[Objective]The aim of this study is to characterize the deep electrical structure of the Baishawo pegmatite-type deposits,explore the spatial distribution of rare metal mineralization models and ore-conferring carriers,and elucidate the relationship between the location of ore veins to provide a basis for prediction in rare metal mineral exploration.[Methods]Through the controlled-source audio-geomagnetic method(CSAMT)and the conjugate gradient method of inverse measurement of three exploration profiles,deep hidden rock(ore)bodies were detected.Then,by combining these results with the information from drill holes and elemental geochemical anomalies,a comprehensive analysis was carried out to reveal the distribution of the hidden dikes and the mineralization characteristics.[Results]The study showed that the concealed pegmatite veins are mainly located in the Lengjiaxi Group,where they are concentrated on the top of the granite body and around tectonic fissures and have burial depths ranging from 50 to 300 m.The geophysical signature of pegmatite vein mineralization is a high-resistance vein-like geologic body intruded from a deep high-resistance body into a shallow low-resistance body.[Conclusion]The determined distribution and burial depth of concealed pegmatite veins,identified potential concealed veins in the study area,and geophysical characteristics of the pegmatite vein mineralization provide a basis for understanding the formation mechanism of fracture zone-constrained pegmatite veins.Significance The research results provide a scientific basis for follow-up exploration of the Baishawo deposit,reveal the formation mechanism of the pegmatite veins,and provide reliable physical exploration and prediction technology and experience useful for rare metal exploration in northeast Hunan and south China.
关键词
伟晶岩/连云山/CSAMT/锂-铍-铌-钽矿床/稀有金属
Key words
pegmatite/Lianyunshan mountain/CSAMT/lithium-beryllium-niobium-tantalum deposit/rare metal
维普
万方数据