中国东南部,在九岭山脉以南,雪峰山脉以东的广大地区的大地构造,中外地质学家曾经多次予以论证。他们绝大多数人,都认为这里是一个前震旦纪的地台地带。新出版的“中国大地构造纲要(中国及邻国边境大地构造图说明书)”的作者,将该区当作华南台块的一部分,并作为中国地台活化的典型地区之一。最近陈国达似乎主要依据对这一地区大地构造的研究,提出了“地壳第三基本构造单元——地洼区”的理论。 In the southeastern part of China, the geotectonics of the vast areas to the south of the Jiuling Mountains and to the east of the Xuefeng Mountains have been demonstrated by Chinese and foreign geologists on many occasions. Most of them think they are a Pre-Sinian platform. The newly published author, “The Outline of China’s Tertiary Structure (Description of Tectonic Map of the Earth’s Continent at the Border of China and Neighboring Countries”), considered the area as part of the South China Platform and serves as one of the typical areas for the activation of terraces in China. Recently, Chen Guodao seems to mainly rely on the study of the tectonics in this area and put forward the theory of “the third basic tectonic unit of the crust - the depression.”