power of the crustal movement. The gravity and deformation force produced by the change of mass and temperature of the earth’s crust is the secondary power of crustal movement. The significance of the study of the dynamic of the crustal movement is to explain the various geological structures in the correct way. The tension mainly produces the expansion of oceanic crust; the extrusion force produces subduction of oceanic crust, transform fault, plate drift, fold of continental crust, shear fault, overthrust fault and other structural phenomenon; the gravity is the factor which determines the crust rise or fall; the deformation force produces back-arc basin, island arc, extensional fault of continental crust, exhumation of continental crust and other structural phenomenon.