物探与化探2026，Vol.50Issue(3)：458-468,11.DOI:10.11720/wtyht.2026.1094
音频大地电磁法对冀东某隐伏斑岩型钼多金属矿床指示作用研究
Audio magnetotelluric method:Implications for a concealed porphyry-hosted molybdenum-polymetallic deposit in eastern Hebei province
摘要
Abstract
Polymetallic deposits,primarily porphyry-related polymetallic deposits,are hosted in eastern Hebei province in the northern margin of the North China Block.The study area,located in northeastern Chengde,is a typical rhyolite porphyry-hosted molybdenum-polymetallic deposit.Within this area,cryptoexplosive breccias,rhyolites,and the Archean biotite amphibole plagiogneisses are exposed on the surface.Based on previous data,it is speculated that the ore-bearing rhyolite porphyries occur beneath the cryptoexplosive brec-cias,with a burial depth generally exceeding 500 m.However,the deep-seated molybdenum-polymetallic deposits can barely be accu-rately located with traditional geophysical methods.Therefore,this paper used the audio magnetotelluric(AMT)method for the first time to locate the concealed porphyry-hosted molybdenum-polymetallic deposits in this area.Based on the low-resistivity characteristic of the molybdenum-polymetallic ores,and with 1 000 Ω·m as the upper limit,the range of low-resistivity anomalies was delineated in the deep strata of the study area.Then,combining the geological metallogenic patterns in the study area,this study tried to locate the deep-seated concealed molybdenum-polymetallic deposits based on low-resistivity anomalies.According to the speculated favorable metallogenic po-sitions of molybdenum polymetallic ore bodies,two boreholes were drilled for verification.An industrial-grade molybdenum ore body with a thickness of 504 m was discovered deep in No.1 borehole,while a molybdenum ore body with a thickness of 185 m and a lead-zinc ore body with a thickness of 200 m were discovered at depth in No.2 borehole,successfully predicting the positions.Moreover,based on the resistivity distribution revealed by AMT,a three-dimensional geophysical model was established for the exploration of por-phyry-hosted molybdenum-polymetallic deposits in this area.This model provides a new geophysical approach for locating deep-seated concealed porphyry-hosted molybdenum-polymetallic deposits.关键词
隐伏斑岩型钼多金属矿床/音频大地电磁法(AMT)/低阻异常/三维找矿模型Key words
concealed porphyry-hosted molybdenum-polymetallic deposit/audio magnetotelluric(AMT)method/low-resistivity anomaly/three-dimensional model for mineral exploration分类
天文与地球科学引用本文复制引用
杨磊,赵向奎,王晓东,张立剑,苗群峰,于浩,付荣钦..音频大地电磁法对冀东某隐伏斑岩型钼多金属矿床指示作用研究[J].物探与化探,2026,50(3):458-468,11.基金项目
河北省地质勘查基金项目冀北矿集区成矿机理研究项目(13000025P003294103391) （13000025P003294103391）
