The application of high precision gravity and magnetic survey to prospecting in coverage area:A case study of the reconnaissance of Weishan iron and copper deposit in Wuwei County
Min ZHAO, Yong SHENG, Liang-Gang QI
Anhui Institute of Geophysical and Geochemical Prospecting Techniques, Hefei 230022, China
In the coverage area, it is very difficult to carry out the conventional geological work , whereas the high-precision gravity and magnetic survey methods can quickly and effectively divide the buried faults and determine the rock boundary, which provides important assistance for prospecting in the coverage area. With the Weishan iron-copper deposit reconnaissance in Wuwei County of Anhui Province as an example, the authors divided the faults and determined rock boundary in the pre-investigation area through the processing and analysis of gravity and magnetic anomalies. Combined with geological features, two gravity and magnetic anomalies with large potential for prospecting were screened where a 40 m rich iron orebody with a TFe grade of about 52% and a mFe grade of about 38% was found by drilling. Therefore, the effectiveness of the method is confirmed, and this result also has certain guiding significance for the prospecting work in the eastern marginal coverage area of the Luzong volcanic basin where the investigation area is located.
赵敏, 盛勇, 戚良刚. 高精度重磁测量在覆盖区找矿中的应用——以无为县蔚山铁铜矿预查为例[J]. 物探与化探, 2019, 43(6): 1211-1216.
Min ZHAO, Yong SHENG, Liang-Gang QI. The application of high precision gravity and magnetic survey to prospecting in coverage area:A case study of the reconnaissance of Weishan iron and copper deposit in Wuwei County. Geophysical and Geochemical Exploration, 2019, 43(6): 1211-1216.
Xu Q D, Zhang X J, Shang H S , et al. New approach of integrated geological prospection in covered areas: A case study from northwestern Xilingguole, Inner Mongolia[J]. Earth science—Journal of China University of Geosciences, 2012,37(6):1252-1258.
Song F M, Deng Z H, Ma X J , et al. Neotectonics and Fault activity in the Anqing-Ma’anshan section of the Chang Jiang River valley[J]. Seismology and Geology, 2008,30(1):100-110.
[4]
地矿部第一综合物探大队. 安徽省庐枞盆地1∶5万物化探普查工作成果报告[R]. 1984.
[4]
The first integrated geophysical institute of Ministry of Geology and Mineral. Prospecting report for 1∶50,000 geophysical and geochemical exploration of Luzong basin of Anhui Province[R]. 1984.
[5]
安徽省地球物理地球化学勘查技术院. 安徽省区域岩石物性采测与特征分析[R]. 1986.
[5]
Anhui Institute of Geophysical and Geochemical Prospecting Techniques. Analysis on the measurement and characteristics of regional petrophysical properties in Anhui Province[R]. 1986.
Qi L G, Wang J W, Huang C Y , et al. Characteristic and geological understanding of gravity, Aeromagnetic field in Luzong area[J]. Geology of Anhui, 2008,18(4):277-281.
Zhang J S, Gao R, Li Q S , et al. Characteristics of gravity and magnetic field of Luzong volcano basin and its periphery[J]. Acta Petrologica Sinica, 2010,26(9):2613-2622.
Liu Y, Lv Q T, Yan J Y , et al. The structure of Luzong ore district and its metallogenic indication from gravity and magnetic information. Acta Petrologica Sinica, 2012,28(10):3125-3138.
Cheng F D, Liu D J, Yao R X . A study on the identification of regional and local gravity fields[J]. Computing techniques for geophysical and geochemical exploration, 1987,9(1):1-9.
Zhao Y Y, Wu Y G, Hao L B . A study on litho logic identification in shallow cover areas from aeromagnetic[J]. Computing Techniques for Geophysical and Geochemical Exploration, 2008,30(2):125-127.
Anhui, Hubei, Jiangxi, Jiangsu Bureau of Geology and Mineral Resources, Shanghai Geological Center. Metallogenic prospecting of copper-iron-sulfur-gold (polymetallic) metallogenic belts in the Middle-Lower Yangtze River—Geological and mineral characteristics, metallogenic regularity and metallogenic prediction of copper-iron-sulfur-gold (polymetallic) metallogenic belt in the Middle-Lower Yangtze River[R]. 1986.
Wu Z L, Sheng Y, Huang B , et al. Mineralization series and metallogenic regularities in the southeastern Luzong volcanic rock ore cluster area, Anhui Province[J]. East China Geology, 2017,38(3):194-202.
Zhang Y, Xu R G, Yu Y , et al. Application of high precision gravity survey in concealed fault detection[J]. Recent Developments in World Seismology, 2012,401(5):6-7.
Xie Z F, Zhang X . The application of integrated geophysical methods to the prospecting for concealed ore deposits in carbonaceous bed covering areas[J]. Geophysical and Geochemical Exploration, 2010,34(4):448-453.
Liu D J, Cheng F D . A multiple-cut method for identification of regional and local gravity fields[J]. Computing techniques for geophysical and geochemical exploration, 1997,19(1):31-35.
Liu Y, Yan J Y, Wu M A . Exploring deep concealed ore bodies based on gravity separation methods: A case study of the Nihe iron deposit[J]. Chinese Journal of Geophysics, 2012,55(12):4181-4193.
Liu Y H, Chen Z G , Ou yang Y L. The application of correspondence analysis of gravity and magnetic anomalies in xiangshan area[J]. Geophysical and Geochemical Exploration, 2008,32(6):586-589.
Ding H H, Chen X, Liu D H , et al. Characteristics of integrated 2.5D gravity and magnetism inversion profiles in the ore cluster areas in the eastern section of northern Ningwu[J]. East China Geology, 2017,38(2):138-146.
Lai Y R, Han L, Yang S S . The effects of applying high precision magnetic survey to geological mapping in Altay glacial till covering area[J]. Geophysical and Geochemical Exploration, 2014,38(6):1181-1185.
Cheng P S, Li W Q, He L C , et al. The effect of applying integrated geophysical exploration to the pre-survey of the Xiwan iron polymetallic deposit. Geophysical and Geochemical Exploration, 2013,37(6):1003-1007.
Hang N, Chen G G, Zhang J , et al. Application and study of comprehensive geophysical methods in prospecting target of iron and gopper poly-metallic ore[J]. Geophysical and Geochemical Exploration, 2016,40(5):929-934.
Fu J M, Liu Y, Song B B , et al. Study on basement structure of the Luzong basin based on gravity and magnetic multi-scale edge detection[J]. Geology and Exploration, 2012,48(5):979-990.
Zhou T F, Fan Y, Wang S W . Metallogenic regularity and metallogenic model of the middle-lower Yangtze River Valley Metallogenic Belt[J]. Acta Petrologica Sinica, 2017,33(11):3353-3372.
Du J G, Chang D Y . Consideration on the deep-iron ore deposits prospecting in the middle-lower Yangtze Metallogenic Belt[J]. Acta Geologica Sinica, 2011,85(5):687-698.
Liu X P, Chang Y F, Wu Y C . Metallogenic conditions and regularities in the middle and lower reaches of the Changjiang river[J]. Acta Geologica Sinica, 1988,62(2):167-177.