地质雷达探测技术在浅覆盖活动构造区填图中的应用——以宁夏青铜峡地区1:5万新构造与活动构造区填图为例

发布时间：2018-06-03 00:48

本文选题：地质雷达 + 活动构造区　；参考：《地质力学学报》2017年02期

【摘要】：地质雷达探测以其分辨率高、定位准确、快速经济、灵活方便、剖面直观、实时图像显示等优点,成为地质调查中广泛使用的一种探测方法。本次宁夏青铜峡地区1∶5万新构造与活动构造区填图中运用地质雷达探测技术对第四系和隐伏断层进行了探测。结果表明,40 MHz地质雷达可以有效地探测地表以下30 m内的第四系结构,可清晰地识别出3套第四纪地层。这一地层结构划分被第四系浅钻证实,其为第四系全新统灵武组,自下而上由泥岩、砂砾石层和含砾的砂或泥等3套地层组成。对测区主干断裂——柳木高断裂南段的地质雷达探测表明,断裂带表现为近地表发散向下汇聚的正花状结构,这与探槽揭露的特征一致,表明地质雷达探测可以准确标定隐伏断层平面位置与垂向精细结构。本次宁夏地质填图证实,地质雷达技术是浅覆盖活动构造区进行隐伏断裂调查和第四纪地层层序划分的可行、高效、便捷的技术方法之一。
[Abstract]:Because of its advantages of high resolution, accurate positioning, rapid and economical, flexible and convenient, intuitive section and real-time image display, GPR has become a widely used detection method in geological survey. The geological radar technique was used to detect the Quaternary and concealed faults in the mapping of the new tectonic and active tectonic areas of Qingtongxia area of Ningxia. The results show that the Quaternary system structure within 30 m below the surface of the earth can be effectively detected by the MHz geologic radar, and three sets of Quaternary strata can be clearly identified. This stratigraphic structure is confirmed by shallow drilling of Quaternary system. It is a new Lingwu formation of Quaternary and consists of three sets of strata from bottom to top, such as mudstone, gravel layer and gravel sand or mud. The geological radar survey of the southern segment of the main fault-Liumu high fault shows that the fault zone shows a positive flower structure with divergence and downward convergence near the surface, which is consistent with the characteristics revealed by the grooves. It is shown that the ground penetrating radar can accurately calibrate the plane position and vertical fine structure of the hidden fault. The geological mapping in Ningxia confirms that the geological radar technique is one of the feasible, efficient and convenient techniques for the investigation of hidden faults and the division of the Quaternary stratigraphic sequence in the active tectonic area with shallow coverage.
【作者单位】：中国地质大学(北京)地球科学与资源学院;中国地质科学院地质力学研究所;
【基金】：中国地质调查局地质调查项目“特殊地质地貌区填图试点”(DD20160060)
【分类号】：P631.3

【相似文献】