辽西地区中生代火山-沉积盆地群特征及成因机制

The Characteristics and Mechanism of Mesozoic Volcanic Sedimentary Basin Group of Western Liaoning

辽西地区的早侏罗世—早白垩世盆地群是一类颇具特色的断陷盆地群。盆地构造演化具多期次特点，火山作用与沉积作用频繁交替，形成了兴隆沟、蓝旗和义县三个火山沉积旋回。兴隆沟、蓝旗旋回是在挤压盆地中形成的，是古亚洲构造域向环太平洋构造域转换时期的产物；义县旋回是弧后裂谷盆地的产物。盆地特征及深部构造研究表明。

Early Jurassic to early cretaceous basin group of western Liaoning is a distinguished group of fault basin. It involves tectonic evolution of many times and frequent alternation of volcanism and sedimentation, forming Xinglonggou, Lanqi and Yixian volcanic sedimentary cycle. Xinglonggou and Lanqi cycle are formed during the transition of ancient Asia tectonic field to Round Pacific Ocean tectonic field and Yixian cycle is formed in back arc rift basin. The features of the basin group and deep structure show that the reasons why thermal depression is not developed in the basin group are the character of lithosphere and strong volcanic aetivity.