Geochemical characteristics and sedimentary environment of coal during Middle Jurassic in Yima Basin
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摘要:
为研究华北板块西南缘中侏罗世煤层地球化学特征及其沉积环境，以义马盆地中侏罗世义马组2-3号煤层为研究对象，借助X射线荧光光谱仪、等离子体质谱仪等手段，运用地球化学理论和方法，详细研究了煤中地球化学特征及其所反映的沉积环境。研究结果表明：研究区常量元素含量与中国煤相比，SiO2、P2O5和K2O显著偏高，而Al2O3含量较低；微量元素中Cs富集，Sb、Nb、Ta、Zr、Hf亏损；稀土元素整体为轻微富集，δEu负异常，而δCe正异常，表明采样煤层未受岩浆、热液、海水影响，物源主要是陆源碎屑；Th/U、V/ (V+Ni）、Ce异常、Sr/Cu及气候指数分析表明，采样煤层古泥炭堆积于还原环境，成煤期整体处于半干旱气候。
Abstract:In order to study the geochemical characteristics and sedimentary environment of the Middle Jurassic coal seam in the southwestern margin of the North China Plate, taking the coal of Yima Formation in Yima Basin as the research object to study the geochemical characteristics and sedimentary environment of Middle Jurassic coal seams in the southwest margin of the North China plate, based on the data from X-ray fluorescence spectrometer and plasma mass spectrometer. The results show that: The content of major element of SiO2, P2O5 and K2O are significantly higher, while the content of Al2O3 is lower compared with Chinese coals. Enrichment of Cs and deficit of Sb, Nb, Ta, Zr and Hf in trace elements. The rare earth elements are slightly enriched as a whole, with negative Eu anomalies and positive Ce anomalies, indicating that the coal seam was not affected by magma, hydrothermal and seawater, and the provenance is mainly terrigenous clastic. It shows that the coal forming environment in reductive environment, and the whole coal forming period is in semi-arid climate environment by the analysis of Th/U, V/ (V+Ni), Ce anomaly, Sr/Cu and climate index.
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Keywords:
- middle jurassic /
- geochemistry /
- depositional environment /
- coal /
- Yima Basin
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图 4 煤样地化特征反映的泥炭沼泽介质氧化还原环境演化
Figure 4. Evolution of redox environment of peat swamp reflected by geochemical characteristics of coal samples
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图 5 煤样地化特征反映的古气候环境演化
Figure 5. Evolution of palaeoclimate environment reflected by geochemical characteristics of coal samples
表 1 义马盆地中侏罗世煤样微量元素分析结果
Table 1 Content of trace elements in middle Jurassic coal from Yima Basin
项目 含量/（μg·g−1） Li Be Sc V Cr Co Ni Cu Zn Ga Rb Sr Mo Cd In Sb Cs Ba W Re T1 Pb Bi Th U Nb Ta Zr Hf Sr/Cu Th/U V/(V+Ni) BLT-1 97.50 4.400 19.5 347 171 44.3 89.7 49.9 172 27.4 115 71.1 1.44 0.245 0.09 0.108 10.6 137 0.054 0.003 0.663 13.7 0.262 8.23 1.2 0.192 0.007 4.43 0.148 1.42 6.86 0.79 BLT-2 16.00 2.880 6.28 35.7 21.6 10 14.6 14.2 25.1 7.62 32.3 311 3.64 0.234 0.032 0.118 4.05 116 0.772 0.003 2.37 7.64 0.107 2.57 1.53 0.18 0.005 5.49 0.178 21.90 1.68 0.71 BLT-3 35.60 2.360 6.43 36 21.8 14.7 17 14.2 105 10.9 40.2 347 2.9 0.26 0.034 0.147 5.10 164 0.313 0.003 1.14 15.9 0.226 8.1 3.03 0.219 0.004 15.8 0.474 24.44 2.67 0.68 BLT-4 10.70 2.270 5.81 26.4 23.2 8.39 12.1 11.6 12.6 6.26 31.8 381 3.59 0.226 0.025 0.164 4.76 295 1.1 0.005 0.392 4.99 0.094 1.97 0.806 0.294 0.004 6.77 0.19 32.84 2.44 0.69 BLT-5 61.80 4.790 16.6 149 62.2 17.4 40.9 15.3 26.3 14.2 164 398 2.63 0.115 0.067 0.038 21.1 231 0.191 0.003 3.1 14.9 0.202 6.55 2.11 0.068 0.005 6.6 0.171 26.01 3.10 0.78 BLT-6 10.10 3.440 6.08 214 26.6 14.4 35.4 9.57 33.7 5.96 31.3 407 4.76 0.145 0.015 0.08 3.35 132 1.59 <0.002 1.99 2.95 0.05 1.49 0.565 0.174 0.003 4.54 0.122 42.53 2.64 0.86 BLT-7 60.90 5.810 15.9 103 56.2 19.3 46.5 19.1 31.8 13.3 126 610 2.33 0.142 0.065 0.037 19.4 1046 0.092 0.002 2.3 15.5 0.237 7.02 2.44 0.054 0.005 9 0.294 31.94 2.88 0.69 BLT-8 19.80 5.450 10.1 47.8 32.9 4.85 8.93 12.6 10.2 8.96 40.3 4176 2.56 0.074 0.058 0.042 6.13 989 0.445 0.007 0.306 35.2 0.267 5.46 1.11 0.121 0.008 13.6 0.484 331.43 4.92 0.84 BLT-9 7.23 1.040 3.89 29.7 15.9 5.8 8.51 8.6 8.67 4.6 12 1197 2.94 0.063 0.016 0.099 1.96 377 0.894 0.003 0.129 140 0.465 1.23 0.555 0.28 0.009 4.94 0.177 139.19 2.22 0.78 BLT-10 7.37 1.200 4.24 28.3 17.3 4.64 8.3 8.69 8.04 4.2 36 776 3.25 0.029 0.021 0.098 3.96 308 0.912 0.003 0.221 4.85 0.073 1.72 0.694 0.344 0.005 7.11 0.239 89.30 2.48 0.77 BLT-11 3.14 1.320 3.08 18.5 12.2 4.6 7.75 6.71 9.3 3.52 25.3 658 4.56 0.069 0.013 0.058 3.17 362 0.81 0.003 0.218 2.77 0.065 1.18 0.446 0.246 0.004 5.93 0.174 98.06 2.65 0.70 BLT-12 41.60 5.070 15.1 120 56.9 34.5 81.8 20.2 62.9 13.2 65.6 875 4.25 0.193 0.074 0.135 7.95 338 0.235 0.003 3.66 23.9 0.227 5.73 2.55 0.158 0.005 17 0.498 43.32 2.25 0.59 BLT-13 26.50 3.790 11.8 66.1 43.3 24.4 41.6 18.9 126 13.5 82.9 1284 5.55 0.295 0.055 0.199 10.9 473 0.655 0.004 1.58 33.6 0.267 4.52 2.24 0.295 0.005 15.5 0.486 67.94 2.02 0.61 BLT-14 10.70 4.590 13.2 89.3 33.3 40.7 78.8 19 26.2 14 46.8 1545 5.41 0.26 0.034 0.34 6.17 583 1.2 <0.002 5.53 9.37 0.162 2.65 3.3 0.762 0.007 16.6 0.487 81.32 0.80 0.53 BLT-15 19.00 5.170 14.1 331 50.9 5.67 11.2 15.6 10.5 12.8 42.8 1395 3.3 0.079 0.03 0.186 5.74 484 0.761 0.004 0.199 5.28 0.09 2.35 1.39 0.341 0.004 11.7 0.321 89.42 1.69 0.97 BLT-16 7.62 3.170 9.25 142 37 30.4 71 16 34.7 10 19.9 991 7.28 0.334 0.044 0.341 2.96 402 1.44 0.003 0.632 7.83 0.098 1.98 2.86 0.611 0.006 15.2 0.477 61.94 0.69 0.67 BLT-17 27.10 5.350 14.4 82.3 41.5 6.61 16 17 20.3 12.7 32.2 3232 3.21 0.133 0.05 0.101 4.41 1261 0.275 0.004 0.836 11.9 0.179 3.75 1.77 0.235 0.006 14.2 0.452 190.12 2.12 0.84 BLT-18 12.20 2.350 4.14 44.3 14.6 5.09 8.6 10.3 10.6 4.15 12.4 667 5.35 0.078 0.015 0.122 2.66 303 1.09 0.003 0.097 2.4 0.044 0.995 0.616 0.394 0.005 5.47 0.164 64.76 1.62 0.84 BLT-19 15.80 1.930 3.63 229 22.3 5.79 24.3 9.4 14.2 2.81 10.3 862 4.29 0.109 0.009 0.167 1.40 308 1.05 0.008 0.056 16.2 0.07 0.524 0.575 0.552 0.015 3.84 0.107 91.70 0.91 0.90 BLT-20 18.60 2.480 12.1 147 43 13 56.1 12.9 12.9 14.6 27.8 677 4.93 0.104 0.033 0.268 4.36 302 1.06 0.002 1.24 11.8 0.102 3.23 4.12 0.553 0.007 16.2 0.483 52.48 0.78 0.72 BLT-21 47.10 3.460 11.9 243 60.1 19.1 27.3 22.3 20.2 14.7 78.5 1331 2.93 0.116 0.054 0.126 10.3 831 0.415 0.002 0.981 12.2 0.213 4.77 2.29 0.292 0.003 20.4 0.569 59.69 2.08 0.90 BLT-22 32.00 5.080 10.2 274 46.1 6.39 11.4 11.8 10.2 9.33 47.3 1591 3.04 0.094 0.025 0.077 6.82 918 0.653 0.003 0.438 6.38 0.082 2.3 1.07 0.153 0.005 8.82 0.244 134.83 2.15 0.96 BLT-23 28.80 6.550 21.7 378 79 18.6 23.8 19 58 23.3 41.4 781 5.47 0.282 0.038 0.342 5.14 335 1.18 <0.002 0.847 9.84 0.111 3.58 4.41 0.591 0.005 25.9 0.658 41.11 0.81 0.94 BLT-24 193.00 6.780 22.1 114 83.8 11.2 32.6 26.2 55.9 30.3 201 690 2.04 0.103 0.149 0.029 23.7 399 0.046 0.003 2.18 29.6 0.42 15.3 2.12 0.056 0.005 11.7 0.361 26.34 7.22 0.78 BLT-25 41.60 12.700 30 216 91.3 9.76 16.4 23.5 19.9 17 22.1 1 861 11.9 0.146 0.089 0.376 2.78 1013 0.639 0.003 0.573 26 0.23 6.84 4.51 0.499 0.006 24.3 0.638 79.19 1.52 0.93 BLT-26 88.80 3.650 13.4 113 59.6 9.35 21.5 19.6 36.3 23.1 168 875 2.26 0.176 0.105 0.056 19.4 432 0.192 0.002 1.49 25.5 0.382 11.3 1.43 0.032 0.004 10.5 0.318 44.64 7.90 0.84 BLT-27 32.90 7.890 26.9 583 112 5.95 18.2 10.5 49.8 27.1 40.4 1 422 4.16 0.066 0.036 0.499 4.27 781 1.72 0.003 0.312 4.22 0.049 3.96 2.57 0.497 0.004 8.47 0.221 135.43 1.54 0.97 BLT-28 14.00 7.820 16.8 254 53.6 31.3 33.7 16.6 123 20.8 33.1 2 134 7.79 0.215 0.042 0.295 3.49 1024 0.851 0.003 0.8 10.8 0.154 3.32 6.08 0.54 0.008 18.9 0.557 128.55 0.55 0.88 BLT-29 41.20 9.620 19.3 90.5 66.5 9.01 16.5 18.2 18.6 14.4 69 1571 2.64 0.079 0.077 0.035 9.16 892 0.122 0.004 0.939 22.4 0.229 7.77 2.35 0.12 0.008 8.53 0.287 86.32 3.31 0.85 BLT-30 107.00 6.810 17.9 191 72.5 8.77 21.2 35.5 137 27.8 195 308 0.915 0.283 0.144 0.06 22 268 0.057 <0.002 1.88 27.3 0.403 13.9 2.99 0.066 0.006 8.6 0.25 8.68 4.65 0.90 BLT-31 37.60 3.600 14.9 58.4 51.5 8.85 19.8 20.3 75.6 20.4 143 213 2.14 0.072 0.088 0.04 16.3 188 0.047 <0.002 1.53 24.1 0.335 10.9 2.77 0.048 0.01 7.21 0.263 10.49 3.94 0.75 均值 37.85 4.61 12.93 154.88 50.96 14.61 29.73 17.20 44.05 13.96 65.60 1085.07 3.98 0.16 0.05 0.15 8.18 506.19 0.67 <0.003 1.25 18.68 0.19 5.01 2.15 0.29 0.01 11.40 0.34 75.40 2.68 0.79 地壳 23.0 1.73 16.0 143.0 127.0 24.7 81.3 56.0 76.3 16.7 108.0 382.0 1.43 0.177 0.097 0.51 1.23 463.0 1.13 — 0.73 14.0 0.19 7.6 2.07 18.3 1.6 148.0 4.5 — — — 中国煤值 31.80 2.11 4.38 35.10 15.40 7.08 13.70 17.50 41.40 6.55 9.25 140.00 3.08 0.25 0.05 0.84 1.13 159.00 1.08 — 0.47 15.10 0.79 5.48 2.43 9.44 0.62 89.50 3.71 — — — 世界煤值 12.00 1.60 3.90 25.00 16.00 5.10 13.00 16.00 23.00 5.80 14.00 110.00 2.20 0.22 0.03 0.92 1.00 150.00 1.10 — 0.63 7.80 0.97 3.30 2.40 3.70 0.28 36.00 1.20 — — — 中国J-K煤 5.00 2.40 3.00 13.00 12.00 8.00 11.00 9.00 33.00 4.00 7.00 79.00 2.00 0.10 — 0.90 1.80 150.00 1.90 — 0.40 9.00 0.30 4.00 2.00 8.00 0.50 39.00 1.00 — — — 富集系数（R1） 1.19 2.18 2.95 4.41 3.31 2.06 2.17 0.98 1.06 2.13 7.09 7.75 1.29 0.64 1.00 0.18 7.24 3.18 0.62 — 2.66 1.24 0.24 0.91 0.88 0.03 0.02 0.13 0.09 — — — 富集系数（R2） 3.15 2.88 3.32 6.20 3.19 2.86 2.29 1.08 1.92 2.41 4.69 9.86 1.81 0.73 1.67 0.16 8.18 3.37 0.61 — 1.98 2.39 0.20 1.52 0.90 0.08 0.04 0.32 0.28 — — — 富集系数（R3） 7.57 1.92 4.31 11.91 4.25 1.83 2.70 1.91 1.33 3.49 9.37 13.74 1.99 1.60 — 0.17 4.54 3.37 0.35 — 3.13 2.08 0.63 1.25 1.08 0.04 0.02 0.29 0.34 — — — 富集系数（R4） 1.65 2.66 0.81 1.08 0.40 0.59 0.37 0.31 0.58 0.84 0.61 2.84 2.78 0.90 0.52 0.29 6.65 1.09 0.59 — 1.71 1.33 1.00 0.66 1.04 0.02 0.01 0.08 0.08 — — — 富集系数（EF） 2.04 3.30 1.00 1.34 0.50 0.73 0.45 0.38 0.71 1.03 0.75 3.51 3.44 1.12 0.64 0.36 8.23 1.35 0.73 — 2.12 1.65 1.24 0.82 1.29 0.02 0.01 0.10 0.09 — — — 注： “—” 表示无数据；中国煤及世界煤数据据文献[13,17]，中国J-K煤数据据来自文献[18]，地壳数据据文献[19]；EF=(Cx/CSc)e/(Cx/CSc)d，Cx为煤中某种元素平均含量值；CSc为煤中钪元素平均含量值；C'x为地壳中某元素平均含量值；C'Sc为地壳中钪元素平均含量值。 
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表 2 义马盆地中侏罗世煤样常量元素分析结果
Table 2 Content of major elements in middle Jurassic coal from Yima Basin
% 样品编号 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 平均值 中国煤 SiO2 62.93 5.39 10.98 5.86 29.56 3.92 29.87 11.76 3.54 4.46 3.49 16.38 16.05 6.40 7.10 3.55 8.78 2.62 1.18 3.95 9.95 8.42 5.36 48.46 6.20 55.09 6.56 5.18 18.18 54.55 67.37 16.87 8.47 Al2O3 15.24 2.65 5.36 1.67 10.24 1.48 10.39 4.54 1.46 1.55 1.18 5.41 5.23 2.09 2.48 1.35 4.23 0.91 0.49 1.89 4.52 3.71 2.41 18.70 3.42 17.49 3.28 2.38 6.45 18.07 16.63 5.71 5.98 Fe2O3 9.50 2.12 1.96 0.99 3.91 3.45 2.74 0.48 2.45 0.71 0.92 3.60 2.41 3.82 0.64 1.51 0.79 1.38 35.15 1.96 2.45 1.11 1.39 2.75 1.05 2.30 1.12 2.45 1.63 7.46 2.94 3.46 4.85 MgO 2.69 0.42 0.48 0.45 0.71 0.28 0.93 0.65 0.48 0.45 0.41 0.63 0.61 0.53 0.53 0.46 0.59 0.46 1.17 0.44 0.55 0.57 0.51 0.87 0.60 0.66 0.50 0.55 0.75 0.91 0.77 0.66 0.22 CaO 1.70 1.27 1.22 0.99 0.94 1.19 1.03 1.80 1.19 1.00 0.91 1.17 1.06 1.20 1.17 1.01 1.38 0.91 9.59 0.94 0.91 0.98 0.89 0.53 1.32 0.47 2.43 1.36 1.33 0.41 0.19 1.37 1.23 Na2O 0.16 0.08 0.27 0.10 0.17 0.09 0.16 0.10 0.13 0.08 0.10 0.11 0.09 0.09 0.08 0.08 0.10 0.10 0.08 0.09 0.14 0.14 0.10 0.15 0.10 0.15 0.11 0.09 0.11 0.16 0.18 0.12 0.16 K2O 2.58 0.19 0.26 0.21 1.39 0.15 1.26 0.03 0.13 0.18 0.14 0.53 0.75 0.24 0.23 0.12 0.21 0.08 0.05 0.17 0.43 0.38 0.23 2.09 0.15 2.45 0.27 0.18 0.55 3.47 4.68 0.77 0.19 MnO 0.07 0.01 0.01 0.02 0.01 0.01 0.01 0.01 0.02 0 <0.004 0 0.01 0 0.01 0 <0.004 0 0.20 0 0.01 0.01 0 0 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.02 0.015 TiO2 0.97 0.08 0.14 0.09 0.43 0.07 0.47 0.23 0.07 0.09 0.07 0.29 0.29 0.13 0.14 0.09 0.17 0.06 0.03 0.08 0.15 0.13 0.11 0.76 0.11 0.78 0.10 0.10 0.33 0.83 0.85 0.27 0.33 P2O5 0.13 0.02 0.04 0.02 0.03 0.08 0.04 0.92 0.28 0.14 0.07 0.07 0.27 0.28 0.28 0.16 0.76 0.06 0.08 0.03 0.09 0.25 0.07 0.13 0.30 0.26 0.20 0.37 0.23 0.10 0.06 0.19 0.092 SiO2/Al2O3 4.13 2.03 2.05 3.51 2.89 2.65 2.87 2.59 2.42 2.88 2.96 3.03 3.07 3.06 2.86 2.63 2.08 2.89 2.43 2.09 2.20 2.27 2.22 2.59 1.81 3.15 2.00 2.18 2.82 3.02 4.05 2.69 1.42 注：中国煤数据据来自文献[13]，BLT代表北露天矿。
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表 3 义马盆地中侏罗世煤样稀土元素分析结果
Table 3 Content of rare earth elements in middle Jurassic coal from Yima Basin
ug/g 项目 含量/（μg·g−1） La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y ∑REY δCe δEu (La/Yb)N (La/Sm)N (Gd/Yb)N BLT-1 33.5 60.5 7.44 28.7 5.36 1.07 4.65 0.756 3.42 0.594 1.46 0.215 1.2 0.154 33.9 149.02 0.92 0.66 18.82 3.93 3.13 BLT-2 9.54 18.4 2 7.86 1.48 0.282 1.29 0.216 1.16 0.229 0.604 0.103 0.654 0.088 14.1 43.91 1.01 0.62 9.83 4.05 1.59 BLT-3 11.6 23.1 2.54 9.5 1.73 0.333 1.49 0.249 1.21 0.227 0.611 0.1 0.592 0.082 13.5 53.36 1.02 0.63 13.21 4.22 2.03 BLT-4 6.89 13.6 1.62 6.53 1.34 0.316 1.19 0.214 1.17 0.224 0.608 0.106 0.652 0.091 13.2 34.55 0.98 0.77 7.12 3.23 1.47 BLT-5 30.7 60.3 6.86 26.7 4.74 0.867 3.8 0.6 2.68 0.466 1.25 0.192 1.13 0.149 26.2 140.43 1.00 0.62 18.32 4.07 2.71 BLT-6 6.12 13 1.57 6.74 1.47 0.319 1.44 0.267 1.48 0.288 0.761 0.123 0.745 0.102 18.7 34.43 1.01 0.67 5.54 2.62 1.56 BLT-7 30.6 63.3 7.29 28.6 5.08 1.14 4.17 0.677 3.09 0.538 1.37 0.209 1.22 0.157 30.7 147.44 1.02 0.76 16.91 3.79 2.76 BLT-8 17.2 34 4.06 17.9 4.11 0.942 3.36 0.586 3 0.523 1.29 0.186 1.05 0.138 30.8 88.35 0.98 0.78 11.04 2.63 2.58 BLT-9 5.1 10.8 1.31 5.55 0.979 0.258 0.856 0.149 0.747 0.141 0.387 0.066 0.394 0.055 8.95 26.79 1.01 0.86 8.73 3.28 1.75 BLT-10 3.91 9.47 1.34 6.36 1.21 0.287 1.01 0.18 0.928 0.177 0.471 0.078 0.476 0.063 11.0 25.96 1.00 0.79 5.54 2.03 1.71 BLT-11 4.31 9.33 1.08 4.39 0.97 0.264 0.87 0.154 0.855 0.162 0.445 0.075 0.455 0.062 10.7 23.42 1.04 0.88 6.39 2.79 1.54 BLT-12 15.9 28.1 3.15 12.5 2.72 0.571 2.33 0.431 2.26 0.416 1.1 0.179 1.06 0.144 24.2 70.86 0.96 0.69 10.11 3.68 1.77 BLT-13 27.8 59.1 6.61 24.4 4.17 0.823 3.64 0.567 2.63 0.465 1.2 0.186 1.13 0.147 25.0 132.87 1.05 0.65 16.59 4.19 2.60 BLT-14 25.7 58.1 6.53 24.1 4.02 0.836 3.73 0.603 3.02 0.539 1.41 0.218 1.35 0.169 28.6 130.33 1.08 0.66 12.83 4.02 2.23 BLT-15 20.4 44.7 4.94 18.1 3.21 0.691 2.89 0.484 2.36 0.421 1.06 0.173 1.03 0.13 25.4 100.59 1.07 0.69 13.35 4.00 2.26 BLT-16 6.64 14.4 1.79 8.43 1.88 0.453 1.58 0.299 1.66 0.316 0.83 0.137 0.835 0.111 18.8 39.36 1.01 0.80 5.36 2.22 1.53 BLT-17 66.5 128 12.5 43.4 6.94 1.43 6.15 0.861 3.66 0.557 1.42 0.181 1.06 0.135 30.3 272.79 1.07 0.67 42.30 6.03 4.68 BLT-18 2.72 6.63 0.943 4.18 0.847 0.235 0.828 0.164 0.931 0.19 0.519 0.088 0.543 0.075 11.8 18.89 1.00 0.86 3.38 2.02 1.23 BLT-19 4.37 10.2 1.13 4.19 0.767 0.203 0.723 0.135 0.661 0.125 0.336 0.057 0.344 0.047 8.81 23.29 1.00 0.83 8.56 3.58 1.70 BLT-20 4.54 9.38 1.06 4.19 1.16 0.306 1.10 0.242 1.49 0.306 0.841 0.152 0.957 0.134 16.1 25.86 1.03 0.83 3.20 2.46 0.93 BLT-21 14.1 25.8 2.81 10.2 1.94 0.53 1.76 0.303 1.6 0.305 0.833 0.14 0.853 0.117 17.2 61.29 0.99 0.88 11.14 4.57 1.66 BLT-22 16.7 35.9 4.5 18.8 3.59 0.849 3.06 0.506 2.41 0.43 1.09 0.171 0.995 0.129 26.6 89.13 1.00 0.78 11.32 2.93 2.48 BLT-23 8.72 20.1 2.27 8.71 2.07 0.507 2.05 0.435 2.52 0.5 1.32 0.23 1.39 0.189 29.2 51.01 1.09 0.75 4.23 2.65 1.19 BLT-24 42.2 77.7 9.09 34.9 6.26 1.13 4.79 0.758 3.31 0.566 1.48 0.215 1.29 0.157 30.4 183.85 0.95 0.63 22.06 4.24 3.00 BLT-25 43.7 85 9.19 33.1 5.11 1.12 4.72 0.773 3.62 0.644 1.66 0.255 1.52 0.196 37.6 190.61 1.02 0.70 19.38 5.38 2.51 BLT-26 46.4 83.3 9.4 35.1 6.04 1.08 4.78 0.716 2.99 0.49 1.21 0.165 0.994 0.12 26.5 192.79 0.96 0.61 31.47 4.83 3.88 BLT-27 13.8 27.2 3.11 12.1 2.31 0.599 2.06 0.385 2.06 0.387 1.08 0.181 1.15 0.159 23.5 66.58 1.00 0.84 8.09 3.76 1.45 BLT-28 61.8 123 13 44.9 6.9 1.35 6.23 0.881 3.82 0.646 1.66 0.249 1.49 0.199 34.5 266.13 1.04 0.63 27.96 5.63 3.37 BLT-29 38.7 78.5 8.2 30.3 5.61 1.15 4.78 0.783 3.85 0.693 1.81 0.283 1.67 0.226 37 176.56 1.06 0.68 15.62 4.34 2.31 BLT-30 58.1 107 12.4 47.4 8.32 1.5 7.04 1.08 4.52 0.73 1.84 0.253 1.49 0.191 43.1 251.86 0.96 0.60 26.29 4.39 3.81 BLT-31 52.7 95.2 11.1 41.3 6.85 1.18 5.50 0.808 3.3 0.54 1.35 0.181 1.03 0.126 27.5 221.17 0.95 0.59 34.50 4.84 4.31 均值 23.58 46.23 5.19 19.65 3.52 0.73 3.03 0.49 2.34 0.41 1.07 0.17 0.99 0.13 23.67 149.02 1.01 0.72 14.49 3.76 2.31 中国煤 22.50 46.70 6.42 22.30 4.07 0.84 4.65 0.62 3.74 18.20 0.96 1.79 0.64 0.38 2.08 136.00 — — — — — 世界煤 11.00 23.00 3.50 12.00 2.00 0.47 2.70 0.32 2.10 8.40 0.54 0.93 0.31 0.20 1.00 68.47 — — — — — 富集系数（CC） 2.14 2.01 1.48 1.97 1.76 1.55 1.12 1.53 1.11 0.049 1.98 0.18 3.19 0.65 23.67 2.18 — — — — — 注：中国煤数据与世界煤数据来源于文献[13]，$\delta \text{Ce}\text{=}{\text{Ce}}_{\text{N}}/\sqrt{{\text{La}}_{\text{N}}\text{×}{\text{Pr}}_{\text{N}}} $，CeN、LaN、PrN为Ce、La、Pr元素球粒陨石标准化值；$\delta \text{Eu}\text{=}{\text{Eu} }_{\text{N} }/\sqrt{ {\text{Sm} }_{\text{N} }\text{×}{\text{Gd} }_{\text{N} } }$，EuN、SmN、GdN为元素球粒陨石标准化值[20]；球粒陨石数据据文献[21]；富集系数（CC）为样品中稀土元素含量/世界煤中稀土元素含量；“—” 为无数据。
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