综合物探方法在湖南香花岭矿田三合圩矿区深部成矿规律研究中的应用

doi:10.11720/wtyht.2020.0135

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摘要

通过在香花岭矿田三合圩矿区开展地面高精度磁法快速掌握了磁异常分布特征,并推测磁异常与NE向断裂带有关,再利用可控源音频大地电磁测深对磁异常进行解析,发现中深部存在连续高阻隆起异常,推断为隐伏岩体,在此基础之上对磁异常进行了半定量反演,发现磁性体呈似层状赋存于岩体外接触带且位于低阻异常带中。利用物探推断成果选择有利部位进行钻探揭露,钻孔ZK502、ZK1601和ZK3001成功验证推断的隐伏岩体并在跳马涧组砂岩中揭露了高品位锡、铅锌多金属矿。结合钻孔、物探成果和地质背景等,对本矿区成矿规律进行了综合分析研究,建立了成矿模型,并圈定了下一步找矿靶区。利用综合物探方法对深部成矿预测具有良好效果。

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	屈利军
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关键词 ：高精度磁法, 可控源音频大地电磁测深, 深部找矿, 成矿模型

Abstract：

In this study, the surface anomaly distribution characteristics were quickly grasped by performing high-precision magnetic methods on the ground in the Sanhexu mining area of the Xianghualing orefield. Preliminary prediction anomalies are mainly caused by northeastward fault zones. The magnetic anomalies were analyzed by using CSAMT, and a continuous high-resistance uplift was found in the middle and deep parts. The anomaly is inferred to be granite. On such a basis, the authors began inversion of the magnetic anomaly, and it is found that the magnetic object is layered at the edge of the granite and is located in a low-resistance anomaly zone. According to the results of geophysical inference, the favorable metallogenic sites were selected for drilling and exposure. The boreholes ZK502, ZK1601, and ZK3001 successfully verified the inferred granite and revealed high level tin-lead-zinc polymetallic orebody in the sandstone of the Tiaomajian stratum. Based on the results of drilling, geophysical prospecting, and geological background, the authors carried out a comprehensive analysis and study of the metallogenic regularity of the mining area, established a metallogenic model, and delineated the next target for ore prospecting. The above two geophysical methods have good effects on the prediction of deep mineralization.

Key words： high precision magnetic method CSAMT deep prospecting metallogenic model

收稿日期: 2020-03-23 出版日期: 2020-12-29

P631

基金资助:中国地质调查局“全国重要矿集区找矿预测”项目(DD2016005239)

作者简介: 屈利军(1988-),男,工程师,2011年毕业于成都理工大学,主要从事地球物理勘探研究工作。Email:516124676@qq.com

引用本文:

屈利军, 王庆, 李波, 姚伟. 综合物探方法在湖南香花岭矿田三合圩矿区深部成矿规律研究中的应用[J]. 物探与化探, 2020, 44(6): 1313-1321.
QU Li-Jun, WANG Qing, LI Bo, YAO Wei. The application of multiple geophysical methods to the study of deep metallogenic regularity in the Sanhexu mining area, the Xianghualing orefield, Hunan Province. Geophysical and Geochemical Exploration, 2020, 44(6): 1313-1321.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2020.0135 或 https://www.wutanyuhuatan.com/CN/Y2020/V44/I6/1313

Fig.1 勘查区区域地质及地球物理背景
a—区域地质;b—航磁ΔT等值线平面(nT);c—剩余重力异常(mGal)

Table 1 工区不同岩石物性参数统计

Fig.2 勘查区地质情况及物探剖面布设
1—泥盆系棋梓桥组灰岩、白云岩、白云质灰岩;2—泥盆系跳马涧组二段石英砂岩、泥质粉砂岩;3—寒武系砂岩;4—地质界线;5—断裂;6—铁锰帽;7—钻孔位置;8—物探剖面;9—采矿权范围

Fig.3 勘查区高精度磁法推断成果

Fig.4 10线综合物探推断成果

Fig.5 16线综合物探推断成果

Fig.6 20线综合物探推断成果

Fig.7 ZK3001钻孔地质剖面

Fig.8 矿体与地层、岩体的空间位置关系

Fig.9 成矿预测模型
1—泥盆系余田桥组;2—泥盆系棋梓桥组;3—泥盆系跳马涧组;4—地质界线;5—断层;6—矿化界线;7—花岗岩;8—云英岩化、钾化Nb、Y带;9—云英岩化、硫化W、Sn带;10—透闪石化、绿泥石化Sn、Pb、Zn带;11—黄铁矿化、碳酸盐化Pb、Zn带;12—碳酸盐化F、Hg带;13—Pb、Zn矿体;14—Sn、Pb、Zn矿体;15—W、Sn矿体

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