胶莱盆地白垩纪构造应力场与转换机制

通过对胶莱盆地断层滑动矢量的收集与测量,利用计算机程序反演了盆地白垩纪的古构造应力场演化历史,并据此将盆地的发育划分为三个伸展阶段和三个挤压反转阶段,分别为早白垩世早-中期莱阳期伸展,与造山期后应力松弛重力坍塌有关;早白垩世中-晚期青山期伸展,受早白垩纪早期以后广泛的岩石圈减薄、大陆裂陷制约;晚白垩世王氏期伸展,与郯庐断裂及牟平-即墨断裂右旋走滑有关。三期伸展之间存在构造挤压反转,最后阐明各期盆地发育的地球动力学背景。

EVOLUTION OF THE STRUCUTRAL STRESS FIELD IN JIAOLAI BASIN IN CRETACEOUS

Based on analysis of slip vector data of faults in different formations of the Cretaceous basins, the Cretaceous deformation history of the Jiaolai Basin can be divided into three extensional periods. The first stage, during the earliest Cretaceous, is the formation of Laiyang Group as controlled by gravity collapse; the second stage, in the middle-late of early Cretaceous, is dominated by NW-SE extension-formed Qingshan Formation as characterized by rifting development and widespread silicic-intermediate volcanism; the third stage, during the period of late Cretaceous Wangshi Formation, is dominated by N-S extension due to the dextral strike-slip of the Tanlu fault belt. Corresponding to the extensional activity, Jiaolai basin underwent three episodes of structural reversion, i.e., at the end of Laiyang period, the Qingshan period and the Wangshi period. The research may offer important evidences related to the tectonic evolution of eastern China.