【作者】 魏鑫；

【导师】 王勇生；

【作者基本信息】 合肥工业大学 ， 构造地质学， 2010， 硕士

【摘要】 目前,对华北克拉通破坏的机制、过程与动力作用方式等方面的认识非常有限,华北克拉通破坏机制是一个当前讨论最激烈的问题。为了获得华北克拉通破坏的机制,本文通过对华北克拉通东部郯庐断裂带中段及周边的胶莱盆地、鲁西南地区以及合肥盆地等地区进行详细的野外观察,同时对上述地区进行古应力场数据采集,获得了216组逆冲断层和走滑断层的数据,室内工作通过利用法国巴黎南方大学研制的计算机程序反演了研究区内自早白垩世到新近纪的古应力场的演化过程,得出华北克拉通东部自早白垩世以来存在脉动式挤压活动。根据古应力场测量结果,本文认为在该地区早白垩世为NWW向挤压,晚白垩世为EW向挤压和NE向挤压,古近纪为NNW向挤压、SN向挤压、NNE向挤压,新近纪为NW向挤压。通过把应力场分期数据与太平洋板块的运动方向的变化相结合,综合分析得出结论,认为华北克拉通东部的破坏机制及动力来源是太平洋板块向欧亚板块下俯冲所产生的。更多还原

【Abstract】 Now, few about the mechanism, process as well as dynamical mode during destruction of the North China Craton (NCC) are obtained and the destruction mechanism of the NCC is one of controversial problems and is still not solved. In order to obtain the destruction mechanism of the NCC, we present detailed structural analysis of the middle segment of Tan-Lu Fault and its adjacent Jiaolai Basin, western Shandong Province and Hefei Basin and collect compressional stress data from all these areas. In this work, we obtain 216 groups data of thrust fault and strike-slip fault in these areas. We utilize the computer program that programmed by the Southern Paris University to inverse the evolution of the compressional stress from the Early Cretaceous to the Neocene. Therefore, a conclusion can be drawn that there are pulsant compressional action happening since the Early Cretaceous. The direction of the compressional stress is NWW in the Early Cretaceous, EW in the late Cretaceous, NNE, S-N and NNW in the Paleocene and NW in the Neocene. Combining with the moving direction of the Pacific plate, we suggest that destruction of the NCC is mostly caused by the subduction of the Pacific plate beneath the Euro-Asia plate.更多还原