多源遥感与重力数据下的滁河断裂空间展布及构造特征

Spatial Distribution and Structural Characteristics of Chuhe Fault Derived from Multi-Source Remote Sensing and Gravity Data

本文以滁河断裂为研究对象,利用多源遥感影像及布格重力数据,分析区域构造地貌及深部构造特征,揭示滁河断裂的空间展布、深部特征、分段性及其与郯庐断裂带安徽段的交切关系。结果表明,遥感影像中滁河断裂可分为两段,即西南段出露区和东北段隐伏区,位于青苔山、殷家山、小独山、求山四个地点中,高分辨率KH影像中可见系列残山边界均形成了NE走向的线性陡崖地貌,断裂两侧地势表现为西北高、东南低的特点;重力场显示,滁河断裂在浅层形成线性或串珠状重力异常特征,而在深部形成大型的重力梯度带,分隔着两侧的隆坳构造单元,该断裂切割至下地壳深度,是区域内一条深大断裂;滁河断裂从地貌到深部均存在明显的分段性,断裂地貌上西南端为巢湖,而深部为桥头集-东关断裂所截切,因此不与郯庐断裂带交切。

This paper takes the Chuhe fault as the research object,analyzes the regional tectonic geomorphology and deep structural features by using multi-source remote sensing image and Bouguer gravity data.These data also reveal the spatial distribution,deep features and segmentation of the Chuhe fault.Intersection relationship between the Anhui section of the Tanlu fault zone and the Chuhe fault is obtained.The results show that the Chuhe fault can be divided into two sections,namely the southwest section outcrop area and the northeast section concealed area.In Qingtai Mountain,Yinjia Mountain,Xiaodu Mountain and Qiu Mountain,the boundary of the residual mountain forms a linear steep cliff topography with NE trend based on the high resolution KH image.The terrain on the two sides of the fault is high on the northwest and low on the southeast.The gravity field shows that the Chuhe fault has linear or beaded gravity anomaly characteristics in the shallow layer.A large gravity gradient zone is formed in the deep layer,which separates the structural elements on its twosides.The fault is cut to the depth of the lower crust,which is a deep fault in the area.The Chuhe fault has obvious segmentation features from the topography to the deep.The fractured landform is the Chaohu Lake at the southwestern end,and the deep part is cut by the Qiaotou-Dongguan fault,so it does not intersect with the Tanlu fault zone.