MECHANISMS OF CONTINENTAL RIFTOGENESIS

Abstract

Artyushkov, E.V., 1981. Mechanisms of continental riftogenesis. In: J.H. Illies (Editor), Mechanism of Graben Formation. Tectonophysics, 73: 9–14. Rift valleys are formed along high and strongly elongated uplifts on the continents, which are underlain by a low-velocity mantle of high temperature. Tensile stresses of high magnitude appear in the lithosphere of such regions. High heat flow from the low-velocity mantle strongly decreases the viscosity of the lower crust. Ductile extension arises in this layer, reducing its thickness. This results in faulting and subsidence of the overlying upper crust, producing a deep elongated depression or rift valley on the earth's surface.