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物探与化探  2021, Vol. 45 Issue (4): 913-922    DOI: 10.11720/wtyht.2021.1445
  地质调查·资源勘查 本期目录 | 过刊浏览 | 高级检索 |
银川盆地东缘黄河断裂展布特征新认识
虎新军(), 陈晓晶(), 李宁生, 仵阳, 陈涛涛
宁夏回族自治区地球物理地球化学勘查院,宁夏 银川 750001
New understanding of the distribution characteristics of the Yellow River fault on the eastern margin of Yinchuan Basin
HU Xin-Jun(), CHEN Xiao-Jing(), LI Ning-Sheng, WU Yang, CHEN Tao-Tao
Geophysical and Geochemical Exploration Institute of Ningxia,Yinchuan 750001,China
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摘要 

作为宁夏北部重要的区域性断裂之一,黄河断裂控制了银川新生代断陷盆地形成与演化,是研究银川平原地震活动及地热资源富集规律不可避免的关键点之一。目前,专项针对黄河断裂的研究较少,以地表调查为主,局部地区开展了浅层地球物理勘探。本文以地质露头资料为线索,基于区域1:20万重力资料,利用小波分界、斜导数等地球物理数据处理技术,清晰刻画出黄河断裂具有“雁行式”平面展布特征,据此将断裂划分为灵武段、临河段、月牙湖段与礼和段4个亚段;临河段与灵武段的CSAMT资料揭示黄河主断裂及其次级断裂由东向西呈逐级下掉的“阶梯状”,具有明显的“分级”特征。黄河主断裂下切深度直抵上地壳,剖面上与次级规模断裂组合形态呈现典型的“扫帚”状,各条断裂“上陡、中缓、下陡”的“座椅式”空间赋存形态明显。与已有研究成果对比发现,二者之间存在展布特征、展布位置、展布关系3方面的差异。

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虎新军
陈晓晶
李宁生
仵阳
陈涛涛
关键词 黄河断裂小波分解CSAMT剖面“雁行式”特征黄河断裂带    
Abstract

As one of the important regional faults in northern Ningxia, the Yellow River fault has controlled the formation and evolution of Yinchuan Basin. This fault is one of the inevitable key points for studying the law of seismic activity and geothermal resource enrichment in Yinchuan plain. At present, the study of the Yellow River fault is very insufficient, and the work is mainly concentrated on surface survey with shallow geophysical exploration in some areas. In this paper, the authors used geological outcrop data as clues and, based on regional 1:200000 gravity data, used advanced geophysical data processing techniques such as wavelet demarcation and oblique derivative to clearly depict the phenomenon that the Yellow River fault has obvious characteristics of "flying geese" plane distribution. The fault is divided into four sub-segments: Lingwu section, Linhe section, Yueyahu section and Lihe section. The CSAMT data of Linhe section and Lingwu section reveal that the main fault and its secondary faults of the Yellow River descend gradually from east to west, i.e., "staircase", with obvious "grading" characteristics. The undercut depth of the Yellow River main fault reaches the upper crust, and the combination of the secondary-scale faults on the profile exhibits a typical "broom" shape. The "seat-like" space of "upward steep, moderately gentle, and downward steep" of each fault is obviously present. Compared with the existing research results, it is found that there are three differences between them, i.e., spreading characteristics, spreading position, and spreading relationship.

Key wordsYellow River fault    wavelet analysis    CSAMT section    feature of "geese"    Yellow River fault zone
收稿日期: 2020-09-08      修回日期: 2021-01-18      出版日期: 2021-08-20
ZTFLH:  P631  
基金资助:宁夏回族自治区重点研发计划重大(重点)项目(2018BFG02012);宁夏深部探测方法研究示范创新团队项目(KJT2019005);宁夏自然科学基金项目(2020AAC03449)
通讯作者: 陈晓晶
作者简介: 虎新军(1987-),男,宁夏银川市人,工程师,主要从事地球物理勘探研究工作。Email: junyan_home@126.com
引用本文:   
虎新军, 陈晓晶, 李宁生, 仵阳, 陈涛涛. 银川盆地东缘黄河断裂展布特征新认识[J]. 物探与化探, 2021, 45(4): 913-922.
HU Xin-Jun, CHEN Xiao-Jing, LI Ning-Sheng, WU Yang, CHEN Tao-Tao. New understanding of the distribution characteristics of the Yellow River fault on the eastern margin of Yinchuan Basin. Geophysical and Geochemical Exploration, 2021, 45(4): 913-922.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2021.1445      或      https://www.wutanyuhuatan.com/CN/Y2021/V45/I4/913
Fig.1  银川盆地构造单元划分(据文献[1]修编)
Fig.2  黄河断裂平面特征分析
a—重力小波1阶逼近场;b—重力小波2阶逼近场;c—重力小波3阶逼近场;d—重力小波4阶逼近场
Fig.3  黄河断裂平面展布
Fig.4  黄河断裂地貌特征
Fig.5  黄河断裂剖面结构
Fig.6  黄河断裂灵武段剖面特征
a—剖面位置图;b—L1剖面;c—L2剖面;d—L3剖面
Fig.7  黄河断裂分布特征对比
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