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笔者根据野外考察和测龄数据等发现,茅山及其邻区玄武岩有两次喷发旋回,形成早第三纪玄武岩和晚第三纪玄武岩.前者分布在茅东断裂带及其以东地区;后者分布在南京—溧阳断裂带上.两带交汇于竹箦王市和上沛老虎山,这两点恰好位于含幔源(橄榄岩)包体的橄榄玄武岩的所在地.它的存在不仅受特殊深部构造条件控制,而且后期构造变形明显.表明茅东断裂带与南京—溧阳断裂带已垂直延伸到上地幔,并且新三纪以后仍有活动.最后笔者从溧阳两次地震机制节面要素,震源体和余震分布与玄武岩分布图象关系等,推测含幔源橄榄岩包体的玄武岩可能是溧阳地震孕育和发生不可忽视的因素之一.
According to field investigation and age-measuring data, the author found that Maoshan and its adjacent basalts erupted twice and formed Early Tertiary basalts and late-Tertiary basalts. The former is located in the Mao-Dong fault zone and the east of the area. Located in the Nanjing-Liyang fault zone, where the two belts meet at Wangdalp and Shangri-La Tiger Hill, both of which are located just below the olivine basalts containing mantle-derived (peridotite) inclusions, Deep tectonic conditions and obvious structural deformation in the later period, indicating that the Mao-Dong fault zone and the Nanjing-Liyang fault zone have vertically extended to the upper mantle and are still active after the Neogene.Finally, from two elements of the Seismic Mechanism Festival in Liyang, It is speculated that the basalts containing mantle-derived peridotite inclusions may be one of the factors that can not be ignored in the occurrence and occurrence of the Liyang earthquake.