Enrichment Mechanism of Rare Earth Elements in the Aluminum-bearing Rock Series of the Jinsha Area in Northwest Guizhou Province
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摘要:
黔西北金沙地区下石炭统九架炉组含铝岩系中稀土元素含量较高，具有一定勘探潜力。本文通过野外剖面测量、探槽编录、岩心编录、镜下鉴定、主微量、稀土元素化学分析等方法，研究含铝岩系中稀土元素富集机制，得出：黔西北金沙地区含铝岩系中ΣREE含量较高，在156.30×10-6～1 543.70×10-6之间，平均为743.49 ×10-6，轻稀土相对富集，ΣLREE/ΣHREE值在2.20～10.69之间。含铝岩系中稀土元素的富集受黏土矿物含量、含铁矿物等多种因素共同影响，轻稀土在碱性条件下水解率较高易富集，氧化环境下有利于REE3+的沉积，土状铝土矿沉积水体呈弱碱性，沉积环境为氧化环境，为稀土元素的富集提供了良好的富集条件，钻孔ZK01底部高铁土状铝土矿中稀土元素含量在0.115%～0.150%，指示金沙地区含铝岩系中稀土元素具有较大勘探潜力。
Abstract:The rare earth element (REE) content in the aluminum-bearing rock series of the Lower Carboniferous Jiujialu Formation in the Jinsha Area of northwest Guizhou is relatively high, showing certain exploration potential. This paper studies the enrichment mechanism of REE in the aluminum-bearing rock series through field profile measurement, trench logging, core logging, microscopic identification, major and trace element, and REE chemical analysis. The results show that the ΣREE content in the aluminum-bearing rock series of the Jinsha Area in northwest Guizhou is relatively high, ranging from 156.31×10-6 to 1 543.70×10-6, with an average of 743.49×10-6. Light rare earth elements are relatively enriched, and the ΣLREE/ΣHREE value ranges from 2.20 to 10.69. The enrichment of REE in the aluminum-bearing rock series is influenced by multiple factors such as the content of clay minerals and iron-bearing minerals. Light rare earth elements have a higher hydrolysis rate at alkaline conditions and are easily enriched. An oxidized environment is conducive to the deposition of REE3+. The water body of the limonitic bauxite in the Jinsha Area is weakly alkaline, and the sedimentary environment is oxidized, providing favorable conditions for the enrichment of REE. The REE content in the high-iron limonitic bauxite at the bottom of borehole ZK01 ranges from 0.115% to 0.150%, indicating that the aluminum-bearing rock series in the Jinsha Area has great exploration potential for REE.
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Key words:
- southwest Guizhou /
- Jiujialu Formation /
- aluminous rock series /
- enrichment mechanism /
- geoscience
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表 1 黔西北金沙地区含铝岩系及底板岩石化学分析数据
Table 1. Chemical analysis data of aluminous rock series and basement rocks in Jinsha Area, northwest Guizhou Province
样品编号 岩性 SiO2 Al2O3 Fe2O3 FeO Cu Sr Ba V Zr U Th Sr/Cu V/Zr Sr/Ba Tu/U /×10-2 /×10-2 /×10-2 /×10-2 /×10-6 /×10-6 /×10-6 /×10-6 /×10-6 /×10-6 /×10-6 PM101-H1 灰色微晶灰岩 25.69 1.99 1.01 0.56 4.32 92.6 33.2 18.1 36.6 0.84 2.50 21.44 0.49 2.79 2.98 PM101-H2 土状铝土矿 40.50 24.03 13.3 0.45 117.00 203.0 236.0 120.0 113.0 9.97 22.80 1.74 1.06 0.86 2.29 PM101-H3 土状铝土矿 45.30 32.61 2.11 0.14 20.40 710.0 374.0 139.0 128.0 4.81 28.30 34.80 1.09 1.90 5.88 PM101-H4 鲕粒状铝土矿 33.50 46.65 0.55 0.38 9.63 133.0 167.0 248.0 666.0 9.43 53.20 13.81 0.37 0.80 5.64 TC101-H1 灰色微晶灰岩 58.94 12.97 5.64 8.38 14.10 62.5 94.7 90.0 654.0 3.84 14.20 4.43 0.14 0.66 3.70 TC101-H2 土状铝土矿 41.80 25.55 8.30 5.57 45.60 285.0 254.0 156.0 243.0 7.07 29.00 6.25 0.64 1.12 4.10 TC101-H3 土状铝土矿 45.20 34.06 1.59 0.91 63.60 521.0 300.0 163.0 144.0 5.60 28.40 8.19 1.13 1.74 5.07 TC101-H4 鲕粒状铝土矿 26.10 52.92 1.56 0.49 8.60 108.0 87.4 163.0 715.0 10.90 51.80 12.56 0.23 1.24 4.75 TC101-H5 鲕粒状铝土矿 32.80 40.14 4.91 0.40 16.60 74.1 354.0 349.0 950.0 11.10 75.20 4.46 0.37 0.21 6.77 PM102-H1 灰色微晶灰岩 22.03 7.49 1.89 0.18 16.30 112.0 217.0 54.7 55.1 3.37 5.73 6.87 0.99 0.52 1.70 PM102-H3 土状铝土矿 44.40 34.07 3.95 0.14 25.40 517.0 557.0 143.0 132.0 3.42 27.80 20.35 1.08 0.93 8.13 PM102-H5 鲕粒状铝土矿 61.80 16.94 4.08 2.25 8.17 198.0 338.0 93.2 231.0 4.23 20.30 24.24 0.40 0.59 4.80 PM102-H6 鲕粒状铝土矿 39.20 29.12 4.04 2.08 31.10 7 420.0 1 610.0 154.0 305.0 11.20 33.70 238.59 0.50 4.61 3.01 ZK01-H1 灰色微晶灰岩 10.26 2.49 2.46 1.99 2.45 196.0 43.6 34.9 83.6 2.07 3.61 80.00 0.42 4.50 1.74 ZK01-H2 土状铝土矿 47.30 16.46 2.45 19.44 70.90 1 100.0 129.0 116.0 134.0 6.74 39.20 15.52 0.87 8.53 5.82 ZK01-H3 土状铝土矿 27.50 8.57 14.60 27.94 78.70 659.0 35.9 108.0 127.0 3.05 15.50 8.37 0.85 18.36 5.08 ZK01-H4 土状铝土矿 46.20 29.75 2.32 3.32 23.00 441.0 294.0 140.0 132.0 3.66 24.00 19.17 1.06 1.50 6.56 ZK01-H5 鲕粒状铝土矿 38.40 41.16 1.75 0.32 9.92 154.0 258.0 174.0 315.0 4.19 33.70 15.52 0.55 0.60 8.04 ZK01-H6 鲕粒状铝土矿 32.30 43.79 2.04 0.64 4.76 82.5 185.0 242.0 611.0 6.20 30.50 17.33 0.40 0.45 4.92 
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表 2 黔西北金沙地区含铝岩系及底板稀土元素含量 单位：g/t
Table 2. Content of rare earth elements in the aluminous rock series and the floor of Jinsha Area in northwest Guizhou
样品编号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ΣREE ΣLREE ΣHREE PM101-H1 6.17 12.9 1.80 7.98 1.36 0.27 1.44 0.29 1.23 0.38 0.68 0.14 0.75 0.15 6.42 41.96 30.48 11.48 PM101-H9 75.60 147.0 17.80 79.90 17.50 2.89 15.20 1.79 6.76 1.71 3.27 0.68 3.48 0.69 24.80 422.17 340.69 81.48 PM101-H10 290.00 592.0 82.60 322.00 41.40 6.97 37.20 6.05 24.70 5.83 10.80 2.40 11.20 2.24 77.00 1 543.70 1 334.97 208.72 PM101-H11 25.80 44.9 4.78 17.40 2.74 0.65 3.10 0.67 3.42 1.01 2.26 0.59 3.17 0.62 18.00 156.31 96.27 60.04 TC101-H1 36.90 58.0 6.61 22.60 2.49 0.41 2.76 0.50 2.28 0.68 1.53 0.39 2.13 0.41 11.10 149.00 127.00 21.78 TC101-H5 95.80 187.0 22.00 92.40 15.20 2.61 13.90 2.33 9.93 2.61 4.82 1.07 6.07 1.07 42.40 525.41 415.01 110.40 TC101-H6 128.00 228.0 25.20 93.80 17.40 3.37 16.40 2.62 10.50 2.19 3.91 0.75 3.61 0.67 27.60 604.32 495.77 108.55 TC101-H8 15.90 26.6 2.93 11.10 1.95 0.46 2.43 0.61 3.56 1.20 2.58 0.70 3.73 0.77 19.50 116.42 58.94 57.48 TC101-H9 8.10 15.3 1.90 8.11 2.04 0.52 2.71 0.79 4.62 1.57 3.20 0.82 4.52 0.84 24.30 108.14 35.97 72.17 PM102-H1 14.50 20.3 2.43 9.35 1.60 0.35 1.56 0.29 1.25 0.34 0.71 0.20 0.87 0.18 6.13 60.06 48.53 11.53 PM102-H3 315.00 318.0 50.30 207.00 22.60 3.95 19.20 2.27 7.31 1.50 2.84 0.51 2.90 0.54 18.70 1 002.60 916.85 85.77 PM102-H5 57.00 117.0 13.90 55.90 10.30 1.88 11.50 1.75 7.93 2.59 4.09 1.08 5.14 0.97 32.70 341.03 255.98 85.05 PM102-H6 226.00 443.0 47.50 225.00 41.90 11.20 64.70 14.40 60.40 14.70 24.00 5.18 24.20 3.52 206.00 1 441.10 994.60 446.50 ZK01-H1 10.40 24.2 2.78 10.00 2.19 0.52 2.40 0.48 3.15 0.70 1.58 0.27 1.94 0.31 18.50 79.42 50.09 29.33 ZK01-H4 146.00 414.0 51.80 304.00 78.80 12.80 42.80 5.82 33.40 6.32 14.20 1.90 11.00 1.57 129.00 1 369.40 1 007.4 362.01 ZK01-H5 138.00 460.0 73.40 454.00 72.90 11.80 42.20 5.64 29.20 5.69 13.70 1.69 9.30 1.23 83.80 1 510.60 1 210.10 300.45 ZK01-H6 200.00 433.0 53.70 223.00 29.50 4.03 17.30 2.20 10.40 1.82 4.52 0.51 3.53 0.58 25.70 1 149.80 943.23 206.56 ZK01-H8 31.30 42.9 4.35 12.00 2.02 0.54 2.28 0.52 2.52 0.67 1.74 0.37 2.33 0.31 12.80 290.65 93.11 197.54 ZK01-H9 59.10 131.0 14.00 57.80 8.14 1.41 5.50 1.00 7.66 1.92 4.64 0.82 4.99 0.73 30.00 570.71 271.45 299.26
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