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一、江苏南部地质背景 苏南位于中国东部新华夏系第二隆起带,秦岭东西构造带的南支东段在本区北部复合的地带。在燕山期区内北东向及东西向构造明显得到加强,还生成了北北东向构造形迹。在上述构造发育过程中,还伴生了北西西向(290°—300°)及北北西向(340°—350°)的断裂构造形迹。喜山期,特别是晚第三纪以来,沿活动性较强的断裂带内有玄武岩喷发。苏南西部多位
I. Geological Background of Southern Jiangsu Province Sunan is located in the second uplifted belt of the Xinhuaxia System in eastern China. The eastern section of the Qinling-West structural belt is in the compound zone of the northern part of the area. In the Yanshanian period, the NE-trending and east-west tectonics have been obviously strengthened, and a north-north-trending tectonic trace has also been formed. During the above tectonic development, faults along the NWW (290 ° -300 °) and north-NWW (340 ° -350 °) are also associated. Since the Himalayan period, especially since the late Tertiary period, basalt eruption occurred along the highly active fault zone. Many in southern Jiangsu