吉林延边缝合带的性质与东北亚构造

Nature of the Yanbian suture zone and structure of Northeast Asia

根据近年的新进展,讨论了延边缝合带的性质,认为它是晚侏罗世兴凯地块与龙岗-冠帽地块联合的增生缝合带,属于东北亚中生代环太平洋构造带的一部分。中国东北与整个东北亚一样,中生代构造主要形成于晚侏罗世—早白垩世,其内带是大陆(包括大陆边缘)碎块的增生,外带主要是具有特提斯洋特征的洋壳和岛弧碎块的增生。

Based on recent advances in geological work, this paper discusses the nature of the Yanbian suture zone. The authors think that this suture zone is an accretionary suture zone of the combined Late Jurassic Khanka block and Longgang-Guanmao block, belonging to the Northeast Asian Mesozoic circum-Pacific tectonic belt. As is the case with the whole of Northeast Asia, Mesozoic structure of Northeast China mainly formed in the Late Jurassic to Early Cretaceous. It composed of two belts: the inner belt resulted from accretion of fragments of continental crust(including the continental margin), and the outer belt mainly formed by accretion of island arc and oceanic crustal fragments with the characteristics of the Tethys Ocean.