磁异常三维反演在磁铁矿勘查中的应用

doi:10.11720/wtyht.2024.0167

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Abstract

The Galinge iron deposit in Qinghai is overlain by deposits measuring greater than 150 m in thickness. The great burial depths of ore bodies lead to gentle magnetic anomaly morphology, making it difficult to characterize the spatial distribution of ore bodies. Therefore, this study employed three-dimensional magnetic anomaly inversion to determine the three-dimensional distribution characteristics of subsurface magnetic intensity in the study area. Given the prior information of non-magnetic surrounding rocks, the three-dimensional magnetic intensity model clearly presented the spatial distribution of the ore bodies and reflected the presence of intense magnetic bodies at depths of less than 500 m in existing boreholes. Accordingly, it can be inferred that there exist concealed ore bodies at depths exceeding 500 m in the study area. The results of this study suggest that three-dimensional magnetic anomaly inversion can effectively improve target identification, providing clear information on the horizontal positions, depths, and scales of magnetic ore bodies. The proposed inversion method can offer strong support for drilling design and reserve estimation, warranting promotion in detailed exploration of solid minerals.

Key words： magnetic survey three-dimensional inversion magnetite exploration Galinge deposit

Received: 15 April 2024 Published: 08 January 2025

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	Bai-Ru ZHAO
	Hou-Pu LI
	Heng-Lei ZHANG

Cite this article:

Bai-Ru ZHAO,Hou-Pu LI,Heng-Lei ZHANG. Application of three-dimensional magnetic anomaly inversion in magnetite exploration[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1626-1632.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.0167 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1626

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The geological map in Galinge depoist(adapted from Zhang et al.^[24])

Magnetic measurement data sheet for rock and mineral specimens in the study area

Figure 3, edited according to Wang et al.^[3])
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Cross-section of borehole line 9
(with the location of the section as shown in Figure 3, edited according to Wang et al.^[3])

Magnetic anomaly ΔT in the study area

The correlation coefficient diagram between the RTP anomaly and the vertical derivative of the normalized magnetic source intensity

Inverse iteration mean square error curve

Three-dimensional inversion fitting of magnetic anomalies (a) and residual magnetic anomalies (b)

Three-dimensional magnetization intensity horizontal slice at 200 meters depth

Three-dimensional magnetization intensity depth slice
(The arrow lines represent the drillhole locations, and the black blocks represent the ore ranges illustrated by the drilling)

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