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| Application of gamma-ray spectrum method in the exploration of fluorite deposits in southern Anhui Province, China |
| LIAN Xiang-Yu1,2, LUO Jian-Bing1,2 |
1. Anhui Nuclear Exploration Technology Central Institute, Wuhu 241000, China
2. Radioactive Resources and Environmental Engineering Research Center of Anhui Bureau of Geology and Mineral Resources, Wuhu 241000, China |
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Abstract This study conducted a profile spectrum survey in the southern Anhui Province using a portable gamma-ray spectrometer. Based on the differences in types and quantities of natural radioactive elements present in geological bodies, this study compared the stack plots of the characteristic parameters of U, Th, and K with geologic-topographic maps to further delineate the occurrence locations of ore bodies. Additionally, this study investigated the applicability of gamma-ray spectra to the exploration of fluorite deposits and provided empirical suggestions for parameter surveys and anomaly determination. The experimental results indicate that gamma-ray energy spectroscopy applies the exploration of fluorite minerals. Notably, Th can be used as a primary indicator, exhibiting low-amplitude anomalies, which correspond well with ore bodies. Besides, this element is applicable to other surrounding rock conditions. The analysis and verification from the perspective of environmental protection revealed that the gamma-ray radiation dose rates induced by fluorite vein ore bodies are far lower than their background values and can be used as a preliminary basis for ore prospecting.
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Received: 12 April 2024
Published: 22 July 2025
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γ Spectral measurement profile of line 1
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γ Spectral measurement profile of line 2
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| 岩石 | w(K)/% | w(U)/10-6 | w(Th)/10-6 | 备注 | | 范围 | 平均值 | 范围 | 平均值 | 范围 | 平均值 | | 萤石矿石 | 0.7 ~ 1.3 | 1.1 | 0.8 ~ 2.1 | 1.7 | 0.7 ~ 4.3 | 3.3 | | | 花岗闪长岩 | 1.6 ~ 3.0 | 2.2 | 2.6 ~ 5.4 | 3.8 | 8.3 ~ 12.2 | 9.2 | | | 地表覆盖层(土壤) | 1.7 ~ 3.4 | 2.4 | 2.2 ~ 4.7 | 3.2 | 7.9 ~ 12.8 | 9.7 | | | 砂板岩[10] | 1.6 ~ 2.4 | 1.9 | 1.5 ~ 2.5 | 2.1 | 4.9 ~ 8.5 | 7.0 | | | 黄土或亚黏土[10] | 2.2 ~ 2.7 | 2.3 | 1.6 ~ 3.3 | 2.4 | 7.2 ~ 10.8 | 8.8 | | | 灰岩[11] | 2.8 ~ 4.9 | 3.6 | 2.8 ~ 5.5 | 3.9 | 14.8 ~ 54.7 | 28.5 | | | 酸性喷出岩[12] | 1.0 ~ 6.2 | 3.1 | 0.8 ~ 16.4 | 4.1 | 1.1 ~ 41.0 | 11.9 | | | 酸性侵入岩[12] | 0.1 ~ 7.6 | 3.1 | 0.1 ~ 30.0 | 4.1 | 0.1 ~ 253.1 | 25.7 | | | 中性侵入岩[12] | 0.1 ~ 6.2 | 2.1 | 0.1 ~ 23.4 | 3.2 | 6.4 ~ 106.0 | 12.2 | | | 化学沉积岩[12] | 0.02 ~ 8.4 | 0.6 | 0.0 ~ 26.7 | 3.6 | 0.03 ~ 132.0 | 14.9 | 包含碳酸盐岩 | | 碎屑沉积岩[12] | 0.01 ~ 9.7 | 1.5 | 0.1 ~ 80.0 | 4.8 | 0.22 ~ 362.0 | 12.4 | | | 变质火成岩[12] | 0.1 ~ 6.1 | 2.5 | 0.1 ~ 148.5 | 4.0 | 0.11 ~ 104.2 | 14.8 | | | 变质沉积岩[12] | 0.01 ~ 5.3 | 2.1 | 0.1 ~ 53.4 | 3.0 | 0.11 ~ 91.4 | 12.0 | |
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Statistical of U, Th and K measurement values for different geological bodies
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| 测量位置 | 40K比活度/
(Bq·kg-1) | 238U比活度/
(Bq·kg-1) | 232Th比活度/
(Bq·kg-1) | 备注 | 1号线萤石
脉矿附近 | 158.5 | 19.7 | 10.5 | 异常点附近取样测量 | | 167.4 | 20.8 | 11.3 | | 152.2 | 18.5 | 11.0 | | 183.4 | 22.4 | 12.5 | | 194.2 | 24.6 | 12.1 | 2号线石英
脉附近 | 221.9 | 17.2 | 2.8 | | 249.5 | 19.7 | 2.9 | | 237.8 | 18.9 | 3.0 | | 204.7 | 15.3 | 2.8 | | 261.2 | 20.1 | 3.6 | | 无异常点位 | 887.6 | 40.7 | 33.6 | |
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Statistics of gamma energy spectral measurements of fluorite vein mines
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