Application of three-dimensional magnetic anomaly inversion in magnetite exploration
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摘要: 由于青海尕林格铁矿区上覆有超过150 m厚的沉积覆盖层, 矿体埋深大, 使得磁异常形态平缓, 难以刻画矿体的空间分布特征。因此, 本文采用磁异常三维反演方法获得研究区地下三维磁化强度分布特征。结合该区围岩无磁性的先验信息, 三维磁化强度模型不仅能较清晰地显示矿体的空间分布特征, 而且反映了现有500 m以浅的钻孔下方存在强磁性体的分布, 推断区内500 m深度以下存在隐伏矿体。研究结果表明, 磁异常三维反演可以有效地提升目标体的识别能力, 能够较清晰地显示磁性矿体的水平位置、深度及规模等信息, 可以为钻探设计、储量评估等提供有力依据, 值得在固体矿产勘探详查中推广应用。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.
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Key words:
- magnetic survey /
- three-dimensional inversion /
- magnetite exploration /
- Galinge deposit
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