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笔者对苏南东部及上海地区的北西向断层作了系统的野外观察,并对断裂带内构造岩作了详细地研究;对北西向断层的力学性质、构造地质特征及地质意义作了初步探讨。现介绍如下,如有不当,敬请指正。一、北西向断层的野外观察 (一)太湖大东岛,石炭系灰岩中发育了三条北西向压性断裂(图1、2),间隔40～50m。其中断层A走向北30°西,倾向北东,倾角75°;断裂带宽度为7m。断层B走向北35°西,倾向南西,倾角70°;断裂带宽度为8m。断裂C走向北35°西,断面近直立;断裂
The author made a systematic field observation of the northwesterly faults in eastern Jiangsu and Shanghai and made a detailed study on the tectonic rocks in the fault zone. The mechanics, tectonic features and geologic significance of the northwesterly faults were discussed. Are introduced below, if improper, please correct me. First, the Northwest fault field observation (A) Taihu Dadong Island, Carboniferous limestone developed three NW compression fractures (Figure 1,2), the interval of 40 ~ 50m. Including the fault A to the north 30 ° west, north-easterly dip angle of 75 °; fracture width of 7m. Fault B to the north 35 ° west, southwest tilt, dip 70 °; fault width of 8m. Fault C to the north 35 ° west, section nearly upright; fracture