寒区浅覆盖萤石矿高磁-低阻地球物理标志与找矿预测

    High-magnetic and low-resistivity geophysical signatures and prospecting prediction for shallow-covered fluorite deposits in periglacial regions

    • 摘要: 萤石为战略性非金属矿产,供需缺口持续扩大。漠河红旗林场萤石矿属中低温热液-断裂控矿-热液交代型,与中生代火山岩浆活动密切相关,矿体产出受构造严格控制,矿体赋存于断裂破碎带。针对红旗林场寒区浅覆盖萤石矿隐蔽性强的特点,综合运用磁法、电法等地球物理勘探技术,结合区域及勘查区地质背景开展研究。研究结果表明,浅覆盖区萤石矿体呈高磁性异常、低视电阻率特征,物探异常区解译精度定位误差≤15 m,进一步结合实际槽探,预测验证成功率达到三条探槽中两条见矿(验证率66.7%)。基于地质、地球物理等多源数据构建萤石矿综合找矿三重验证预测流程。研究证实,多方法协同的地球物理勘探技术可有效指导寒区浅覆盖区和深部萤石矿勘查,为同类矿床找矿提供技术参考。本文为公益性区域地质矿产调查项目成果,属于技术方法与地质矿产勘查交叉研究。

       

      Abstract: Fluorite is a strategic non-metallic mineral resource, and the supply-demand gap continues to widen. The Hongqi Forest Farm Fluorite Mine in Mohe belongs to the medium-low temperature hydrothermal-fault-controlled-hydrothermal metasomatic type, which is closely related to Mesozoic volcanic magmatic activities. The orebody occurrence is strictly controlled by structures and is hosted in fault breccia zones. Aiming at the strong concealment of the periglacial region shallow-covered fluorite orebody in Hongqi Forest Farm, geophysical exploration technologies such as magnetic method and electrical method are comprehensively applied, combined with regional and exploration area geological background for research. The results show that the fluorite orebody in the shallow-covered area presents high magnetic anomaly and low apparent resistivity characteristics. The interpretation accuracy of geophysical anomalies has a positioning error ≤15 m. Further combined with actual trenching, the prediction and verification success rate reaches 2 out of 3 trenches (verification rate 66.7%). Based on multi-source data such as geology and geophysics, a comprehensive fluorite mineralization three-dimensional verification prediction process is constructed. The study confirms that the synergistic geophysical exploration technology with multiple methods can effectively guide the exploration of fluorite in periglacial region shallow-covered areas and deep areas, providing technical reference for the mineralization of similar deposits. This paper is the achievement of a public welfare regional geological mineral resource survey project, belonging to the interdisciplinary research of technical methods and geological mineral resource exploration.

       

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