| 激发极化法和音频大地电磁测深在西藏斯弄多矿区找矿中的应用 |
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| 关键词:audio magnetotelluric sounding IP intermediate gradient IP sounding Sinongduo Linzizong Group Gangdise |
| 基金项目:国家重点研发计划-深地专项(编号: 2018YFC0604105);国家自然科学基金项目(编号: 41772075) |
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| The Application of Induced Polarization Method and Audio Magnetotelluric Sounding to the Exploration of the Sinongduo Deposit, Tibet |
| Located in the Nanmulin Basin of Xigaze, Tibet, the Sinongduo lead-zinc deposit was formed in the background of the India-Eurasia continental collision, where a large number of lead-zinc deposits such as Sinongduo, Narusongduo, Chazi and Zhazhalong have been discovered. These deposits have the similar host rocks and ore types, but the physical properties of the rocks and ores remain unclear because of the lack of physical work. In order to find out the geophysical characteristics of these deposits and the applicability of geophysical methods, the authors took the Sinongduo lead-zinc deposit as a study case to apply geophysical methods such as induced polarization intermediate gradient, induced polarization sounding and audio magnetotelluric sounding in exploration. Based on the comprehensive analysis of geological and geophysical data, the authors hold that the apparent chargeability of 2.5% should be the boundary between the ore and the host rocks. The location of the northern part of the main orebody destroyed by later fault was inferred in the survey area where the anomalies are strong and have high probability caused by orebody, and this conclusion was proved to be reliable according to the mineralized drill holes. In general, electrical methods exhibit high applicability in exploring the vein type and cryptoexplosive type lead-zinc deposits formed in the Linzizong volcanic rocks due to the difference in physical properties between the ore and the host rocks and can be recommended to the whole Gangdise Linzizong Group volcanic rock belt in prospecting. |
| YANG Zong-yao,ZHANG Chong-hai,ZHANG Le-jun,LANG Xing-hai,ZHAO Xiao-yan,YAN Cheng-ming.2020.The Application of Induced Polarization Method and Audio Magnetotelluric Sounding to the Exploration of the Sinongduo Deposit, Tibet[J].Acta Geoscientica Sinica,41(1):107-116. |
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