(1. 江西省地质局物化探大队，南昌 330002；
2. 中南大学 地球科学与信息物理学院，长沙 410083；
3. 湖南继善高科技有限公司，长沙 410208)
摘 要: 朱溪钨铜矿是近年发现的超大型矽卡岩型钨铜矿床，刷新了钨矿资源量的世界纪录，主矿体埋深普遍超过1000 m。2017年，矿体在倾向和走向上没有完全封闭，主要控岩控矿构造的深部产状未知，亟需开展深部探测工作。本研究尝试将广域电磁法应用到朱溪矿区深部探测；利用物性资料和井旁视电阻率测深曲线建立了目标地质体电性、密度、磁性与岩性之间的联系；开展了重磁电多参数对比分析，结合已知地质资料绘制了骨干剖面的二维地质-地球物理断面，依据广域电磁法反演断面拟三维切片图构建了三维地质找矿模型。结果表明：这些工作较好地揭示了区内主控岩控矿构造、赋矿层位的展布形态，获取了与深部隐伏岩体有关的热液蚀变活动信息。广域电磁法为朱溪矿区深部500~3000 m“第二找矿空间”的成矿规律研究、下一步找矿方向等提供了有力依据，是金属矿产深部找矿的有效方法技术。
关键字: 朱溪钨铜矿；广域电磁法；矽卡岩；深部探测
（1. Geophysical & Geochemical Exploration Brigade of Jiangxi, Nanchang 330002, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Hunan Geosun High-Tech Co., Ltd., Changsha 410208, China）
Abstract:The Zhuxi W-Cu polymetallic deposit in Jiangxi Province, China, is a super large-scale skarn deposit, sets the new world record of tungsten mineral resources in recent years. The burial depth of the main orebodies commonly exceeds 1000 m. Because of the lack of deep exploration, until 2017, the orebodies along the dip and strike direction were not closed completely, and the main rock-control and ore-control structures were not known. The deep exploration was urgently needed. The wide field electromagnetic method was applied for deep exploration. The logical relationships between the resistivity, density, magnetic and lithology of the target geologic body have been established, based on the characteristics of the property data and the sounding resistivity near by the drill. The authors then made a comprehensive study by multiparameter mutual constraint with fine processing and interpretation of gravity, magnetic and electric, compared with known geologic data, drew the 2D geological-geophysical section of the backbone profile. And the 3D geological ore-prospecting model has been set up by wide field electromagnetic inversion sections. The results show that those works clearly reveal the distributed shape of the main rock-control and ore-control structures and the main ore-bearing stratum. The magma hydrothermal alteration which relates to concealed Yanshanian intrusive rocks in deep is acquired. The experimental results are references for the 500-3000 m deep-seated second mineralization location’s metallogenic regularity and the further geological prospecting direction of Zhuxi W-Cu polymetallic deposit, and show that the wide field electromagnetic method is an effective method for deep exploration.
Key words: Zhuxi W-Cu deposit; wide field electromagnetic method; skarn; deep exploration
