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本文根据陈国达教授创立的地洼理论,在前人研究成果及其工作实践的基础上,对长白—兴安地区中新生代地壳发展阶段的基本特征,进行了比较全面系统的研究。认为该区自晚三叠世以来,地壳运动在逐渐增加,直到晚侏罗至早白垩世达到最高潮。在这样地壳运动的地质条件,区内广泛形成有拱曲型和块断型的地洼盆地。在这些盆地中沉积了巨厚层的、具有一定陆相复理式韵律的华夏式建造,并夹杂着大量的火山喷发岩建造。这些沉积建造,普遍的沿走向发生较大的变化。地壳运动的主要形式之一,是区域断裂构造活动强烈,而且形成较为发育的深大断裂构造,断褶带分布广泛。在拱曲型和块断型的地洼盆地中,往往形成开阔的短轴褶皱构造。沿着深大断裂带及其附近,普遍有基性,超基性岩侵入,在断褶带内偏碱性花岗岩浆活动强烈。岩浆侵入活动的顺序,为从酸性岩浆向基性、超基性岩浆(或碱性岩浆)方向演化。并形成有丰富的矿产。 笔者认为该区中新生代地壳发展的特点,与下伏基底地槽和地台构造层所代表的发展阶段的特点具有明显区别。因此,应当将它从区内由地台构造层代表的发展阶段划分出来;它是,一个新的阶段——地洼发展阶段。其现阶段的区域大地构造性质,不应当归入地台区,而是属于地洼区。
Based on the theory of Diwa established by Professor Chen Guoda and based on the research results of predecessors and their working practices, this paper makes a comparatively comprehensive and systematic study of the basic characteristics of the Meso-Cenozoic crustal development in the Changbai-Xing’an region. It is believed that the crustal movement gradually increased in the area since the Late Triassic, reaching its peak until the Late Jurassic to Early Cretaceous. In such a crustal movement of the geological conditions, the formation of a wide area of the arch curved and block-type depression in the basin. In these basins, a huge thick layer of Huaxia-type sedimentary facies has been deposited in the basins, mixed with volcanic eruptions. These sedimentary structures, the general changes along the larger changes. One of the main forms of crustal movement is the intense tectonic activity in the area and the formation of more developed deep fault structures with extensive distribution of fold zones. In arched and block faulted geocene basins, open short axis fold structures are often formed. Along the deep fault zone and its vicinity, there are generally basic and ultrabasic intrusions, and the alkaline granite magmatism is strongly active in the fault zone. The order of magmatic intrusion activity is from acidic magma to basic and ultrabasic magmatic (or alkaline magmatic) direction evolution. And formed a wealth of minerals. The author believes that the characteristics of the Mesozoic-Cenozoic crustal development in this area are obviously different from the characteristics of the developmental stages represented by the underlying basement trough and platform tectonic layer. Therefore, it should be divided from the stage of development in the area represented by the platform tectonic layer; it is a new stage - the stage of development of the diwa. The tectonic nature of the area at this stage of the earth should not be classified as a metro area, but rather as a land area.