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物探与化探  2023, Vol. 47 Issue (1): 73-80    DOI: 10.11720/wtyht.2023.1107
  地质调查·资源勘查 本期目录 | 过刊浏览 | 高级检索 |
藏东南冻错曲塘布段冰碛物电阻率特征
蒋首进(), 陈永凌(), 李怀远, 胡俊峰
中国地质调查局 应用地质研究中心,四川 成都 610000
Resistivity of moraine deposits in the Tangbu section, Dongcuoqu, southeastern Tibet
JIANG Shou-Jin(), CHEN Yong-Ling(), LI Huai-Yuan, HU Jun-Feng
Research Center of Applied Geology of China Geological Survey, Chengdu 610000, China
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摘要 

藏东南怒江流域冻错曲塘布段周边区域普遍发育有冰斗、刀脊、角峰、高山湖泊等冰川地貌,表明该区历史上曾发生强烈的冰川活动,但实地调查发现该段第四系地表主要分布崩坡积物、冲洪积物。对该区域音频大地电磁测深和高密度测量成果开展综合分析时发现,该段第四系电性特征与冰碛堆积结构具有高度一致性,结合周边普遍发育的冰川地貌,推断该段第四系主要是以冰碛堆积为主、在冰碛堆积上覆盖有一层崩坡积物和冲洪积物。从物探成果电性结构特征看,音频大地电磁测深电阻率成果可有效反映冰碛堆积厚度、基岩面冰蚀凹谷、冰碛透镜体等结构特征;高密度测量电阻率成果可较好反映冰碛混杂堆积、冰碛透镜体、大体积块石长轴方向等特征。

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蒋首进
陈永凌
李怀远
胡俊峰
关键词 音频大地电磁测深高密度测量冰碛堆积电性特征    
Abstract

Glacial landforms, such as cirques, razorback ridges, horn peaks, and alpine lakes, are commonly developed in the surrounding areas of the Tangbu section of Dongcuoqu in the Nujiang River Basin in southeastern Tibet, indicating that intensive glacial activities once occurred in this area. However, field surveys show that proluvium and alluvial-diluvial deposits are mainly distributed in the Quaternary surface of this section. The comprehensive analysis of the audio-frequency magnetotellurics and high-density measurement results of this area show that the electrical characteristics of the Quaternary in this section are highly consistent with the moraine deposit structure. Combined with the commonly developed glacial landforms in the surrounding area, it can be inferred that the Quaternary stratum in this section is mainly dominated by moraine deposits, which are covered with a layer of proluvium and alluvial-diluvial deposits. From the perspective of the electrical structure characteristics of the geophysical exploration results, the resistivity results of the audio-frequency magnetotellurics can effectively reflect the structural characteristics including the thickness of the moraine deposits, glacial valleys on the bedrock surface, and moraine lenses, and the resistivity results from high-density measurement can well reflect the characteristics of moraine melange, moraine lenses, and the long axis direction of large boulders.

Key wordsaudio magnetotelluric sounding    high-density measurement    moraine deposit    electrical characteristics
收稿日期: 2022-03-17      修回日期: 2022-05-24      出版日期: 2023-02-20
ZTFLH:  P631  
基金资助:中国地质调查局“公益性基础性综合地质调查”项目(DD20211555)
通讯作者: 陈永凌(1988-),男,硕士研究生,工程师,研究方向为矿产地球物理。Email:476811938@qq.com
作者简介: 蒋首进(1987-),男,硕士研究生,工程师,研究方向为电法、电磁法的理论与应用。Email:3125007187@qq.com
引用本文:   
蒋首进, 陈永凌, 李怀远, 胡俊峰. 藏东南冻错曲塘布段冰碛物电阻率特征[J]. 物探与化探, 2023, 47(1): 73-80.
JIANG Shou-Jin, CHEN Yong-Ling, LI Huai-Yuan, HU Jun-Feng. Resistivity of moraine deposits in the Tangbu section, Dongcuoqu, southeastern Tibet. Geophysical and Geochemical Exploration, 2023, 47(1): 73-80.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1107      或      https://www.wutanyuhuatan.com/CN/Y2023/V47/I1/73
Fig.1  塘布段地质概况
岩性 视电阻率统计区间/
(Ω·m)
视电阻率平均值/
(Ω·m)
冲洪积物 334~868 523
残坡积物 746~3155 1704
花岗闪长岩 7356~14915 10902
砂质板岩 2268~9869 5279
石英砂岩 733~5225 1965
粉砂岩 431~2116 1073
砂岩 335~1163 687
板岩 186~680 305
Table 1  工作区典型岩土体电性参数实测统计
Fig.2  塘布段第四系音频大地电磁成果
Fig.3-1  高密度二维反演成果
Fig.3-2  高密度二维反演成果
Fig.4  对数坐标系下三维反演视电阻率交会
Fig.5  高密度三维反演成果
Fig.6  低阻体三维空间结构
Fig.7  高阻体三维空间结构
Fig.8  高、中、低阻体三维空间关系
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