东营凹陷八面河北部斜坡带构造特征及形成机制

Structure Characteristics and Formation Mechanism of Northern Slope of Bamianhe Area in Dongying Depression

摘要:

研究了东营凹陷八面河北部斜坡带的断裂特征、构造演化特征及其形成机制，明确了该区的断裂展布特点和断层活动性，弄清了北部斜坡带的演化规律，同时分析该区的构造变形特征。结果表明：中生代以后，八面河地区存在2种独立的构造变形系统：一是板块边缘相互作用力；二是到后期由于板块的持续俯冲，地幔底辟作用在岩石圈底面产生的牵引力。八面河北部地区在这2种构造力的综合作用下，不同时期表现出不同的构造变形特征。

Abstract:

Fractural characteristics, structural evolution characteristics and the formation mechanism of northern slope of Bamianhe area in Dongying depression have been studied. Fault distribution characteristics, activity and the evolution of northern slope in this area have been clearly illustrated. Furthermore, the structural deformation characteristic has been analyzed as well. It is showed that there were two independent systems of tectonic deformation existed in Bamianhe area after the Mesozoic era. One is interaction force in the edge of the plate, the other is the traction force which was generated in the mantle diapir applying on the bottom of the lithosphere because of continuous plate subduction. Therefore, the north of the Bamianhe area showed different characteristics of structural deformation in different periods with the combination of the two tectonic forces.