洋脊中轴裂谷地形的动力学描述

洋脊中轴裂谷是板块的创生边界,是与地球内部联系最紧密的地表区域之一。多年来一直吸引着地球科学家们的注意。但是,对于中轴裂谷的成因,至今没有得到圆满的解释。本文利用文献1]所提出的上涌流动模式,利用电子计算机进行了数值计算,得出了裂谷深度和宽度。其结果均与观测数据符合得较好,从而给出了洋脊中轴裂谷地形成因的一个动力学解释。

DYNAMICAL DESCRIPTION OF THE TOPOGRAPHY OF RIFT VALLEY OVER AXIAL PART OF THE OCEANIC RIDGE

The rift valley over the axial part of an oceanic ridge is the accreting plate boundary. It is one of the most important surface regions which associates closely with the interior of the earth. It has attracted the attention of earth scientists for many years, but the cause of formation of the rift valley over the axial part of an oceanic ridge, has not yet been well explained. In the present paper, by adopting a model of upwelling flow introduced in literature 1], the topographic profile of the rift valley is obtained. Calculation of the depth and width of the rift valley gives results which agree well with observations.