音频大地电磁法在羊场超大型隐伏磷矿勘查中的应用  

Application of Audio Magnetotelluric Method in the Exploration of Large-scale Hidden Phosphate Ore in Yangchang

作　　者：李忠 白兵 黄钊 张有荣 米云川 张蓉 汪金明 LI Zhong;BAI Bing;HUANG Zhao;ZHANG Yourong;MI Yunchuan;ZHANG Rong;WANG Jinming(Yunnan Geological Survey(Yunnan Academy of Geological Sciences),Kunming,Yunnan 650216;Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization,Ministry of Natural Resources,Kunming,Yunnan 650051;Yunnan Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization,Kunming,Yunnan 650051)

机构地区：[1]云南省地质调查院(云南省地质科学研究院),云南昆明650216 [2]自然资源部三江成矿作用及资源勘查利用重点实验室,云南昆明650051 [3]云南省三江成矿作用及资源勘查利用重点实验室,云南昆明650051

出　　处：《地球学报》2025年第2期449-455,共7页Acta Geoscientica Sinica

基　　金：云南省地质勘查基金项目“镇雄县羊场磷矿沉积环境及成矿机制研究”和“云南省镇雄县羊场磷矿区高寨-柏香坝磷矿普查”(编号:Y202301,SJ(2024)KY003,K202301)资助。

摘　　要：依据羊场磷矿区地质特征和物性(电性)特征,运用音频大地电磁法对矿区进行探测分析,自地表至深部划分了五个电性层及相应地层和构造;推测隐伏含矿层位在背斜核部隆起,沿两翼缓慢向深部延伸,总体呈马鞍状展布,磷矿层厚度在40~80 m之间,最浅约500 m,最深约1500 m。经钻探工程揭露在深部发现超大型磷矿,音频大地电磁法在本区取得良好应用效果。研究结果表明,音频大地电磁法是探测同类型隐伏磷矿的有效地球物理方法。The audio-frequency magnetotelluric method was used to explore and analyze the geological and physical(electrical)characteristics of the Yangchang phosphate mining area.Five electrical layers along with their corresponding strata and structures were identified from the surface to the depth.It was hypothesized that the concealed ore-bearing layer is uplifted in the core of the anticline,gradually extending deeper along the two flanks,generally exhibiting a saddle-shaped distribution.The thickness of the phosphate ore layer was between 40 m and 80 m,with the shallowest depth of approximately 500 m and the deepest depth of approximately 1500 m.This drilling project has revealed the presence of extensive phosphate deposits in deep areas,and the audio frequency magnetotelluric method has yielded promising results in this region.These research findings indicate that the audio magnetotelluric method is an effective geophysical method for detecting concealed phosphate deposits of similar types.

关 键 词：音频大地电磁法 隐伏磷矿 电性 羊场背斜 

分 类 号：P631.325[天文地球—地质矿产勘探] P619.2[天文地球—地质学]