扩频激电法(SSIP)找矿效果分析——以湖南省永州市零陵区东湘桥锰矿床勘查为例  

Analysis of exploration effect of spread spectrum induced polarization(SSIP)method——Taking the exploration of Dongxiangqiao manganese deposit in Lingling district,Yongzhou City,Hunan Province as an example

作　　者：廖凤初 刘桂元 周杰 黄建权 徐军伟 陈儒军[2,3,4,5] LIAO Fengchu;LIU Guiyuan;ZHOU Jie;HUANG Jianquan;XU Junwei;CHEN Rujun(Hunan Institute of Geophysics and Geochemistry,Changsha 410116,Hunan,China;School of Geoscience and Info-Physics,Central South University,Changsha 410083,Hunan,China;AIoT Innovation and Entrepreneurship Education Center for Geology and Geophysics,Central South University,Changsha 410083,Hunan,China;Key Laboratory of Nonferrous Metal Mineralization Prediction and Geological Environment Detection of Ministry of Education,Changsha 410083,Hunan,China;Hunan Key Labora-tory of Non-ferrous Resources and Geological Disaster Exploration,Changsha 410083,Hunan,China)

机构地区：[1]湖南省地球物理地球化学调查所,湖南长沙410116 [2]中南大学地球科学与信息物理学院,湖南长沙410083 [3]中南大学AIoT(人工智能物联网)与地质地球物理创新创业教育中心,湖南长沙410083 [4]有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083 [5]有色资源与地质灾害探查湖南省重点实验室,湖南长沙410083

出　　处：《矿产勘查》2024年第9期1691-1699,共9页Mineral Exploration

基　　金：自然资源部新一轮找矿突破战略行动科技支撑项目(ZKKJ202407);湖南省地质院科研项目(HNGSTP202402)联合资助。

摘　　要：本文在充分研究勘查区地质背景的基础上,首次采用扩频激电法在祁零盆地开展锰矿资源的探测。通过双边三极测深反演结果分析,发现了一条较连续的相对高极化异常带,异常带强度与围岩相差10倍,突出而稳定;电阻率反演结果则表现为“U”型盆状高阻基底包裹低阻的特征,推测其高极化异常带由地下矿床引起;而高阻盆底包裹低阻则指示地层受向斜构造控制,与已知的向斜构造一致。经钻探勘探,发现2条较为连续的锰矿矿脉,厚0.9~2.8 m,品位9.3%~15.2%,与黄铁矿成伴生关系,一同赋存于灰岩中。通过SSIP实验成果以及钻探验证情况,得出视极化率异常与矿脉揭露深度、形态轮廓十分吻合,视电阻率异常较好地反应矿区地层展布信息,扩频激电法在碳酸锰矿产资源勘查方面的有效性得到验证。On the basis of fully studying the geological background conditions of the exploration area,this article first uses spread-spectrum induced polarization(SSIP)to explore manganese ore resources in the Qiling Basin.Through the analysis of the inversion results of SSIP sounding using the forward and inversion pole-dipole array,a relatively continuous high polarization anomaly zone was discovered,with an intensity 10 times higher than that of the surrounding rock,protruding and stable;The inversion results of apparent resistivity show the characteristic of U-shaped basin shaped high resistive basement enveloping low resistive zone,suggesting that its high polarization anomaly zone is caused by underground mineral deposit;The inclusion of high resistive basin bot⁃tom and low resistive zone indicates that the strata are controlled by syncline structures,consistent with known syncline structures.Through drilling and exploration,two relatively continuous manganese ore veins were discovered,with a thickness of 0.9 m to 2.8 m and a grade of 9.3%to 15.2%.They are associated with pyrite and coexist in limestone.Through experimental results of SSIP survey and drilling verification,it was found that the polarization anomaly is very consistent with the depth and shape of the ore vein exposure,and the resistivity anomaly reflects the distribution of the mining area strata well.Therefore,the effectiveness of the SSIP method in the exploration of manganese carbonate mineral resources is verified.

关 键 词：双边三极测深 扩频激电法 锰矿 激电异常 

分 类 号：P631[天文地球—地质矿产勘探]