首页|音频大地电磁法在四川容须卡稀有金属矿勘查中的应用——以No.6号伟晶岩脉为例

音频大地电磁法在四川容须卡稀有金属矿勘查中的应用——以No.6号伟晶岩脉为例

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在四川容须卡稀有金属矿区,为了进一步了解伟晶岩脉深部形态、产状变化特征,选取地表形态、产状变化较大的No.6伟晶岩脉,垂直其地表走向按线距40m、点距10～20 m开展了3条音频大地电磁测深测剖面测量.经综合解释,剖面上M11、M12、M21 M22、M23异常带空间位置存在连续性,且形态与地表探槽揭露的伟晶岩脉膨大、分支现象吻合,异常形态反显示伟晶岩脉深部产状向西侧伏,延伸至100～200 m可能尖灭;M13与原生晕测量预测的隐伏伟晶岩脉吻合.采用PD1、PD1-CM1坑道进行验证,揭露出伟晶岩脉厚11.6 m,产状268°∠ 83°,取样分析Li2O品位0.866％～1.32％,BeO品位0.046％～0.07％.证明音频大地电磁测深方法在容须卡地区寻找隐伏伟晶岩脉的有效性.
The Application of Audio-frequency Magnetotelluric Method in the Exploration of Rongxuka Raremetal Mining Are in Sichuan Province-Taking the No.6 Pegmatite Vein as an Example
In order to further understand the characteristics of the deep morphology and occurrence of the pegmatite veinsin the Rongxuka Raremetal Mining Are in Sichuan Province,the No.6 pegmatite vein with great changes in surface morphology and occurrence was selected,and 3 audio magnetotelluric sounding profiles were carried out vertically according to the line distance of 40m and the point distance of 10-20m.After comprehensive interpretation,the spatial position of the anomaly zones M11,M12,M21,M22 and M23 on the profile is continuous,and the morphology is consistent with the expansion and branching phenomenon of pegmatite veins revealed by the surface exploration trough.The abnormal morphology shows that the deep occurrence of pegmatite veins is westward,extending to 100m～200m and may be pinched out.M13 is consistent with the concealed pegmatite veins predicted by primary halo measurement.PD1 and PD1-CM1 tunnels were used for verification,revealing that the pegmatite vein was 11.6m thick and its occurrence was 268°∠83°.The sampling analysis showed that the Li2O grade was 0.866％～1.32％and the BeO grade was 0.046％～0.07％.It is proved that the audio magnetotelluricmethod is effective in finding concealed pegmatite veins in Rongxuka area.

Audio-frequency magnetotelluric methoddeep prospectingpegmatitelithium oreRongxuka

杨元良、廖兴健、郭建强、宋祥峰、王章翔、张人栖、王喻

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四川省第三地质大队,成都 610057

四川省地质局郭建强稀有金属深部找矿创新工作室,成都 611743

音频大地电磁法 深部找矿 伟晶岩 锂矿 容须卡

四川省科技厅科技项目四川省地矿局科技项目四川省地质勘查基金四川省地质勘查基金四川省政府性投资地质勘查项目

2023NSFSC0793SCDKKJXM-201901川国土资函[2013]895号川国土资函[2017]107号川自然资[2023]324号

2024

10.3969/j.issn.1006-0995.2024.01.024

四川地质学报
四川省地质学会

四川地质学报

影响因子：0.314
ISSN：1006-0995
年,卷(期)：2024.44(1)
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