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本文利用卫星、地面重力测量资料确定的球谐函数系数和地幔流体力学方程计算了南海及其围区不同模式的地幔流应力场。这些不同模式在不同程度上显示了不同规模的板块构造及板内构造特点。低阶及全阶场反映了大规模板块运动规律及碰撞边界,并为东亚边缘海是由于大陆边缘断裂解体、地幔向洋一侧蠕散的陆缘扩张观点提供了依据。高阶及中阶场则说明了陆缘地堑系的地幔流应力场特征与地质构造特点符合较好,并为边缘海尤其是南海的形成规律提供了新的基础资料。
In this paper, the mantle flow stress fields in different modes of the South China Sea and its surrounding area are calculated by using the spherical harmonic coefficients and the mantle fluid mechanics equations determined by satellite and ground gravimetry data. To varying degrees, these different modes show plate tectonics and in-board structural features of different sizes. The low-order and the full-order fields reflect large-scale plate motion and collision boundaries and provide a basis for the East Asian fringe sea due to the disintegration of the continental margin and the marginal expansion of the mantle to the oceanic side. The high-order and medium-order fields show that the mantle flow stress field in the marginal graben line is in good agreement with the geological structure and provides new basic data for the formation of the marginal sea, especially the South China Sea.