柳河盆地中生代充填特征与盆地演化

摘要

柳河盆地中生代地层发育有中侏罗统侯家屯组,下白垩统果松组、鹰嘴砬子组、林子头组、下桦皮甸子组和亨通山组.主要岩石类型为碎屑岩、火山碎屑沉积岩、火山碎屑岩和熔岩,沉积相为扇三角洲--湖泊相.根据岩性变化和岩相组合,将下白垩统划分为13个三级层序和8种充填类型.根据盆地构造和层序特征,划分为5个构造发育阶段,分别是中侏罗世初始凹陷阶段、晚侏罗世抬升剥蚀阶段和早白垩世的3个火山喷发--沉降阶段.柳河盆地是一个受走滑张扭--走滑压扭机制控制的走滑伸展盆地.%Mesozoic strata of Liuhe Basin include Middle Jurassic Houjiatun Formation,Early Cretaceous Gu-osong-,Yingzuilazi-,Linzitou-,Xiahuapidianzi-and Hengtongshan formations.There exist four types of rocks in-cluding clastic rocks,pyroclastic sedimentary rocks,pyroclastic rocks and lava rocks,and the sedimentary facies is fan delta-lacustrine.Based on lithology and association of lithofacies, the Lower Cretaceous filling succession has been divided into 13 third-order sequences and 8 filling types.Based on the basin tectonics and sequence charac-teristics,the evolution of Liuhe Basin has been divided into 5 tectonic stages,i.e.the initial sagging stage of Mid-dle Jurassic,the uplift and denudation stage of Late Jurassic and volcanic eruption-subsidence stages of Early Creta-ceous.Liuhe Basin is a strike-slip basin controlled by tenso-shear and compresso-shear mechanism.