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物探与化探  2022, Vol. 46 Issue (4): 816-823    DOI: 10.11720/wtyht.2022.1196
  地质调查·资源勘查 本期目录 | 过刊浏览 | 高级检索 |
东天山某环状熔融岩体航空电磁场特征及深部找矿研究
杨波1,2,3(), 孙栋华1,2,3
1.核工业航测遥感中心,河北 石家庄 050002
2.河北省航空探测与遥感技术重点实验室,河北 石家庄 050002
3.中核集团铀资源地球物理勘查技术中心(重点实验室),河北 石家庄 050002
Airborne electromagnetic characteristics and deep prospecting of a ringed molten rock mass in eastern Tianshan
YANG Bo1,2,3(), SUN Dong-Hua1,2,3
1. Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002, China
2. Hebei Provincial Key Laboratory of Aerial Detection and Remote Sensing Technology, Shijiazhuang 050002, China
3. CNNC Uranium Resources Geophysical Exploration Technology Center (Key Laboratory), Shijiazhuang 050002, China
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摘要 

新疆东天山某环状熔融岩体与金铅锌矿成矿关系密切,已知矿化产于岩体与地层外接触带附近的断裂破碎带中,需要查明岩体空间展布特征以及断裂构造发育情况。通过对实测的1∶2.5万高精度航空瞬变电磁和航磁数据的处理和分析,可知环状熔融岩体在航磁上表现为正、负相间排列的环状磁场面貌;沿环状熔融岩体出现了4片NWW向展布的条带状电磁响应强烈区,时间常数一般为0.07~0.18 ms。以dB/dt X分量第23道的电磁响应高值带和5~10 nT航磁磁异常带为标志,推断解释了NWW向断裂7条。综合航空电、磁特征及磁矢量三维反演结果,对研究区岩性、构造重新进行了推断解释,大致查明闪长岩体的三维空间展布特征。结合已知矿成矿地质条件和航空电、磁特征,在环状熔融岩体的西部和西南部的电磁响应强烈区圈定了2片找矿有利地区。本次研究为该岩体的深部找矿提供了重要资料。

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杨波
孙栋华
关键词 环状熔融岩体航空瞬变电磁航磁深部找矿东天山    
Abstract

A ringed molten rock mass in eastern Tianshan, Xinjiang is closely related to Au-Pb-Zn mineralization. Since the mineralization occurs in the fault fracture zone near the outer contact zone between the rock mass and strata, it is necessary to find out the spatial distribution of the rock mass and the development of the fault structure. The processing and analysis of the 1∶25 000 high-resolution airborne transient electromagnetic and aeromagnetic data yielded the following airborne electromagnetic characteristics of the rock mass. The ringed molten rock mass displayed positive and negative alternating ringed aeromagnetic fields. There were four NWW-trending banded zones with strong electromagnetic responses along the ringed molten rock mass, with a time constant of generally 0.07~0.18 ms. Seven NWW-trending faults were inferred and interpreted using the high-value band of the electromagnetic response of the 23rd trace of the dB/dt X component and the aeromagnetic anomaly zone with amplitude of 5~10 nT. By combining the airborne electromagnetic characteristics and three-dimensional inversion results of magnetic vectors, the lithology and structures of the study area were inferred and interpreted again, roughly ascertaining the three-dimensional distribution characteristics of the diorites. Based on these results as well as the known metallogenic geological conditions and the airborne electromagnetic characteristics, two prospecting favorable areas were delineated in the areas with strong electromagnetic responses to the west and southwest of the ringed molten rock mass. This study provides important information on the deep prospecting of the rock mass.

Key wordsringed molten rock mass    airborne transient electromagnetic    aeromagnetic    deep prospecting    eastern Tianshan
收稿日期: 2021-04-08      修回日期: 2021-11-01      出版日期: 2022-08-20
ZTFLH:  P631  
基金资助:新疆维吾尔自治区国土资源厅项目“新疆托克逊县铜花山-彩华沟一带1∶2.5万航空TEM测量”(新国土资函[2015]623号)
作者简介: 杨波(1984-),男,硕士,高级工程师,主要从事航空地球物理勘探及研究工作。Email: yangbo4100064@163.com
引用本文:   
杨波, 孙栋华. 东天山某环状熔融岩体航空电磁场特征及深部找矿研究[J]. 物探与化探, 2022, 46(4): 816-823.
YANG Bo, SUN Dong-Hua. Airborne electromagnetic characteristics and deep prospecting of a ringed molten rock mass in eastern Tianshan. Geophysical and Geochemical Exploration, 2022, 46(4): 816-823.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1196      或      https://www.wutanyuhuatan.com/CN/Y2022/V46/I4/816
Fig.1  研究区及金铅锌矿区地质简图
Fig.2  移动Tau法计算时间常数示意
Fig.3  薄板状体在X分量及经FF滤波的X分量响应示意
Fig.4  研究区航电时间常数影像
Fig.5  航电dB/dt早期道(10道)电磁响应影像
Fig.6  航电dB/dt X分量经Fraser滤波后第23道电磁响应影像
Fig.7  研究区低阻体三维分布及部分测线电阻率断面叠合
Fig.8  航磁总场化极影像
Fig.9  航磁垂向一阶导数影像
Fig.10  研究区推断岩体空间分布及部分测线反演磁化率
Fig.11  推断解释岩性构造
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