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Application of geophysical methods in the exploration of Fuxingtun silver-lead-zinc polymetallic deposit and its metallogenic mechanism |
LIANG Xin-Qiang( ), QIAO Zhan-Hua, YAN Qiang, WANG Liang, LI Jian-Feng, LIU Xiao-Hui, WANG Miao |
Land and Resources Exploration and Development Institute of Inner Mongolia, Hohhot 010020, China |
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Abstract The Fuxingtun silver-lead-zinc polymetallic deposit is the first large-scale silver-lead-zinc polymetallic deposit discovered in the Mesozoic continental volcanic basin in the Daxinganling metallogenic belt in the past two years. During the census of the deposit, geophysical methods such as high-precision magnetic survey on the ground, time-domain induced polarization method, and AMT sounding method were conducted. Geophysical methods played an important guiding role in the exploration of Fuxingtun silver-lead-zinc polymetallic deposit. ① Through the processing and interpretation of ground magnetic anomaly data (using RGIS software),the structure of the census area were determined; ② Using the characteristics of geomagnetic anomaly and apparent resistivity anomaly, combined with the exposed lithology on the surface, the caldera rifted basin was determined;③ Using the electrical sounding data, the formation process and structural characteristics of the faulted basin was determined, as well as the multi-stage of fault structure and the multi-stage of sulfide precipitation; ④ Based on the abnormal characteristics of apparent polarizability and the geological structure environment, the nature of the field source and the source of mineralization materials were determined;⑤ The intrusive body of cylindrical subvolcanic rock was delineated by AMT sounding data. Based on the above research results and drilling data, this paper studies the formation mechanism of the deposit and summarizes a set of application ideas for geophysical methods to find such deposits.
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Received: 04 June 2020
Published: 29 April 2021
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Geological map of Section 1 of the Fuxingtun silver-lead-zinc polymetallic deposit(1∶10 000)
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岩石名称 | 块数 | κ/(10-6×4πSI) | Mr/(10-3 A·m-1) | 备注 | 常见值 | 常见值变化范围 | 常见值 | 常见值变化范围 | 流纹质晶屑岩屑凝灰岩 | 31 | 1585 | 912~3981 | 912 | 347~2455 | 地表采样 | 安山质岩屑凝灰岩 | 38 | 347 | 107~1096 | 269 | 78~2138 | 流纹质晶屑凝灰岩 | 44 | 389 | 145~776 | 155 | 52~275 | 弱铅锌矿化英安质角砾凝灰岩 | 30 | 977 | 724~1413 | 191 | 83~813 | 岩心采样 | 弱铅锌矿化角砾凝灰岩 | 37 | — | — | — | — | 铅锌矿化流纹质熔结凝灰岩 | 31 | — | — | — | — | 火山角砾岩 | 30 | — | — | — | — | 石英二长斑岩 | 30 | — | — | — | — | 流纹岩 | 30 | — | — | — | — | 沉凝灰岩 | 30 | — | — | — | — | 流纹质(角砾)岩屑晶屑凝灰岩 | 35 | — | — | — | — |
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Statistics of measurements of magnetic parameters of rocks in Fuxingtun (Section 1)
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Map of RTP of ΔΤ from ground magnetic survey of Section 1 of Fuxingtun silver-lead-zinc polymetallic deposit (1∶10 000)
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Core section and side photo of drill hole ZK1304 at 580m in Section 1 of Fuxingtun silver-lead-zinc polymetallic deposit
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Contour of ground magnetic anomaly after normalized filtering and interpreted structures of Section 1 of Fuxingtun silver-lead-zinc polymetallic deposit (1∶10 000)
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岩石名称 | 块数 | η/% | ρ/(Ω·m) | 备注 | 常见值 | 常见值变化范围 | 常见值 | 常见值变化范围 | 凝灰岩 | 31 | 1.58 | 1.05~2.34 | 10000 | 2344~50119 | 地表采样 | 晶屑岩屑凝灰岩 | 30 | 1.74 | 1.45~2.34 | 8511 | 2344~72444 | 英安岩 | 32 | 1.35 | 0.76~2.00 | 5495 | 2138~18197 | 流纹岩 | 33 | 2.29 | 1.58~3.09 | 741 | 324~1445 | 岩心采样 | 铅锌矿化火山角砾岩 | 37 | 1.45 | 0.46~5.89 | 214 | 112~562 | 凝灰岩 | 44 | 2.00 | 0.69~3.89 | 661 | 219~1698 | 角砾凝灰岩 | 48 | 1.51 | 0.48~5.01 | 316 | 151~661 | 沉凝灰岩 | 30 | 0.42 | 0.20~1.10 | 115 | 62~257 | 铅锌矿化流纹岩 | 31 | 2.69 | 1.82~5.25 | 316 | 148~1023 |
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Regional electric parameters of rocks
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ρs conntour map from time-domain IP survey in Section 1 of Fuxingtun silver-lead-zinc polymetallic deposit (1∶10 000)
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ηs conntour map from time-domain IP survey in Section 1 of Fuxingtun silver-lead-zinc polymetallic deposit (1∶10 000)
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(AB/2)/m | 3 | 4.5 | 6.9 | 10 | 15 | 21 | 30 | 42 | 57 | 78 | 105 | (MN/2)/m | 1 | 1.5 | 2.3 | 3.3 | 5 | 7 | 10 | 14 | 19 | 26 | 35 | (AB/2)/m | 141 | 189 | 252 | 336 | 450 | 600 | 798 | 1050 | 1386 | 1830 | | (MN/2)m | 47 | 63 | 84 | 112 | 150 | 200 | 266 | 350 | 462 | 610 | |
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Electrode array settings for IP sounding with Wenner arrangement
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ρs and ηs conntour map of time-domain IP sounding(Wenner arrys) along profile 24 in Section 1 of Fuxingtun silver-lead-zinc polymetallic deposit (1∶5 000)
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ηs and ρs of time-domain IP and the geological section along profile P10and P11 in Section 1 of Fuxingtun silver-lead-zinc polymetallic deposit (1∶2 000)
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ρs contour map at the depth of 120 m,630 m,1 550 m and 2 050 m of AMT survey in Section 1 of Fuxingtun silver-lead-zinc polymetallic deposit (1∶5 000)
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RTP Map of ΔΤ of ground magnetic survey in Fuxingtun area, Youyi-qianqi of Kerqin (1∶50 000)
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