乌苏里地区构造新探索

通过乌苏里地区中苏合作对比研究，对该区的构造有了以下一些新的认识：若干地体的拼贴奠定了东北亚大陆边缘的构造格局，地体的拼贴在时空上是有规律可寻的，这一规律解释了地槽学说对该区构造解释中的疑难问题。通过那丹哈达－比金地体外来岩块的地层对比，建立了一套完整的层序，在利恢复地体漂泊的历史。通过对比还发现苏联远东溪海地区和中国延吉地区可能同是不凯地体二叠纪的活动大陆边缘，三叠纪也经历了共同的演化历史。

A NEW APPROACH TO THE TECTONICS IN THE USSURI(WUSULI)REGION

The Ussuri region, comprising both sides of the Wusuli River, i. e. the Nadanhada Range on the Chinese side, Sikhote-- Alin on the Soviet side and the Khan-ka (Xingkai) block situated astraddle the Sino--Soviet border, has long been aninteresting subject in the study of the geology of Asia. The study on the geologyof the region involves the reconstruction of the accretionary history of the East-Asian continental margin and the evolution of the Western Pacific Ocean. Theapplication of the terrane concept may help solve some problems that cannot besolved with the geosynclinal concept.Through a cooperative study of the tectonicevolution of this region in light of the terrane concept the Chinese and Sovietgeologists have made the following progress. (1) The Primorye region of the Far-East U. S. S. R. and the peri--pacificregion of Northeast China were formed by the collage of several allochthnous ter-ranes including the Bureja Jiamusi, Nadanhada--Bikin, Central Sikhote--Alin, Te-tyukhe and Khanka. The identification and range of the Khanka terrane are dis-cussed in this paper, and the Yanji region and the Primorye region are inferredto be the Permian active continental margin of the Khanka terrane. (2) A complete stratigraphic sequence of the Nadanhada Bikin terrane hasbeen established through a comparative study, and the time of collage of the ter-ranes is beleived to be Late Jurassic.