地面高精度磁法在萤石矿勘查中的应用

Application of high-accuracy ground magnetic survey to the exploration of fluorite deposits

以我国东部地区中低温热液充填型萤石矿床为研究对象,区域内萤石矿主要受中生代构造-岩浆活动带控制,萤石矿成矿与中生代大规模的构造-岩浆活动尤其是燕山期中酸性岩浆活动关系密切。高精度磁测作为一种快速、经济的物探方法,通过在典型矿区及找矿靶区开展地面高精度磁测有效性试验,总结了控矿构造破碎带磁异常特征,结果表现在低值异常或正负异常分界处。该方法基本能够反映构造-矿化蚀变带的存在及其大致展布方向,为浅覆盖区及中深部非金属矿找矿提供了理论和实践依据。

The paper studied the intermediate to low-temperature hydrothermal filling fluorite deposits in eastern China.Controlled by the Mesozoic tectonic-magmatic activity zone,the fluorite deposit metallogeny is closely related to the large-scale tectonic-magmatic activity,especially the Yanshanian intermediate-acid magmatic activity.High-accuracy ground magnetic survey is a fast and economic geophysical exploration method.By testing the validity of the high-accuracy ground magnetic survey in the typical mining and prospecting target areas,the paper summarizes the magnetic anomaly characteristics of the fracture zone of the ore-controlling structure,and the result shows it is the low-value anomaly or positive-negative anomaly boundary.This method can basically reflect the existence and its general spread direction of the tectonic-mineralization erosion zone,and provides theoretical and practical basis for the shallow coverage area,the middle and deep non-metallic ore prospecting.