| 李世斌,马为,吴晓飞,雷清,范剑.太行山东南缘重力场特征及基底构造研究[J].矿产勘查,2023,14(7):1124-1140 |
| 太行山东南缘重力场特征及基底构造研究 |
| Study on the characteristics of gravity field and basement structure in the southeast margin of Taihang Mountains |
| 投稿时间：2023-04-17 修订日期：2023-06-05 |
| DOI：10.20008/j.kckc.202307013 |
| 中文关键词: 太行山东南缘 布格重力异常 位场转换 基底构造 莫霍面 密度剖面建模 |
| 英文关键词: southeast margin of Taihang Mountains bouguer gravity anomaly potential field transformation basement structure Moho interface density profile modeling |
| 基金项目:本文受中央地质勘查基金项目“河北省丰宁县上黄旗镇老虎沟门一带金银矿普查”（2011130002）资助。 |
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| 中文摘要: |
| 为研究太行山东南缘基底构造特征，本文选用区域布格重力面积数据及1∶2.5万重力剖面数据，利用位场边界增强方法处理，分析断裂构造平面展布；采用小波变换方法进行场源分解处理，剖析不同深度下地壳横向结构；采用Parker变密度模型反演该地区的莫霍面深度，构建两条地壳密度结构剖面模型，查明研究区基底构造的分布特征、对局部断裂进行了精细厘定和修正。结果表明，研究区重力场整体呈现NE、NNE向的异常，并存在数量较多的小尺度线性重力梯度条带。区内断裂带多沿重力高、低异常梯度条带分布，并控制构造单元的走向。沉积层至上地壳的地壳结构复杂，形成多个明显的以NE、NNE方向为主的构造单元以及3条NE向区域性断裂，延伸至下地壳，次级断层延伸至中、上地壳，区域莫霍面深度为37.0～39.8 km，整体表现为西深、东浅的特点。综上所述，本文研究成果可为研究区断裂活动性、基础地质研究及矿产、清洁资源勘查提供依据，并为类似地质区域的基底构造研究提供了新的思路，具有一定的科学和实际应用价值。 |
| 英文摘要: |
| In order to study the basement structure characteristics of the southeastern margin of Taihang Mountain， this paper selects the regional Bouguer gravity area data and 1∶25，000 gravity profile data were processed by potential field boundary enhancement method， the plane distribution of fault structures was analyzed， the field source decomposition was performed by wavelet transform method， the transverse structure of the lower crust at different depths was analyzed， the Moho depth of the region was retrieved by Parker variable density model， and two crustal density profile models were constructed. The distribution characteristics of basement structures in the study area are identified， and the local faults are fine-determined and corrected. The results show that the gravity field in the study area presents NE and NNE anomalies， and there are a large number of small-scale linear gradients. Most of the fault zones in the region are distributed along high gravity and low anomaly gradients and control the strike of tectonic units. The crustal structure of the upper crust of the sedimentary layer is complex， forming a number of obvious NE and NNE direction as the main tectonic units and three NE direction regional faults extending to the lower crust， and secondary faults extending to the middle and upper crust. The regional moho depth is 37.0-39.8 km， and the overall performance is deep in the west and shallow in the east. In summary， the research results of this paper provide a basis for the study of fault activity， basic geology and mineral and clean resources exploration in the study area， and provide a new idea for the study of basement structure in similar geological areas， which has certain scientific and practical application value. |
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