地窪区是由地台区活化轉变而成的、地壳的第三基本構造單元。它的主要特征之一,是具有无論比地槽区或地台区都较复杂的結構,表現出较高级的形式;它除继承了它的前身即地台区的褶皺基底和沉积盖层作为自己的第一、二主要構造层外,还在它们上面增添了具有独特性質的第三个主要構造层(图1)。作为一个活动区,它在产生这个“第三構造层”的同时,还表現出强烈的構造运动和岩漿作用。 Diwa area is formed by the activation of the platform area, the third basic tectonic unit of the crust. One of its main features is that it has a more advanced form, both in terms of structure more complex than the trough area or platform area. In addition to inheriting its predecessor, that is, the fold base and sedimentary cover of the platform area As its own first and second major structural layers, it also added a third major structural layer with unique properties (Figure 1). As an activity area, it also shows strong tectonic movement and magmatic effect while producing this “third tectonic layer”.