地堑谷沿着大陆的一些高而漫长的地带形成,其下伏有一种高温低速地幔。在这样一些区域的岩圈中,出现强大的张应力。来自低速地幔的高热流,大大降低了下部地壳的粘度。在该层中,发生柔性扩张,使其厚度减小。这就产生了上复的上部地壳的断层运动和沉降运动,在地球表面,形成了一种深而漫长的凹陷式裂谷。 Gully valleys are formed along some of the continent’s high and long lands, underlying a high-temperature and low-velocity mantle. In these areas of the rock ring, there is a strong tensile stress. The high heat flow from the low-velocity mantle greatly reduces the viscosity of the lower crust. In this layer, flexible expansion occurs, reducing its thickness. This resulted in the faulting and subsidence of the upper crust in the upper complex, forming a deep, long, concave rift on Earth’s surface.