郯庐断裂南延问题的地球物理研究

Geophysical Research on the Extension of Tancheng-Lujiang Fault

郯庐断裂是否向南延伸过长江?这是一个颇著争论的问题。本文依据合肥以南广大地区 (24°～32°N,111°～119°E)的地球物理(主要是重力、航磁)资料及其处理结果,探讨了郯庐断裂南延问题。研究表明,郯庐断裂带(狭义的)向南延伸不过长江,止于宿松、广济一带;长江以南地区的断裂构造仅仅是受其影响而已。笔者认为,长江断裂带可能对郯庐断裂的南延有阻挡、限制作用。

According to the geophysical data (mainly gravity and aeromagnetics) from a vast southern part of Hefei city (24°-32°N, 111°-19°E), the extension of Tanchang-Lujiang fault has been approached. Research results show that the T-L fault extends to the area between Susong and Guangji. The fault structures in southern area of the Yangzhi River reflect the influence of T-L fault. The author considers that the Yangzhi fault might have the function of restricting the extension of T-L fault.