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一、地质背景 我国东部沿长江中、下游发育着一系列由中生代火山岩组成的盆地。其中自西向东有大冶盆地、怀宁盆地、庐江—枞阳盆地、宁芜盆地、溧水盆地、六合盆地、镇江盆地等。盆地的展布除大冶盆地呈东西向外,其他盆地大致为北东到北北东向。 宁芜盆地是这些火山岩盆地中发育、演化比较典型的一个。这个盆地是以三叠系青龙群石灰岩、黄马青群砂页岩和下中侏罗系象山群砂岩为基底发育而成的继承性盆地。盆地四周以断裂或断裂带为界,形成一个以断陷为主的盆地。
I. Geological Background In the eastern part of China, a series of basins of Mesozoic volcanic rocks are developed along the middle and lower reaches of the Yangtze River. Among them, there are Daye Basin, Huaining Basin, Lujiang-Zongyang Basin, Ningwu Basin, Lishui Basin, Liuhe Basin and Zhenjiang Basin from west to east. In addition to the Daye Basin, the distribution of the basin is east-west outward, and the other basins are generally northeast to north-north east. The Ningwu basin is one of the most developed and evolved in these volcanic basins. The basin is a succession of basins developed from the Triassic Qinglong Group limestone, the Huangmaqing Group sand shale and the Lower Middle Jurassic Xiangshan Group sandstone. The basin is surrounded by faults or fault zones, forming a basin dominated by fault depression.