Fine interpretation of magnetic data for a concealed mineral deposit: A case study of the Fe-polymetallic deposit from Western China

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-07-23 DOI:10.1016/j.jappgeo.2024.105468
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Abstract

We interpret the magnetic anomalies for exploration and characterization of the Galinge iron polymetallic deposit, which is the largest iron polymetallic deposit in Western China. This undeveloped deposit is completely concealed by the thick Quaternary sediments, presenting an exploration challenge. A lot of drillholes have been implemented focusing on the strong magnetic anomaly centers, while the relationship between magnetite-bearing and non-magnetite-bearing drillholes is unclear, and the metallogenic regularity in the whole area needs to be further studied. The edge detection is applied on the downward continued field to resolve individual magnetite ore bodies and enhance possible concealed ore bodies. Three anomaly belts trending NE-SW with a total extension length of ∼11 km are first revealed. Combining the sharper images from the enhanced magnetic anomaly and the drillholes, we infer that the deposits would be related to the syncline structure. Forward modeling confirms the inferred three belts of the ore bodies and also shows possibly two layers deposits in which the deep layer would be located at a depth of ∼1000 m. Although the deeper deposit results in a very smooth and low amplitude magnetic anomaly, the forward modeling shows that the anomalies from both the shallow magnetite and the inferred deep one fit the observed anomaly better. One deep drillhole reveals the fact that the magnetite is existed at a depth of ∼1000 m which highlights the interpretation of the deep deposit. The results show the contribution of the fine processing techniques which would be used to distinguish zones of potentially concealed mineralization.

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隐蔽矿床磁数据的精细解读:中国西部铁多金属矿床案例研究
我们对磁异常进行了解释,以便对中国西部最大的铁多金属矿床--嘎林格铁多金属矿床进行勘探和定性。这个尚未开发的矿床完全被厚厚的第四纪沉积物所掩盖,给勘探工作带来了挑战。目前已围绕强磁异常中心实施了大量钻探,但含磁铁矿钻孔与不含磁铁矿钻孔之间的关系尚不清楚,整个区域的成矿规律性有待进一步研究。在向下持续场上应用边缘检测,以分辨单个磁铁矿体,并增强可能的隐蔽矿体。首先发现了三条东北-西南走向的异常带,总延伸长度为 11 千米。结合增强磁异常和钻孔的更清晰图像,我们推断这些矿床与切斜构造有关。正演模型证实了推断的三条矿体带,并显示可能有两层矿床,其中深层矿床位于 1000 米深处。虽然较深的矿床会产生非常平滑且振幅较低的磁异常,但正演模型显示,浅层磁铁矿和推断的深层矿床的异常更符合观测到的异常。一个深钻孔揭示了磁铁矿存在于 1000 米深处的事实,这突出了对深矿床的解释。这些结果表明了精细加工技术的作用,该技术可用于区分潜在的隐蔽矿化区。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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