徐家围子断陷沙河子组沉积末期基底快速隆升地质事件

GEOLOGICAL EVENT OF THE RAPID UPLIFTED BASEMENT AT LATE K1SH IN XUJIAWEIZI RIFT DEPRESSION

松辽盆地北部徐家围子断陷在伸展裂陷过程中，于沙河子组（K1sh）末期至营城组（Kyc）沉积时期发生挤压构造反转，受这次构造运动的影响，断陷的中、北部在沙河子组末期有一次基底的快速隆升地质事件。通过地震解释剖面、平衡剖面、古构造演化图及基底变质核杂岩等分析，初步论证了此次地质事件的存在及其特点，并对其形成的动力学背景和地质意义进行了探讨。

Compressional structure reversion happened at the sedimentary period from Late Shahezi Formation （ K1sh） to Yingcheng Formation （ K1 yc ） in the extending course of Xujiaweizi Rift Depression in North Songliao Basin. Influenced by the tectonic movement, a geological event of the rapid uplift basement occurred at Late Shahezi Formation in the center and north of the depression. By means of the analyses of seismic interpretation profiles, equilibrium profiles, palaeostructural evolution map, the metamorphosed complex of the basement and so forth, the existence and characteristics of the geological event are initially demonstrated and furthermore the dynamics background and the geological significance of the event formation are discussed.