华北活动地块区南缘阜南-霍邱地区地壳活动习性初探
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摘要
阜南-霍邱地区地处华北和华南活动地块区边缘构造带,通过对其进行地震地质调查和综合分析研究,发现晚更新世以来该区存在强度较弱的构造变形现象,即:小震沿着主要断裂呈线性条带状分布;研究区南部及断裂近侧的上更新统中发育共轭剪节理;1970年代,研究区固始、霍邱和阜南等地陆续发生过长度不一、宽窄不等、方向不同的地裂缝,展布与肥中断裂或王老人集断裂近乎一致。本文认为,研究区局部小震丛集、上更新统中赋存共轭剪节理、裂面充填物显微揉皱变形和现代地裂缝的生成等现象,反映出地壳能量被缓慢释放和相应断裂发生微弱活动;研究区曾发生过一次破坏性地震(江口集MS4地震)。综上所述,研究区地壳晚第四纪以来具有微弱活动性,且主要表现为蠕滑活动方式。
By means of seismic geological survey and synthesis analyze research in the Funan-Huoqiu area to locate bordering tectonic belt between the North China and South China active block areas, the authors discovered that there were relative feebleness tectonic deformation phenomena in this area since the Late Pleistocene, such as, some small earthquakes distribute linearly along the main fault, there were conjugate joints developed in Late Pleistocene near the fault and in the southern area, the fissures of different lengths, widths and directions occurred in succession in the northern Gushi,the Huoqiu and Funan area in the 1970's, the fissures were consistent approximately with the Feizhong fault or Wanglaorenji fault. The authors considered that the small earthquakes were crowded in the local area, the conjugate joints developed in the Late Pleistocene, the microscopic kneaded deformation occurred in the filling material of the joints and the fissures occurred in the area in the 1970's reflected that the energy of the earth's crust was released slowly and the correspondence faults moved about weakly. There was only one destructive earthquake (Jiangkouji M_S 43/4) took place in the area. To sum up, the earth's crust of the area has a weak activity to show mainly creep-slip active mode since the Late Pleistocene.
By means of seismic geological survey and synthesis analyze research in the Funan-Huoqiu area to locate bordering tectonic belt between the North China and South China active block areas, the authors discovered that there were relative feebleness tectonic deformation phenomena in this area since the Late Pleistocene, such as, some small earthquakes distribute linearly along the main fault, there were conjugate joints developed in Late Pleistocene near the fault and in the southern area, the fissures of different lengths, widths and directions occurred in succession in the northern Gushi,the Huoqiu and Funan area in the 1970's, the fissures were consistent approximately with the Feizhong fault or Wanglaorenji fault. The authors considered that the small earthquakes were crowded in the local area, the conjugate joints developed in the Late Pleistocene, the microscopic kneaded deformation occurred in the filling material of the joints and the fissures occurred in the area in the 1970's reflected that the energy of the earth's crust was released slowly and the correspondence faults moved about weakly. There was only one destructive earthquake (Jiangkouji M_S 43/4) took place in the area. To sum up, the earth's crust of the area has a weak activity to show mainly creep-slip active mode since the Late Pleistocene.
引文
①安徽省地质矿产局,1976,亳县、阜阳、蒙城、固始、寿县、定远、合肥幅,1∶20万区域地质调查报告。
②安徽省地质调查院,1999,安徽省卫星遥感影像地图(1∶50万)。
安徽省地质矿产局,1987a,安徽省区域地质志,北京:地质出版社。
安徽省地质矿产局,1987b,安徽省地层志,合肥:安徽科技出版社。
安徽省地震局,1989,安徽省志·地震志,合肥:安徽人民出版社。
顾功叙等,1983,中国地震目录,北京:科学出版社。
郭良迁、黄立人,2000,中国大陆地壳的应变应力场研究,华北地震科学,18(3),50～58。
姚大全、汤有标、李 杰等,1993,活动断裂带上粘滑与蠕滑标志及其研究意义,地球物理学进展,8(4),140～148。
张培震、邓起东、张国民等,2003a,中国大陆的强震活动与活动地块,中国科学,D辑,(增刊),12～20。
张培震、王 敏、甘卫军等,2003b,GPS观测的活动断裂滑动速率及其对现今大陆动力作用的制约,地学前缘,特刊,81～ 92。
晁洪太、李家灵、崔昭文等,1997,郯庐断裂带潍坊-嘉山段全新世断层活动方式与发震模式,地震研究,20(2),218～226。
②安徽省地质调查院,1999,安徽省卫星遥感影像地图(1∶50万)。
安徽省地质矿产局,1987a,安徽省区域地质志,北京:地质出版社。
安徽省地质矿产局,1987b,安徽省地层志,合肥:安徽科技出版社。
安徽省地震局,1989,安徽省志·地震志,合肥:安徽人民出版社。
顾功叙等,1983,中国地震目录,北京:科学出版社。
郭良迁、黄立人,2000,中国大陆地壳的应变应力场研究,华北地震科学,18(3),50～58。
姚大全、汤有标、李 杰等,1993,活动断裂带上粘滑与蠕滑标志及其研究意义,地球物理学进展,8(4),140～148。
张培震、邓起东、张国民等,2003a,中国大陆的强震活动与活动地块,中国科学,D辑,(增刊),12～20。
张培震、王 敏、甘卫军等,2003b,GPS观测的活动断裂滑动速率及其对现今大陆动力作用的制约,地学前缘,特刊,81～ 92。
晁洪太、李家灵、崔昭文等,1997,郯庐断裂带潍坊-嘉山段全新世断层活动方式与发震模式,地震研究,20(2),218～226。
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