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一、区域地质概述 江苏西南部位于江南隆起和淮阳隆起两个前震旦纪古老地块之间的下扬子地区,是一个在扬子基底上,自震旦纪至三迭纪长期拉张性坳陷带,属于黄汲清教授等人所称的扬子准地台下扬子褶皱带。本区西部和北部以长江断裂为界,东部以珥陵—旧县断裂为界,南部以三山街—宣城断裂为界,包括宁芜、溧水、句容、宁镇及茅山山脉等地,大致呈一正菱形,面积近一万平方公里(图1)。
I. Overview of Regional Geology Jiangsu Province is located in the lower Yangtze area between the two pre-Sinian ancient blocks in the Jiangnan uplift and the Huaiyang uplift in the southwestern part of Jiangsu Province. It is a long-standing stretch on the Yangtze basement from the Sinian to Triassic Belt, belonged to Professor Huang Jiqing and others called Yangtze sub-platform Yangtze fold belt. The area is bounded by the Yangtze River fault in the west and the north of the district, the Er’er-Laoxian fault in the east and the Sanshan-Xuancheng fault in the south, including Ningwu, Lishui, Jurong, Ningzhen and Maoshan ranges, Roughly a positive diamond, an area of nearly 10,000 square kilometers (Figure 1).