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本文利用地球陆壳和洋壳的简单模型,分析地壳均衡的一般表达式,并讨论区内地震活动,推覆体构造以及金属矿产分布等,与深部地壳结构的对应关系. 一观测表明,大地水准面的形状与大陆和海洋无关,而且与旋转椭球形状的偏差很小,约小于椭率的千分之几或更小.由此说明,深部的质量补偿了表面形状对大地水准面的影响.根据板块学说,地壳和地幔的最上部分,可分为少数几块薄的、刚性的球面顶盖或板块(岩石圈),覆于上
In this paper, we use the simple model of the continental crust and oceanic crust to analyze the general expressions of crustal equilibria and discuss the corresponding relationship between the crustal structure and the seismic activity, the structure of nappe and the distribution of metallic minerals in the area.One observation shows that the geoid Surface shape has nothing to do with the mainland and the ocean, and the deviation from the shape of the spheroid is very small, about less than a few thousandths of ellipticity or less.Thus, the quality of the deep compensation of the surface shape on the geoid According to the plate theory, the uppermost part of the crust and mantle can be divided into a few thin, rigid spherical caps or plates (lithosphere) overlying