磁铁矿矿致磁异常测定方法及其应用

doi:10.11720/wtyht.2025.0345

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摘要

准确、快速地确定磁异常源的地质属性是磁法勘探的关键技术之一,直接影响到利用磁测数据开展地质解释的准确性。感应磁化强度随时间变化,剩余磁化强度一般不随时间变化,因此,理论上可以通过探测磁异常强度随时间变化特征来研究磁异常场源体性质。虽然前人开展过相关研究,但目前尚未形成实用的技术方法。本文提出利用地磁日变观测数据,构建磁异常强度变化量A参数、磁异常强度变化率η参数和归一化磁异常强度变化量F参数来评估强磁异常场源体性质,确定磁异常是否为磁铁矿引起的新方法,该方法对磁铁矿勘探具有重要意义。

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	范正国
	杨海
	葛藤菲
	何敬梓
	贾志业
	范振宇
	刘前坤
	杨雪

关键词 ：磁法勘探, 感应磁化强度, 剩余磁化强度, 矿致异常, 地磁日变, 磁铁矿, 磁异常强度变化量

Abstract：

Accurately and quickly determining the geological properties related to magnetic anomaly sources is a key technical challenge in magnetic prospecting, directly influencing the accuracy of geological interpretation using magnetic survey data. The induced magnetization varies with time, whereas the remanent magnetization typically remains constant over time. Therefore, there exists a theoretical basis for investigating the properties of magnetic anomaly source bodies by detecting the time variations of magnetic anomaly intensity. Despite geophysicists' relevant research in this field, practical technical methods have not been established. Hence, this study proposed a novel method for determining magnetite ore-induced magnetic anomalies. Based on the observational data of geomagnetic diurnal variations, the proposed method constructed parameters, including the variations (A), variation rate (η), and normalized variations (F) of magnetic anomaly intensity, to evaluate the properties of strong magnetic anomaly source bodies. Accordingly, the proposed method determined the possibility of magnetite ore-induced magnetic anomalies, showing critical significance for magnetite exploration.

Key words： magnetic prospecting induced magnetization remanent magnetization ore-induced anomaly geomagnetic diurnal variation magnetite variation of magnetic anomaly intensity

收稿日期: 2025-09-16 修回日期: 2025-10-14 出版日期: 2025-12-20

ZTFLH:

P631.1

基金资助:国家重点研发计划项目“低缓磁异常弱信息提取与富铁矿体定位技术示范”(2022YFC2903704);省部合作项目(2024ZRBSHZ132-2);中国地质调查局地质调查项目(DD20240119);中国地质调查局地质调查项目(DD20243245)

通讯作者: 何敬梓

引用本文:

范正国, 杨海, 葛藤菲, 何敬梓, 贾志业, 范振宇, 刘前坤, 杨雪. 磁铁矿矿致磁异常测定方法及其应用[J]. 物探与化探, 2025, 49(6): 1251-1260.
FAN Zheng-Guo, YANG Hai, GE Teng-Fei, HE Jing-Zi, JIA Zhi-Ye, FAN Zhen-Yu, LIU Qian-Kun, YANG Xue. A novel method for determining magnetite ore-induced magnetic anomalies and its application. Geophysical and Geochemical Exploration, 2025, 49(6): 1251-1260.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2025.0345 或 https://www.wutanyuhuatan.com/CN/Y2025/V49/I6/1251

Fig.1 山东省平阴地区地磁场随时间变化曲线(据参考文献[25])

Fig.2 山东省邹平—金岭地区大地构造位置图(a)(据文献[30-31]改)和区域地质简图(b)(据文献[37]改)

Table 1 邹平磁异常区和金岭磁异常区磁性特征及异常强度

Fig.3 山东省邹平—金岭地区航磁ΔT等值线及磁日变站分布示意

Table 2 孟白庄、王旺庄、侯家庄和北金召4处磁异常的测量数据处理结果

Fig.4 孟白庄磁异常背景日变站(T_b)和异常日变站(T_a)磁日变曲线

Fig.5 王旺庄磁异常背景日变站(T_b)和异常日变站(T_a)磁日变曲线及总噪声(S)

Fig.6 侯家庄磁异常背景日变站(T_b)和异常日变站(T_a)磁日变曲线

Table 3 磁异常强度变化量A值及磁异常强度变化率η

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