北黄海及其围域地区北北西和北东东向断裂的岩组学

北黄海位于辽东半岛,山东半岛与朝鲜之间,海域及周围地区广泛发育了北东东向和北北西向断裂,据物探资料,它们控制了中、新生代盆地的成生与发展。我们通过部分同方向断裂的岩组学研究,将岩组动力学分析的观点引进岩组图的解释,获得了几点新认识: (1)显微统计测量得到的信息与宏观构造分析有机地结合起来,是对一个地区进行变形史分析的有效研究方法。 (2)以石英在变形过程中仅能以菱面或锥面为主要滑动面为基础,分析北黄海围域断裂的岩组图形,得出了与宏观一致的结论。 (3)北黄海及周围地区的北东东向和北北西向断裂,在第三纪末改变了一次动力学性质,是起因于太平洋板块运动方向的变更。

THE PETROFABRIC STUDY OF NEE AND NNW TRENDING FAULTS IN NORTH YELLOW SEA AND ITS ENVIRONS

The North Yellow Sea lies among the Liaodong Peninsula, Shandong Peninsula and Korea. NEE and NNW trending faults, controlling the formation and development of Mesozoic and Cenozoic basins according to the geophysical prospecting data, are well developed in North Yellow Sea and its around region. Through the petrofabric study of some same trend faults, we have attained some new ideas by introducing the dynamical fabric analysis into the interpretation of the fabric diagrammes.(1) It is an effective method of analizing the deformation history of a region to combine the information attained from the microscopic statistical measurements with the analysis of the macroscopic structures. (2) Regarding that the rhombic faces or pyramidal faces are the chief slide planes in quartz deformation, we have come to the conclusion coinciding with macroscopic analyses by analizing the fabric diagrammes of faults around North Yellow Sea.(3) The late Tertiary dynamic property change of NEE and NNW trending faults developed in North Yellow Sea and its surrounding region is caused by the motion direction change of the Pacific plate.