(1. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083；
2. 中南大學(xué) 有色金屬成礦預(yù)測教育部重點(diǎn)實(shí)驗(yàn)室，長沙 410083；
3. 長沙五維地科勘察技術(shù)有限責(zé)任公司，長沙 410205；4. 重慶市地質(zhì)勘查局 川東南地質(zhì)大隊(duì)，重慶 400038)
摘 要: 由于深埋富集鐵礦礦體的埋深超過500 m，直接運(yùn)用音頻大地電磁法(AMT法)圈定深埋富集鐵礦礦體異常的縱向分辨率難以實(shí)現(xiàn)，為此，根據(jù)礦床成因、成礦環(huán)境以及礦體賦存空間特征等地質(zhì)因素，建立地質(zhì)模型，在地質(zhì)模型的基礎(chǔ)上構(gòu)建地電模型；在地電模型的基礎(chǔ)上，應(yīng)用AMT法達(dá)到間接找礦的目的。綦江式鐵礦和寧鄉(xiāng)式鐵礦的勘查實(shí)踐結(jié)果表明，應(yīng)用AMT法能夠確定找礦標(biāo)志、含礦層次和賦礦構(gòu)造等，從而間接實(shí)現(xiàn)探測深埋富集鐵礦床。
關(guān)鍵字: 綦江式鐵礦；寧鄉(xiāng)式鐵礦；AMT法；地電模型
audio-frequency magnetotelluric method
（1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
3. Changsha 5D Geo-survey and Technical Co., Ltd., Changsha 410205, China;
4. Geological Team of Southeastern Sichuan, Chongqing Bureau of Geological Exploration and Exploitation of
Mineral Resources, Chongqing 400038, China）
Abstract:When the enrichment iron ore is buried more than 500 m, it is difficult to achieve the longitudinal resolution of iron ore abnormalities by using audio-frequency magnetotelluric (AMT) method directly. For this reason, based on the geological factors of the ore genesis, metallogenic environment, ore controlling space, and so on, the geological model was made and then the electrical model was set up, which was used to achieve the aim of indirect ore prospection by AMT method. The prospecting tests results in Qijiang-type iron deposit and Ningxiang-type iron deposit prove that the AMT method can deterimine prespecting mark, ore-bearing strata, ore-bearing structure and so on. So, indirectly detect deep-buried rich iron ore.
Key words: Qijiang-type iron deposit; Ningxiang-type iron deposit; AMT method; geoelectric model
