论文部分内容阅读
如何深入了解中国东部北黄海盆地东部坳陷岩浆活动特征是目前研究的前沿之一.为探讨早白垩世异常剧烈岩浆活动的区域构造成因并揭示中国东部的构造动力学机制,利用井-震及岩浆岩测试资料,对北黄海盆地岩浆活动特征及其与区域构造的耦合关系进行研究.在空间上刻画了岩浆的侵入相、喷出相的地震反射特征及沿深大断裂展布的平面分布特征;在时间上划分出了包括早白垩世108~115Ma、134~145Ma在内的4期岩浆活动.结合区域地质分析认为早白垩世早期,伊泽奈琦板块沿北北西斜向俯冲于欧亚板块之下,太平洋板块向南西方向俯冲,板块剪切作用导致郯庐断裂带左旋走滑,使得盆地处于左旋伸展环境中,内部形成派生的北西向右旋、近南北向左旋的次级共轭断裂系并控制岩浆上侵底辟活动.经过综合分析,厘清了盆地岩浆活动及断裂演化过程与区域板块运动之间的耦合关系.
It is one of the frontiers to study how to understand the magmatic activity in the eastern part of the northern North China Sea in the eastern part of the Yellow Sea.In order to explore the regional tectonic causes of the abnormal Early Cretaceous magmatic activity and to reveal the tectonic dynamics in eastern China, Magmatic rock test data to study the magmatic activity and its coupling relationship with the regional tectonics in the North Yellow Sea Basin, and describe the magmatic intrusive facies, the seismic reflection characteristics of the jet facies and the plane distribution along the deep faults Characteristics of the magmatic activity in the Early Cretaceous.According to the regional geological analysis, the Early Cretaceous, the Isenaiqi plate diagonally subducted north to northwest in the Early Cretaceous, and divided into four magmatic activities including the Early Cretaceous 108 ~ 115Ma, 134 ~ 145Ma. Under the subplate, the Pacific plate subducted southwestward and the plate shear resulted in left-lateral strike-slip of the Tanlu fault zone, causing the basin to be in a left-lateral extensional environment with a derived north-west to right-handed and near north-south to left-handed secondary Yoke fault system and control of the diapir activity on the magmatism.According to the comprehensive analysis, it is clarified that between the magmatic activity and the evolution of the fault and the regional plate movement Coupling relationship.