吉林中部早古生代弧后盆地地质特征

The geological features of the early Paleozoic backarc basin the central part of Jilin Province

在吉林中部地区，从伊通放牛沟岛弧与华北大陆板块之间，发育一套早古生代火山—沉积岩系，为同一沉积盆地内不同沉积环境下的岩石组合。通过岩石建造分析、岩石化学及区域构造等方面分析，表明该沉积盆地的构造环境为一未完全封闭的弧后盆地，在早古生代华北板块北缘东端构成非标准的弧—盆构造体系，形成特有的活动大陆边缘。通过沉积岩系形成时代对比，认为该弧后盆地属残留成因，并提出盆地的构造演化模式。

In the central part of Jilin province, between the Yitong,Fangniugou island arc and the North China continental plate, there is a set of the early Paleozoic developed volcano-sedimentary rock series,belonging to a rock association in the same sedimentary basin but different sedimentary environments. Through the analysis of petrographic formation, lithochemistry and areal structures, it is showed that the structural setting of the sedimenary basin is an uncomplete enclosed back-arc basin, and a nonstandard arc-basin structural system on the end of east of the northern margin of north China plate in the early Paleozoic era was formed, resulted in formation of the unique active continental margins. Through the formation time correlation of the sedimentary rock series, we hold that the back-arc basin belongs to residual origin, and proposed an evolutional model of the basinal structure.