辽西北票盆地侏罗系充填序列及对区域构造演化的指示

CHARACTERISTICS OF THE JURASSIC FILLING SEQUENCE AND THE INDICATION OF TECTONIC EVOLUTION OF BEIPIAO BASIN, WESTERN LIAONING

陆相盆地地层充填序列主要受控于构造作用、古气候和沉积物的供给速度 ,而构造的控制作用尤为重要 ,根据北票盆地的演化特点 ,充分考虑火山作用的影响 ,界定了 3个级别火山—沉积旋回的涵义 ,并将北票盆地侏罗系充填序列划分为 2个一级旋回 ,5个二级旋回及若干个三级旋回。盆地的地层充填序列特征是对构造演化的良好指示剂 ,各级火山—沉积旋回的交替反映了构造演化的阶段性。北票盆地在侏罗纪整体处于挤压构造背景之下 ,中间又包含有多次挤压—伸展—挤压的构造演化过程。

The filling sequence of continental basin is mainly controlled by tectonic, palaeoclimate and the supplying speed of sediments. The tectonic is the most dominate factor. According to the features of the Beipiao Basin and effect of volcanism, three types of cycle are put forward and the Jurassic sequence is divided into 2 GradeⅠ,5 GradeⅡ,and several GradeⅢ. The filling sequence of basin is a very good indication of the tectonic evolution .The alternation of cycle displays the stages of tectonic evolution and the Beipiao Basin is controlled by squeezing setting, and experienced many times of squeezing stretching squeezing processes.