内蒙古额济纳旗东北部雅干断裂带深部构造特征分析——来自大地电磁的证据

doi:10.11720/wtyht.2024.1478

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摘要

内蒙古额济纳旗东北部雅干断裂带的空间展布及深部构造特征一直存在争议。本文按照“由已知到未知”的研究思路,在研究区内完成5条大地电磁测深剖面,首先对研究区内西侧大地电磁剖面MT01的电性结构特征与剖面区段内所出露的雅干断裂带地质构造信息之间的关系进行了深入分析,确定了雅干断裂带的电性特征表现为“北倾+大倾角+大深度”的电阻率梯级带,并以此作为特征标志,结合区内东侧覆盖区内4条MT剖面(MT02~MT05)反演解释结果,识别出各剖面区段内雅干断裂带的深部位置及构造特征。同时,采用阻抗张量分解技术获得了各条MT剖面的电性主轴方向,结合二维反演解释结果确定了雅干断裂带空间走向。结果表明,研究区内雅干断裂带在浅地表处总体走向为近EW向(深部为NE45°),平均宽度约6.8 km,是一条由西向东且逐渐向北弧形偏转的逆断层,断层倾向总体向北,断层倾角60°~67°,断层深度约20 km。本文所获得的深部电性结构模型有效地揭示了研究区内深部构造特征,对于区域构造演化研究具有一定的参考意义。

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	王文杰
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	孙大鹏
	徐浩清

关键词 ：额济纳旗, 雅干断裂带, 大地电磁测深, 电性结构特征

Abstract：

There exists a continued debate concerning the spatial distribution and deep structural characteristics of the Yagan fault zone in northeastern Ejina Banner, Inner Mongolia. Adhering to the known-to-unknown research approach, this study completed five magnetotelluric sounding (MT) profiles. First, it delved into the relationship between the electrical structure characteristics of a MT profile (MT01) on the west side of the study area and the geological structure information of the Yagan fault zone within the profile. In terms of electrical characteristics, the Yagan fault zone was determined as a resistivity gradient zone characterized by northward dip, high dip angles, and deep depths. Based on these characteristics, and combined with the inversion interpretation results of four MT profiles (MT02~MT05) on the east side, this study identified the deep positions and structural characteristics of the Yagan fault zone within all the MT profiles. Moreover, it determined the major electrical directions of all the MT profiles using the impedance tensor decomposition technique, and the spatial trend of the Yagan fault zone based on the two-dimensional inversion interpretation results. As revealed by the results, the Yagan fault zone within the study area exhibits an overall nearly EW strike at the shallow surface and a strike of NE45° in the deep part, with an average width of approximately 6.8 km. It is a reverse fault with a gradual arc deflection to the north from west to east, manifesting a generally northward dip direction, dip angles ranging from 60° to 67°, and a fault depth of about 20 km. The obtained deep electrical structure model effectively reveals the deep structural characteristics of the study area. providing certain reference significance for the study of regional tectonic evolution

Key words： Ejina Banner Yagan fault zone magnetotelluric sounding (MT) electrical structure characteristics

收稿日期: 2023-11-10 修回日期: 2023-12-12 出版日期: 2024-06-20

ZTFLH:

P631

基金资助:中国地质调查局项目“内蒙古自治区额济纳旗辉森乌拉等三幅1∶5万区域地质调查”(DD20230252)

通讯作者: 陈磊(1989-),男,内蒙古乌兰察布人,大学本科,主要从事矿产勘查、地质钻探和深部找矿研究工作。Email:chenlei@mail.cgs.gov.cn

作者简介: 王文杰(1992-),男,内蒙古丰镇人,硕士研究生,主要从事综合地球物理勘查与数据处理解释研究工作。Email:wangwenjie_cugb@163.com

引用本文:

王文杰, 陈磊, 雷聪聪, 石晓峰, 杨彪, 王文宝, 孙大鹏, 徐浩清. 内蒙古额济纳旗东北部雅干断裂带深部构造特征分析——来自大地电磁的证据[J]. 物探与化探, 2024, 48(3): 640-650.
WANG Wen-Jie, CHEN Lei, LEI Cong-Cong, SHI Xiao-Feng, YANG Biao, WANG Wen-Bao, SUN Da-Peng, XU Hao-Qing. Deep structural characteristics of the Yagan fault zone in northeastern Ejina Banner, Inner Mongolia: Evidence from magnetotelluric sounding. Geophysical and Geochemical Exploration, 2024, 48(3): 640-650.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.1478 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I3/640

Fig.1 研究区大地构造位置及地质与构造简图
a—研究区大地构造位置;b—研究区地质与构造简图

Table 1 研究区内岩石电性测定结果统计结果

Fig.2 研究区各类岩石电阻率特征
a—区域地层岩石电阻率特征;b—区域岩浆岩电阻率特征

Fig.3 大地电磁测深剖面位置

Fig.4 典型测点大地电磁观测曲线
a—研究区西北侧岩浆岩体大地电磁观测曲线;b—研究区中部盆地大地电磁观测曲线

Fig.5 MT01~MT05剖面相位张量二维偏离度

Fig.6 研究区大地电磁测深剖面构造主轴分析结果

Fig.7 雅干断裂野外照片(a1)、(a2)及MT01剖面大地电磁测深二维反演结果(b)

Fig.8 MT02~MT05剖面大地电磁测深二维反演与解释结果

Table 2 推断雅干断裂带构造特征

Fig.9 推测雅干断裂带二维电性结构特征及浅地表空间走向
a—雅干断裂带电性结构(三维展示);b—浅地表推测雅干断裂带空间走向位置

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