0 引言
1 区域地质特征
图2 陇东地区太原组铝土岩系岩心序列Fig.2 Core sequence of bauxite series of Taiyuan Formation in the Longdong area |
图3 陇东地区铝土岩系典型岩心照片(a)L82井,井深4 044.30 m,灰色菱铁矿泥岩;(b)L58井,井深4 060.05 m,块状伊利石泥岩;(c) HT7井,井深4 458.50 m,铝土质泥岩,流变结构;(d)L58井,井深4 048.75 m,土状、多孔状铝土岩;(e)HT7井,井深 4447.25 m,豆鲕状铝土岩,多孔;(f)HT7井,4 452.54 m,豆鲕状铝土岩,半充填;(g)L58井,井深4 041.35 m,豆鲕、碎屑状泥质铝土岩;(h)HT7井,井深4 437.01 m,硅质泥岩;(i)HT7井,井深4 440.28 m,高岭石泥岩,黄铁矿团块 Fig.3 Typical core photos of bauxite series in Longdong area |
图4 陇东地区铝土岩系铸体薄片及扫描电镜照片(a) L58井, 4 041.00 m,铝土质泥岩,流变结构、碎屑状结构,碎屑为一水铝石(单偏光);(b) L58井,4 044.99 m,铝土岩,溶孔中锐钛矿、针状水铝石矿物充填(扫描电镜);(c) L58井,4 042.54 m,铝土岩中的矿物,自半形晶水铝石、黄铁矿、高岭石、磷灰石(扫描电镜);(d) L58井,4 044.99 m,铝土岩,凝胶状水铝石团块,并发生溶蚀(单偏光);(e)HT7井,4 449.26 m,豆鲕状铝土岩,豆鲕粒内溶孔,自生柱状一水铝石半充填(单偏光);(f) L58井,4 041.54 m,泥质铝土岩,具鲕粒结构,塑性颗粒拉长变形(单偏光) Fig.4 Thin section and SEM images of bauxite series in Longdong area |
2 样品采集和分析方法
3 铝土岩系地球化学特征
3.1 元素分布特征
3.1.1 常量元素
表1 鄂尔多斯盆地陇东地区铝土岩系典型井样品常量元素含量 (%)Table 1 Content of major elements in typical well samples of bauxite rock series in the Longdong area of the Ordos Basin |
| 井号 | 井深/m | 岩性 | SiO2 | Al2O3 | FeO | Fe2O3 | TiO2 | MgO | CaO | Na2O | K2O | P2O5 | MnO | TFe2O3 | LOI | CIA |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L58 | 4 045.24 | 铝土岩 | 3.13 | 72.84 | 0.52 | 1.62 | 2.36 | 0.00 | 0.12 | 0.05 | 0.18 | 0.06 | 0.00 | 2.19 | 16.44 | 99.62 |
| L58 | 4 045.55 | 3.73 | 73.96 | 0.97 | 0.01 | 3.68 | 0.18 | 0.18 | 0.05 | 0.19 | 0.10 | 0.00 | 1.08 | 16.43 | 99.61 | |
| L58 | 4 045.90 | 3.40 | 73.41 | 0.01 | 0.91 | 3.82 | 0.08 | 0.18 | 0.18 | 0.15 | 0.11 | 0.00 | 0.92 | 17.40 | 99.31 | |
| L58 | 4 047.10 | 4.08 | 73.68 | 0.65 | 0.41 | 2.88 | 0.00 | 0.13 | 0.05 | 0.09 | 0.12 | 0.00 | 1.12 | 16.70 | 99.74 | |
| L58 | 4 047.82 | 5.42 | 71.29 | 0.17 | 0.90 | 3.57 | 0.00 | 0.13 | 0.12 | 0.14 | 0.21 | 0.00 | 1.09 | 17.60 | 99.47 | |
| L58 | 4 049.50 | 2.45 | 74.53 | 0.69 | 0.45 | 3.84 | 0.03 | 0.19 | 0.05 | 0.09 | 0.28 | 0.00 | 1.21 | 16.64 | 99.75 | |
| HT7 | 4 444.57 | 6.22 | 72.39 | 0.34 | 0.70 | 3.85 | 0.23 | 0.26 | 0.02 | 0.43 | 0.19 | 0.01 | 1.08 | 15.43 | 99.35 | |
| HT7 | 4 446.18 | 4.96 | 75.03 | 0.28 | 0.78 | 2.79 | 0.20 | 0.13 | 0.03 | 0.36 | 0.16 | 0.01 | 1.09 | 15.44 | 99.44 | |
| HT7 | 4 447.11 | 4.75 | 74.35 | 0.36 | 0.78 | 3.76 | 0.19 | 0.13 | 0.02 | 0.26 | 0.10 | 0.01 | 1.18 | 15.65 | 99.60 | |
| HT7 | 4 448.81 | 1.69 | 77.54 | 0.17 | 0.47 | 3.66 | 0.16 | 0.13 | 0.03 | 0.25 | 0.14 | <0.01 | 0.66 | 15.79 | 99.60 | |
| HT7 | 4 449.26 | 5.55 | 73.42 | 0.40 | 1.05 | 3.06 | 0.26 | 0.36 | 0.02 | 0.39 | 0.15 | 0.01 | 1.49 | 15.24 | 98.42 | |
| HT7 | 4 450.07 | 7.92 | 71.26 | 1.10 | 0.12 | 3.22 | 0.21 | 0.14 | 0.01 | 0.26 | 0.10 | 0.01 | 1.34 | 15.36 | 99.61 | |
| HT7 | 4 451.17 | 5.71 | 74.47 | 0.21 | 0.73 | 3.04 | 0.19 | 0.08 | 0.03 | 0.47 | 0.15 | 0.01 | 0.96 | 15.56 | 99.29 | |
| HT7 | 4 451.95 | 7.41 | 71.21 | 0.60 | 0.51 | 3.86 | 0.21 | 0.09 | 0.02 | 0.44 | 0.10 | 0.01 | 1.18 | 15.75 | 99.33 | |
| HT7 | 4 455.21 | 7.17 | 70.20 | 1.92 | 1.44 | 2.85 | 0.35 | 0.09 | 0.01 | 0.28 | 0.07 | 0.01 | 3.57 | 15.39 | 99.57 | |
| HT7 | 4 455.90 | 10.22 | 68.91 | 1.32 | 1.10 | 2.87 | 0.30 | 0.08 | 0.01 | 0.52 | 0.06 | 0.01 | 2.57 | 14.77 | 99.22 | |
| C3⁃25⁃11 | 3 806.65 | 7.17 | 70.10 | 1.82 | 1.78 | 3.26 | 0.25 | 0.12 | 0.01 | 0.11 | 0.05 | 0.01 | 3.80 | 14.98 | 99.81 | |
| C3⁃25⁃11 | 3 807.40 | 8.74 | 71.04 | 0.97 | 0.62 | 3.33 | 0.16 | 0.06 | 0.01 | 0.10 | 0.06 | 0.01 | 1.70 | 14.99 | 99.83 | |
| 平均值 | 铝土岩 | 5.54 | 72.76 | 0.69 | 0.80 | 3.32 | 0.17 | 0.14 | 0.04 | 0.26 | 0.12 | 0.01 | 1.57 | 15.86 | 99.53 | |
| L58 | 4 041.17 | 泥质铝土岩 | 23.96 | 53.92 | 1.17 | 0.64 | 2.79 | 0.03 | 0.13 | 0.05 | 1.28 | 0.07 | 0.00 | 1.93 | 15.04 | 97.50 |
| L58 | 4 041.74 | 14.92 | 56.34 | 1.11 | 3.21 | 2.94 | 0.04 | 0.61 | 0.05 | 1.76 | 0.47 | 0.00 | 4.43 | 15.20 | 96.80 | |
| L58 | 4 042.82 | 24.82 | 51.36 | 1.12 | 0.44 | 3.24 | 0.26 | 0.29 | 0.05 | 0.64 | 0.12 | 0.00 | 1.67 | 16.97 | 98.58 | |
| L58 | 4 044.63 | 33.80 | 43.70 | 1.16 | 0.12 | 1.69 | 0.43 | 0.12 | 0.05 | 0.52 | 0.06 | 0.00 | 1.40 | 17.83 | 98.60 | |
| L58 | 4 051.10 | 17.11 | 57.39 | 0.02 | 1.17 | 3.76 | 0.38 | 0.11 | 0.15 | 0.63 | 0.24 | 0.00 | 1.19 | 18.63 | 98.47 | |
| L58 | 4 051.71 | 33.44 | 44.35 | 0.01 | 1.23 | 3.60 | 0.65 | 0.13 | 0.05 | 0.97 | 0.17 | 0.00 | 1.24 | 14.96 | 97.64 | |
| L58 | 4 052.20 | 34.21 | 44.05 | 1.18 | 0.05 | 2.98 | 0.66 | 0.08 | 0.05 | 0.45 | 0.18 | 0.00 | 1.35 | 15.58 | 98.77 | |
| HT7 | 4 453.13 | 17.02 | 62.00 | 0.62 | 0.71 | 3.36 | 0.38 | 0.14 | 0.01 | 1.70 | 0.11 | 0.01 | 1.40 | 14.12 | 97.30 | |
| HT7 | 4 456.84 | 18.41 | 57.80 | 2.75 | 1.51 | 3.05 | 0.70 | 0.14 | 0.02 | 1.80 | 0.12 | 0.01 | 4.57 | 13.09 | 96.91 | |
| C3⁃25⁃11 | 3 808.42 | 41.71 | 39.10 | 1.52 | 0.75 | 1.87 | 0.40 | 0.04 | 0.01 | 1.75 | 0.05 | 0.01 | 2.44 | 13.09 | 95.67 | |
| L81 | 3 910.29 | 32.77 | 40.55 | 0.44 | 4.89 | 1.55 | 0.41 | 0.08 | 0.01 | 0.50 | 0.07 | 0.01 | 5.38 | 19.22 | 98.73 | |
| L81 | 3 911.23 | 32.99 | 40.88 | 0.29 | 4.37 | 2.54 | 0.60 | 1.15 | 0.03 | 0.89 | 0.11 | 0.02 | 4.69 | 15.56 | 97.73 | |
| 平均值 | 泥质铝土岩 | 27.10 | 49.29 | 0.95 | 1.59 | 2.78 | 0.41 | 0.25 | 0.04 | 1.07 | 0.15 | 0.01 | 2.64 | 15.77 | 97.70 | |
| L58 | 4 040.62 | 铝土质泥岩 | 40.03 | 35.93 | 0.58 | 1.85 | 2.27 | 0.08 | 0.04 | 0.05 | 0.67 | 0.05 | 0.00 | 2.49 | 15.67 | 97.93 |
| L58 | 4 041.00 | 38.83 | 39.07 | 1.03 | 0.59 | 2.61 | 0.30 | 0.12 | 0.05 | 1.72 | 0.06 | 0.00 | 1.72 | 14.62 | 95.55 | |
| L58 | 4 053.29 | 44.02 | 34.91 | 0.94 | 0.04 | 2.40 | 0.73 | 0.09 | 0.24 | 7.53 | 0.12 | 0.00 | 1.07 | 8.52 | 81.62 | |
| L58 | 4 053.62 | 44.16 | 33.78 | 0.67 | 0.36 | 2.26 | 0.72 | 0.09 | 0.18 | 7.44 | 0.10 | 0.00 | 1.10 | 9.66 | 81.42 | |
| L58 | 4 053.80 | 39.43 | 39.34 | 0.83 | 0.21 | 2.31 | 0.66 | 0.09 | 0.21 | 6.95 | 0.10 | 0.00 | 1.12 | 9.42 | 84.44 | |
| L58 | 4 059.80 | 39.84 | 34.74 | 0.66 | 0.67 | 1.54 | 0.86 | 0.97 | 0.68 | 6.35 | 0.19 | 0.01 | 1.40 | 12.41 | 81.84 | |
| L58 | 4 059.95 | 41.74 | 34.40 | 0.67 | 0.32 | 1.34 | 0.65 | 0.52 | 0.71 | 6.49 | 0.14 | 0.00 | 1.06 | 12.23 | 81.67 | |
| L82 | 4 048.56 | 37.12 | 39.96 | 2.39 | 1.41 | 1.93 | 0.49 | 0.16 | 0.05 | 3.48 | 0.16 | 0.03 | 4.07 | 12.28 | 91.78 | |
| 平均值 | 铝土质泥岩 | 40.65 | 36.52 | 0.97 | 0.68 | 2.08 | 0.56 | 0.26 | 0.27 | 5.08 | 0.12 | 0.01 | 1.75 | 11.85 | 86.68 | |
| L58 | 4 033.82 | 泥岩 | 59.93 | 18.57 | 4.35 | 0.23 | 0.83 | 0.99 | 0.28 | 0.05 | 1.34 | 0.03 | 0.06 | 5.02 | 12.19 | 92.80 |
| L58 | 4 035.84 | 51.21 | 19.11 | 8.80 | 0.39 | 0.85 | 0.97 | 0.45 | 0.05 | 2.09 | 0.18 | 0.30 | 10.07 | 13.94 | 89.72 | |
| L58 | 4 038.64 | 43.06 | 33.30 | 0.52 | 1.71 | 0.93 | 0.05 | 0.19 | 0.05 | 0.42 | 0.02 | 0.01 | 2.28 | 15.63 | 98.46 | |
| L58 | 4 040.00 | 44.05 | 36.33 | 0.49 | 0.46 | 1.78 | 0.02 | 0.07 | 0.05 | 0.30 | 0.04 | 0.00 | 1.00 | 15.34 | 98.91 | |
| L58 | 4 040.12 | 43.96 | 35.92 | 0.49 | 0.40 | 2.31 | 0.07 | 0.08 | 0.05 | 0.57 | 0.04 | 0.00 | 0.94 | 15.55 | 98.17 | |
| L58 | 4 040.42 | 40.20 | 33.05 | 0.57 | 2.84 | 1.97 | 0.17 | 0.07 | 0.05 | 1.54 | 0.04 | 0.00 | 3.47 | 16.99 | 95.27 | |
| L58 | 4 056.00 | 35.36 | 39.71 | 1.48 | 0.55 | 2.02 | 1.68 | 1.76 | 0.16 | 3.97 | 0.10 | 0.01 | 2.18 | 12.44 | 90.25 | |
| L58 | 4 060.05 | 41.18 | 33.50 | 0.70 | 0.59 | 1.85 | 0.70 | 0.45 | 0.75 | 6.67 | 0.12 | 0.00 | 1.36 | 12.15 | 80.98 | |
| L58 | 4 070.22 | 44.05 | 31.04 | 0.38 | 0.68 | 1.33 | 0.68 | 0.32 | 0.66 | 9.00 | 0.10 | 0.00 | 1.10 | 10.09 | 75.67 | |
| L58 | 4 071.20 | 44.02 | 31.44 | 0.37 | 0.92 | 1.43 | 0.66 | 0.22 | 0.39 | 9.31 | 0.06 | 0.00 | 1.33 | 8.63 | 76.02 | |
| L58 | 4 071.80 | 44.36 | 31.29 | 0.43 | 0.63 | 1.66 | 0.79 | 0.22 | 0.47 | 9.39 | 0.08 | 0.00 | 1.10 | 9.30 | 75.63 | |
| L58 | 4 072.59 | 45.46 | 33.28 | 0.52 | 0.21 | 1.34 | 0.78 | 0.20 | 0.38 | 8.71 | 0.07 | 0.00 | 0.78 | 8.69 | 78.18 | |
| L58 | 4 073.60 | 45.71 | 30.80 | 0.53 | 0.25 | 1.98 | 1.01 | 0.22 | 0.46 | 9.66 | 0.08 | 0.00 | 0.83 | 9.08 | 74.87 | |
| HT7 | 4 440.50 | 59.89 | 23.99 | 0.60 | 0.42 | 1.07 | 0.59 | 0.20 | 0.02 | 2.82 | 0.03 | 0.01 | 1.09 | 10.41 | 89.35 | |
| HT7 | 4 457.81 | 42.02 | 35.23 | 1.66 | 0.88 | 1.54 | 2.23 | 0.16 | 0.01 | 4.53 | 0.07 | 0.01 | 2.72 | 10.98 | 88.56 | |
| 平均值 | 泥岩 | 45.63 | 31.10 | 1.46 | 0.74 | 1.53 | 0.76 | 0.33 | 0.24 | 4.69 | 0.07 | 0.03 | 2.35 | 12.09 | 85.75 | |
| L58 | 4 039.22 | 33.12 | 25.52 | 0.64 | 13.23 | 1.61 | 0.25 | 0.05 | 0.05 | 1.72 | 0.05 | 0.00 | 13.93 | 19.31 | 93.34 | |
| HT7 | 4 440.20 | 铁质泥岩 | 47.77 | 30.29 | 0.22 | 1.45 | 1.24 | 0.08 | 0.36 | 0.02 | 0.60 | 0.09 | 0.01 | 1.69 | 13.91 | 97.93 |
| C3⁃25⁃11 | 3 795.08 | 23.59 | 23.54 | 7.29 | 0.10 | 1.17 | 0.71 | 0.33 | 0.02 | 1.21 | 0.09 | <0.01 | 8.20 | 41.68 | 94.96 | |
| HT1 | 4 458.49 | 24.26 | 41.23 | 8.96 | 2.93 | 1.88 | 0.49 | 0.32 | 0.02 | 0.58 | 0.10 | 0.14 | 12.89 | 18.03 | 98.52 | |
| L82 | 4 041.47 | 25.69 | 44.42 | 6.16 | 1.57 | 2.33 | 0.40 | 0.43 | 0.04 | 0.76 | 0.26 | 0.16 | 8.42 | 16.47 | 98.14 | |
| L82 | 4 044.30 | 31.42 | 43.94 | 3.72 | 1.14 | 2.22 | 0.39 | 0.17 | 0.02 | 1.41 | 0.15 | 0.04 | 5.27 | 15.14 | 96.81 | |
| 平均值 | 铁质泥岩 | 30.98 | 34.82 | 4.50 | 3.40 | 1.74 | 0.39 | 0.28 | 0.03 | 1.05 | 0.12 | 0.07 | 8.40 | 20.76 | 96.93 |
|
3.1.2 微量元素
表2 鄂尔多斯盆地陇东地区铝土岩系典型井样品微量元素含量 (10-6)Table 2 Trace element contents in typical well samples of bauxite rock series in the Longdong area of the Ordos Basin |
| 井号 | 井深/m | 岩性 | Li | Be | Sc | V | Cr | Mn | Co | Ni | Cu | Zn | Ga | Ge | Rb | Sr | Mo | Zr | Nb | Cd | Cs | Ba | W | Hf | Ta | Pb | Th | U | Sr/Ba | V/Zr | Ni/Co | V/Cr | Th/U | Sr/Cu | Zr/Cu |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L58 | 4 045.24 | 铝 土 岩 | 136 | 2.67 | 11.2 | 86.6 | 388 | 39.4 | 36.0 | 183 | 46.4 | 37.5 | 49.3 | 1.68 | 4.39 | 473 | 8.71 | 484 | 57.9 | 0.501 | 0.272 | 854 | 6.48 | 24.1 | 2.69 | 36.9 | 47.8 | 22.7 | 0.55 | 0.18 | 5.07 | 0.22 | 2.11 | 10.19 | 10.43 |
| L58 | 4 047.1 | 34.1 | 2.60 | 15.7 | 97.0 | 194 | 19.5 | 9.14 | 71.3 | 53.2 | 63.9 | 35.8 | 1.74 | 2.72 | 584 | 4.40 | 597 | 71.3 | 0.675 | 0.207 | 34.8 | 6.30 | 31.1 | 5.78 | 26.8 | 72.3 | 20.8 | 16.79 | 0.16 | 7.80 | 0.50 | 3.47 | 10.97 | 11.22 | |
| L58 | 4 049.5 | 39.3 | 3.29 | 21.1 | 108 | 263 | 29.1 | 9.19 | 81.9 | 95.1 | 95.2 | 48.1 | 1.83 | 3.06 | 1 323 | 5.35 | 884 | 101 | 1.13 | 0.225 | 140 | 10.7 | 40.3 | 16.4 | 66.7 | 117 | 30.3 | 9.44 | 0.12 | 8.91 | 0.41 | 3.86 | 13.91 | 9.30 | |
| HT7 | 4 444.57 | 65.7 | 7.12 | 41.3 | 66.9 | 150 | 18.3 | 10.1 | 42.1 | 47.5 | 55.9 | 41.5 | 1.55 | 18.6 | 529 | 2.34 | 505 | 91.9 | 0.17 | 1.04 | 73.7 | 9.80 | 17.9 | 8.1 | 156 | 110 | 42.6 | 7.17 | 0.13 | 4.17 | 0.45 | 2.58 | 11.13 | 10.63 | |
| HT7 | 4 446.18 | 27.1 | 7.32 | 34.1 | 73.5 | 117 | 15.1 | 19.2 | 52.5 | 58.2 | 24.9 | 47.0 | 1.52 | 17.1 | 601 | 4.97 | 377 | 72.6 | 0.04 | 0.95 | 69.2 | 7.12 | 13.4 | 7.6 | 110 | 93.4 | 33.2 | 8.68 | 0.19 | 2.73 | 0.63 | 2.81 | 10.32 | 6.48 | |
| HT7 | 4 447.11 | 22.2 | 6.40 | 37.2 | 80.5 | 152 | 18.7 | 11.5 | 37.0 | 38.2 | 17.5 | 43.1 | 1.04 | 8.85 | 251 | 1.96 | 454 | 96.3 | <0.02 | 0.71 | 33.9 | 9.14 | 16.1 | 13.8 | 79.4 | 77.5 | 34.6 | 7.40 | 0.18 | 3.22 | 0.53 | 2.24 | 6.57 | 11.88 | |
| HT7 | 4 448.81 | 8.03 | 6.80 | 37.4 | 59.4 | 143 | 13.4 | 7.4 | 22.9 | 38.7 | 14.5 | 45.1 | 1.32 | 7.48 | 350 | 1.42 | 476 | 78.1 | <0.02 | 0.65 | 29.0 | 8.75 | 16.0 | 9.4 | 96.0 | 91.9 | 37.3 | 12.07 | 0.12 | 3.09 | 0.42 | 2.46 | 9.04 | 12.30 | |
| HT7 | 4 449.26 | 26.9 | 7.78 | 37.3 | 68.1 | 137 | 30.6 | 8.0 | 51.9 | 75.6 | 19.0 | 51.0 | 1.17 | 16.5 | 413 | 1.85 | 398 | 72.0 | <0.02 | 0.95 | 70.1 | 7.30 | 13.6 | 5.2 | 125 | 78.9 | 31.4 | 5.89 | 0.17 | 6.52 | 0.50 | 2.51 | 5.46 | 5.26 | |
| HT7 | 4 450.07 | 45.6 | 8.36 | 38.1 | 74.6 | 140 | 23.6 | 12.4 | 55.6 | 43.2 | 40.4 | 49.0 | 1.00 | 12.9 | 336 | 1.62 | 424 | 83.0 | 0.20 | 0.84 | 47.0 | 8.90 | 14.0 | 6.4 | 121 | 76.6 | 34.0 | 7.15 | 0.18 | 4.48 | 0.53 | 2.25 | 7.78 | 9.81 | |
| HT7 | 4 451.17 | 14.5 | 8.57 | 35.8 | 79.1 | 136 | 14.9 | 17.4 | 43.6 | 71.7 | 17.6 | 51.3 | 1.36 | 20.2 | 448 | 2.94 | 375 | 72.4 | <0.02 | 1.55 | 63.2 | 6.88 | 12.8 | 9.7 | 120 | 89.1 | 31.4 | 7.09 | 0.21 | 2.51 | 0.58 | 2.84 | 6.25 | 5.23 | |
| HT7 | 4 451.95 | 58.5 | 8.61 | 41.4 | 108 | 144 | 13.6 | 9.0 | 57.0 | 26.8 | 40.3 | 56.9 | 1.19 | 13.1 | 304 | 1.16 | 494 | 102 | 0.13 | 0.85 | 44.4 | 10.5 | 17.1 | 15.6 | 59.4 | 87.8 | 35.0 | 6.85 | 0.22 | 6.35 | 0.75 | 2.51 | 11.34 | 18.43 | |
| HT7 | 4 455.21 | 52.9 | 7.18 | 33.1 | 90.0 | 135 | 32.0 | 12.1 | 72.7 | 32.5 | 22.9 | 34.0 | 0.96 | 10.3 | 230 | 0.83 | 325 | 64.9 | <0.02 | 0.71 | 26.4 | 8.51 | 10.9 | 2.9 | 45.3 | 52.2 | 27.2 | 8.69 | 0.28 | 6.01 | 0.67 | 1.92 | 7.06 | 10.00 | |
| HT7 | 4 455.9 | 69.0 | 7.97 | 36.4 | 94.7 | 118 | 24.0 | 52.8 | 95.7 | 50.1 | 102 | 35.1 | 0.98 | 22.5 | 227 | 2.92 | 355 | 63.5 | 0.43 | 1.04 | 61.0 | 8.31 | 11.7 | 4.7 | 88.6 | 59.7 | 29.5 | 3.72 | 0.27 | 1.81 | 0.80 | 2.02 | 4.53 | 7.09 | |
| C3⁃25⁃11 | 3 806.65 | 41.8 | 3.95 | 38.4 | 90 | 151 | 19.6 | 5.69 | 60.3 | 15.9 | 23.5 | 46.5 | 0.93 | 5.96 | 134 | 0.891 | 461 | 83.3 | <0.02 | 0.642 | 181 | 8.24 | 15.2 | 3.7 | 38 | 74.7 | 26.9 | 0.74 | 0.20 | 10.60 | 0.60 | 2.78 | 8.45 | 28.99 | |
| C3⁃25⁃11 | 3 807.4 | 48.4 | 3.79 | 40.6 | 86.6 | 144 | 11.6 | 6.1 | 36.3 | 39.4 | 20.3 | 41.2 | 0.87 | 5.49 | 139 | 0.72 | 490 | 93.9 | <0.02 | 0.57 | 50.7 | 10.2 | 16.2 | 4.8 | 67.8 | 78.1 | 33.9 | 2.74 | 0.18 | 5.93 | 0.60 | 2.30 | 3.53 | 12.44 | |
| L58 | 4 041.17 | 泥 质 铝 土 岩 | 329 | 2.35 | 12.2 | 159 | 1015 | 92.4 | 6.72 | 195 | 46.4 | 60.5 | 37.7 | 1.32 | 27.3 | 205 | 7.84 | 962 | 59.1 | 0.470 | 1.09 | 121 | 6.64 | 22.8 | 4.57 | 27.5 | 55.4 | 14.7 | 1.70 | 0.17 | 28.95 | 0.16 | 3.76 | 4.42 | 20.73 |
| L58 | 4 041.74 | 151 | 2.48 | 14.2 | 192 | 1028 | 66.9 | 16.7 | 378 | 70.2 | 60.2 | 46.0 | 2.04 | 33.0 | 283 | 16.4 | 652 | 72.7 | 0.606 | 1.12 | 154 | 8.10 | 23.0 | 8.66 | 52.4 | 67.9 | 13.0 | 1.84 | 0.30 | 22.58 | 0.19 | 5.23 | 4.03 | 9.28 | |
| L58 | 4 042.82 | 6 598 | 4.06 | 26.1 | 156 | 164 | 47.5 | 1.72 | 36.8 | 180 | 66.6 | 51.6 | 1.16 | 13.5 | 454 | 2.65 | 883 | 79.8 | 1.17 | 0.894 | 56.4 | 11.7 | 46.8 | 7.68 | 17.8 | 147 | 39.6 | 8.05 | 0.18 | 21.37 | 0.95 | 3.70 | 2.52 | 4.90 | |
| L58 | 4 044.63 | 15 780 | 4.31 | 14.1 | 64.6 | 291 | 22.3 | 3.50 | 156 | 30.5 | 67.3 | 33.6 | 1.74 | 10.8 | 194 | 3.79 | 916 | 42.8 | 0.483 | 1.16 | 30.8 | 4.79 | 21.1 | 2.95 | 15.6 | 42.4 | 20.1 | 6.32 | 0.07 | 44.54 | 0.22 | 2.11 | 6.37 | 29.99 | |
| L58 | 4 051.10 | 6 852 | 4.14 | 25.5 | 207 | 515 | 27.4 | 6.08 | 215 | 81.4 | 106 | 53.0 | 2.09 | 14.3 | 958 | 6.64 | 914 | 96.4 | 1.18 | 0.873 | 58.9 | 8.97 | 39.9 | 15.9 | 35.0 | 113 | 28.6 | 16.27 | 0.23 | 35.29 | 0.40 | 3.94 | 11.77 | 11.23 | |
| L58 | 4 051.71 | 14 600 | 5.10 | 30.0 | 215 | 286 | 18.3 | 3.84 | 149 | 78.6 | 64.1 | 51.1 | 2.14 | 25.4 | 586 | 2.83 | 943 | 78.2 | 1.05 | 1.95 | 83.4 | 8.41 | 41.3 | 11.5 | 54.2 | 107 | 30.7 | 7.02 | 0.23 | 38.88 | 0.75 | 3.47 | 7.45 | 11.99 | |
| L58 | 4 052.20 | 17 650 | 6.34 | 25.9 | 181 | 207 | 11.2 | 3.01 | 146 | 61.7 | 61.9 | 51.3 | 2.59 | 10.8 | 497 | 1.64 | 996 | 84.9 | 0.918 | 1.76 | 54.4 | 6.64 | 41.6 | 11.7 | 57.3 | 98.2 | 22.6 | 9.14 | 0.18 | 48.32 | 0.88 | 4.35 | 8.06 | 16.16 | |
| HT7 | 4 453.13 | 143 | 8.17 | 59.5 | 206 | 171 | 17.3 | 39.6 | 130 | 82.4 | 165 | 45.4 | 1.05 | 61.5 | 474 | 1.45 | 436 | 81.7 | 0.78 | 2.20 | 169 | 8.61 | 15.2 | 6.3 | 84.7 | 88.6 | 34.8 | 2.80 | 0.47 | 3.28 | 1.20 | 2.55 | 5.75 | 5.29 | |
| HT7 | 4 456.84 | 167 | 9.90 | 45.8 | 124 | 125 | 43.2 | 17.4 | 141 | 28.4 | 46.4 | 45.8 | 1.02 | 59.5 | 513 | 0.73 | 371 | 65.8 | 0.09 | 1.99 | 152 | 7.70 | 12.1 | 7.0 | 59.7 | 79.2 | 25.8 | 3.38 | 0.33 | 8.10 | 0.99 | 3.07 | 18.08 | 13.06 | |
| C3⁃25⁃11 | 3 808.42 | 214 | 4.07 | 26.2 | 685 | 364 | 18.8 | 10.4 | 79.2 | 24.1 | 33.3 | 51.7 | 1.91 | 64.9 | 141 | 8.97 | 214 | 45.2 | <0.02 | 3.02 | 233 | 6.07 | 6.99 | 3.1 | 32.1 | 48.7 | 17.5 | 0.60 | 3.20 | 7.62 | 1.88 | 2.78 | 5.83 | 8.88 | |
| L81 | 3 910.29 | 842 | 6.08 | 30.9 | 79.8 | 103 | 32.5 | 21.1 | 91.4 | 27.5 | 43.8 | 37.1 | 1.23 | 22.9 | 138 | 3.53 | 291 | 33.8 | 0.33 | 2.77 | 210 | 4.30 | 9.10 | 2.2 | 93.1 | 44.5 | 22.6 | 0.66 | 0.27 | 4.33 | 0.77 | 1.97 | 5.00 | 10.58 | |
| L81 | 3 911.23 | 335 | 5.97 | 37.1 | 116 | 183 | 79.6 | 15.2 | 58.4 | 43.5 | 18.4 | 26.0 | 1.16 | 42.5 | 275 | 3.36 | 324 | 65.6 | <0.02 | 4.27 | 188 | 4.66 | 10.7 | 1.5 | 39.0 | 59.0 | 20.7 | 1.46 | 0.36 | 3.84 | 0.63 | 2.85 | 6.31 | 7.45 |
表2 鄂尔多斯盆地陇东地区铝土岩系典型井样品微量元素含量 (10-6,续)Table 2 Trace element contents in typical well samples of bauxite rock series in the Longdong area of the Ordos Basin (unit: 10-6,continued) |
| 井号 | 井深/m | 岩性 | Li | Be | Sc | V | Cr | Mn | Co | Ni | Cu | Zn | Ga | Ge | Rb | Sr | Mo | Zr | Nb | Cd | Cs | Ba | W | Hf | Ta | Pb | Th | U | Sr/Ba | V/Zr | Ni/Co | V/Cr | Th/U | Sr/Cu | Zr/Cu |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L58 | 4 040.62 | 铝 土 质 泥 岩 | 1 030 | 2.79 | 12.3 | 327 | 197 | 12.2 | 5.29 | 50.8 | 42.5 | 34.5 | 49.4 | 0.960 | 17.9 | 222 | 3.14 | 928 | 68.2 | 0.495 | 1.15 | 77.7 | 5.33 | 22.4 | 8.92 | 40.2 | 61.3 | 17.5 | 2.86 | 0.35 | 9.60 | 1.66 | 3.50 | 5.22 | 21.86 |
| L58 | 4 041.00 | 2 812 | 3.16 | 14.0 | 162 | 282 | 23.5 | 4.63 | 73.8 | 43.8 | 43.1 | 43.3 | 0.920 | 30.8 | 261 | 6.50 | 704 | 64.1 | 0.501 | 1.64 | 114 | 6.42 | 23.6 | 5.40 | 31.7 | 56.9 | 17.1 | 2.29 | 0.23 | 15.93 | 0.57 | 3.32 | 5.95 | 16.06 | |
| L58 | 4 053.29 | 2 732 | 4.42 | 22.1 | 184 | 190 | 19.6 | 5.79 | 61.7 | 150 | 56.6 | 38.4 | 1.48 | 159 | 312 | 0.729 | 814 | 49.8 | 0.395 | 5.70 | 434 | 4.70 | 17.4 | 5.20 | 42.0 | 50.9 | 11.5 | 0.72 | 0.23 | 10.65 | 0.97 | 4.41 | 2.07 | 5.41 | |
| L58 | 4 053.62 | 2 066 | 4.33 | 20.4 | 159 | 187 | 17.7 | 3.28 | 57.0 | 93.6 | 46.4 | 39.7 | 1.20 | 154 | 235 | 0.724 | 719 | 41.4 | 0.290 | 5.59 | 405 | 4.55 | 15.4 | 3.04 | 30.1 | 49.9 | 10.8 | 0.58 | 0.22 | 17.38 | 0.85 | 4.62 | 2.51 | 7.68 | |
| L58 | 4 053.80 | 2 505 | 4.94 | 22.4 | 163 | 279 | 30.8 | 6.46 | 120 | 108 | 44.7 | 45.1 | 1.76 | 154 | 280 | 2.45 | 801 | 47.9 | 0.329 | 6.30 | 365 | 5.14 | 17.3 | 3.19 | 19.3 | 47.7 | 12.1 | 0.77 | 0.20 | 18.54 | 0.59 | 3.95 | 2.60 | 7.45 | |
| L58 | 4 059.80 | 5 045 | 3.19 | 15.6 | 129 | 178 | 53.7 | 63.0 | 106 | 74.2 | 61.8 | 42.7 | 1.69 | 110 | 400 | 1.10 | 601 | 32.5 | 0.185 | 2.98 | 252 | 3.33 | 12.1 | 1.72 | 18.5 | 34.9 | 11.6 | 1.59 | 0.22 | 1.68 | 0.73 | 3.01 | 5.39 | 8.10 | |
| L58 | 4 059.95 | 5 556 | 3.19 | 15.7 | 136 | 162 | 30.7 | 42.4 | 90.4 | 59.4 | 38.6 | 44.0 | 1.54 | 118 | 192 | 0.625 | 611 | 28.2 | 0.237 | 3.39 | 251 | 3.00 | 11.9 | 1.40 | 14.7 | 33.2 | 11.4 | 0.76 | 0.22 | 2.13 | 0.84 | 2.93 | 3.22 | 10.28 | |
| L82 | 4 048.56 | 181 | 8.01 | 23.8 | 108 | 126 | 204 | 31.1 | 90.3 | 54.2 | 33.9 | 39.6 | 0.74 | 92.2 | 420 | 0.61 | 248 | 42.8 | 0.28 | 4.59 | 481 | 4.42 | 8.20 | 1.4 | 64.4 | 53.1 | 16.0 | 0.87 | 0.43 | 2.90 | 0.85 | 3.32 | 7.76 | 4.58 | |
| L58 | 4 033.82 | 泥 岩 | 45.6 | 2.01 | 7.56 | 71.2 | 4084 | 603 | 20.9 | 529 | 47.4 | 302 | 24.8 | 1.78 | 56.4 | 61.0 | 17.9 | 449 | 22.6 | 1.49 | 2.76 | 256 | 5.06 | 10.4 | 3.42 | 20.5 | 13.0 | 3.08 | 0.24 | 0.16 | 25.32 | 0.02 | 4.22 | 1.29 | 9.46 |
| L58 | 4 035.84 | 39.7 | 2.58 | 7.14 | 76.6 | 434 | 2046 | 14.4 | 181 | 55.7 | 207 | 26.3 | 1.05 | 83.6 | 170 | 7.12 | 410 | 20.6 | 1.03 | 4.65 | 357 | 4.01 | 9.31 | 2.95 | 15.7 | 14.1 | 2.90 | 0.48 | 0.19 | 12.59 | 0.18 | 4.84 | 3.06 | 7.37 | |
| L58 | 4 038.64 | 100 | 1.33 | 7.32 | 118 | 106 | 72.0 | 8.04 | 40.9 | 22.7 | 24.4 | 37.9 | 0.430 | 12.3 | 51.6 | 8.20 | 406 | 24.1 | 0.134 | 0.746 | 53.7 | 6.64 | 11.2 | 3.11 | 39.8 | 17.3 | 12.2 | 0.96 | 0.29 | 5.09 | 1.12 | 1.42 | 2.28 | 17.91 | |
| L58 | 4 040.00 | 557 | 1.89 | 9.57 | 162 | 182 | 14.3 | 2.05 | 17.8 | 44.8 | 32.1 | 52.8 | 0.680 | 7.17 | 152 | 1.49 | 492 | 45.1 | 0.305 | 0.52 | 44.6 | 4.36 | 18.2 | 4.21 | 20.3 | 47.1 | 14.2 | 3.42 | 0.33 | 8.70 | 0.89 | 3.32 | 3.40 | 10.99 | |
| L58 | 4 040.42 | 914 | 2.69 | 11.7 | 174 | 169 | 18.3 | 9.37 | 68.2 | 69.1 | 45.1 | 47.9 | 0.940 | 32.5 | 188 | 3.41 | 753 | 50.7 | 0.397 | 1.76 | 125 | 4.62 | 17.8 | 4.09 | 47.9 | 48.3 | 14.0 | 1.50 | 0.23 | 7.28 | 1.03 | 3.44 | 2.72 | 10.90 | |
| L58 | 4 056.00 | 8 540 | 4.11 | 15.1 | 110 | 171 | 111 | 9.09 | 126 | 71.0 | 48.4 | 45.3 | 2.97 | 69.5 | 281 | 1.44 | 861 | 37.3 | 0.485 | 2.67 | 191 | 6.87 | 16.6 | 1.78 | 29.6 | 54.6 | 13.3 | 1.47 | 0.13 | 13.88 | 0.64 | 4.09 | 3.96 | 12.13 | |
| L58 | 4 060.05 | 4 728 | 3.14 | 16.2 | 149 | 180 | 23.3 | 44.3 | 129 | 86.3 | 71.2 | 42.8 | 1.43 | 119 | 203 | 0.837 | 664 | 38.1 | 0.286 | 3.23 | 257 | 4.68 | 12.0 | 1.29 | 15.3 | 38.4 | 13.5 | 0.79 | 0.22 | 2.91 | 0.83 | 2.85 | 2.35 | 7.69 | |
| L58 | 4 070.22 | 107 | 3.12 | 9.85 | 94.1 | 146 | 21.4 | 20.3 | 42.3 | 106 | 40.8 | 37.9 | 1.03 | 161 | 275 | 0.820 | 534 | 39.2 | 0.205 | 3.67 | 266 | 2.42 | 11.3 | 4.59 | 34.5 | 36.6 | 10.2 | 1.03 | 0.18 | 2.08 | 0.64 | 3.59 | 2.59 | 5.04 | |
| L58 | 4 071.20 | 138 | 3.45 | 13.1 | 94.9 | 152 | 23.3 | 61.4 | 60.9 | 62.5 | 32.2 | 34.3 | 1.01 | 152 | 169 | 0.863 | 589 | 35.5 | 0.180 | 3.90 | 242 | 2.40 | 12.3 | 1.46 | 20.6 | 34.7 | 8.49 | 0.70 | 0.16 | 0.99 | 0.62 | 4.08 | 2.71 | 9.42 | |
| L58 | 4 071.80 | 126 | 4.07 | 12.5 | 125 | 156 | 30.7 | 14.8 | 36.8 | 128 | 66.4 | 44.0 | 1.30 | 176 | 196 | 1.66 | 654 | 35.4 | 0.378 | 5.03 | 254 | 7.86 | 13.0 | 2.29 | 23.4 | 35.4 | 10.9 | 0.77 | 0.19 | 2.48 | 0.80 | 3.26 | 1.54 | 5.12 | |
| L58 | 4 072.59 | 59.6 | 4.69 | 16.7 | 129 | 115 | 18.9 | 6.33 | 20.6 | 75.1 | 105 | 42.7 | 1.25 | 182 | 182 | 0.395 | 607 | 30.6 | 0.539 | 5.57 | 258 | 2.31 | 13.3 | 1.05 | 31.5 | 30.2 | 9.70 | 0.70 | 0.21 | 3.25 | 1.12 | 3.11 | 2.42 | 8.08 | |
| L58 | 4 073.60 | 44.2 | 5.00 | 19.0 | 143 | 130 | 21.0 | 5.74 | 21.9 | 45.9 | 51.8 | 45.3 | 1.36 | 183 | 219 | 0.302 | 803 | 43.2 | 0.429 | 5.75 | 250 | 4.19 | 15.8 | 2.64 | 9.75 | 48.1 | 14.0 | 0.88 | 0.18 | 3.81 | 1.10 | 3.44 | 4.77 | 17.49 | |
| HT7 | 4 440.50 | 60.6 | 4.55 | 18.8 | 136 | 87.9 | 44.1 | 5.0 | 25.4 | 28.4 | 29.3 | 36.6 | 1.32 | 143 | 101 | 1.78 | 156 | 14.1 | 0.10 | 14.6 | 365 | 3.39 | 4.79 | 0.7 | 15.1 | 18.5 | 6.51 | 0.28 | 0.87 | 5.07 | 1.55 | 2.84 | 3.54 | 5.49 | |
| HT7 | 4 457.81 | 516 | 8.18 | 37.3 | 150 | 88.3 | 32.4 | 20.8 | 248 | 35.9 | 129 | 37.4 | 0.77 | 133 | 320 | 0.74 | 192 | 32.9 | 0.71 | 3.89 | 356 | 3.55 | 6.27 | 3.6 | 39.6 | 43.8 | 18.6 | 0.90 | 0.78 | 11.92 | 1.70 | 2.35 | 8.92 | 5.35 | |
| L58 | 4 039.22 | 铁 质 泥 岩 | 163 | 3.00 | 11.8 | 228 | 220 | 45.6 | 9.96 | 70.6 | 74.6 | 47.9 | 35.8 | 0.810 | 48.4 | 132 | 17.2 | 718 | 38.1 | 0.700 | 2.84 | 148 | 4.07 | 15.2 | 3.11 | 145 | 41.2 | 16.6 | 0.89 | 0.32 | 7.09 | 1.04 | 2.48 | 1.77 | 9.62 |
| HT7 | 4 440.20 | 73.4 | 3.47 | 25.0 | 115 | 15.4 | 82.5 | 13.2 | 61.3 | 26.4 | 23.4 | 36.5 | 0.39 | 24.9 | 238 | 5.42 | 268 | 16.1 | 0.18 | 1.51 | 78.8 | 2.25 | 10.1 | 8.6 | 48.7 | 20.7 | 14.5 | 3.02 | 0.43 | 4.64 | 7.45 | 1.43 | 9.01 | 10.15 | |
| C3⁃25⁃11 | 3 795.08 | 175 | 14.8 | 35.9 | 152 | 135 | 58.9 | 26.6 | 90.1 | 46.9 | 153 | 46.2 | 3.37 | 86.8 | 221 | 0.97 | 287 | 53.4 | 0.05 | 4.55 | 229 | 6.52 | 8.89 | 3.3 | 30.6 | 60.6 | 17.5 | 0.96 | 0.53 | 3.39 | 1.12 | 3.46 | 4.71 | 6.12 | |
| HT1 | 4 458.49 | 366 | 6.94 | 36.9 | 167 | 148 | 938 | 17.8 | 79.5 | 74.2 | 29.6 | 38.8 | 0.78 | 20.0 | 401 | 1.20 | 242 | 44.2 | 0.08 | 1.12 | 130 | 4.48 | 7.72 | 1.7 | 60.2 | 51.4 | 27.7 | 3.08 | 0.69 | 4.47 | 1.13 | 1.86 | 5.40 | 3.26 | |
| L82 | 4 041.47 | 162 | 5.90 | 32.8 | 118 | 140 | 1020 | 66.1 | 108 | 123 | 26.5 | 39.7 | 0.89 | 36.1 | 585 | 1.02 | 316 | 42.3 | 0.04 | 2.26 | 159 | 5.06 | 10.3 | 1.8 | 88.0 | 62.7 | 24.5 | 3.67 | 0.37 | 1.63 | 0.84 | 2.56 | 4.76 | 2.57 | |
| L82 | 4 044.30 | 229 | 8.81 | 35.8 | 129 | 147 | 230 | 34.3 | 108 | 66.1 | 28.6 | 35.2 | 0.97 | 58.7 | 283 | 0.72 | 296 | 63.7 | <0.02 | 3.49 | 219 | 5.53 | 9.89 | 3.0 | 45.0 | 59.1 | 14.8 | 1.29 | 0.43 | 3.15 | 0.87 | 3.99 | 4.28 | 4.48 |
3.1.3 稀土元素
表3 鄂尔多斯盆地陇东地区铝土岩系典型井样品稀土元素含量 (10-6)Table 3 Rare earth element contents in typical well samples of bauxite rock series in the Longdong area of the Ordos Basin |
| 井号 | 井深/m | 岩性 | La | Ce | Pr | Nd | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | ∑REE | ∑LREE | ∑HREE | L/H | (La/Yb)N | (La/Sm)N | (Gd/Yb)N | δEu | δCe |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L58 | 4 045.24 | 铝土岩 | 40.1 | 71.9 | 8.84 | 30.4 | 6.24 | 1.34 | 5.18 | 1.02 | 6.15 | 1.25 | 3.44 | 0.563 | 3.20 | 0.569 | 180.19 | 158.82 | 21.37 | 7.43 | 9.00 | 4.15 | 1.34 | 0.70 | 0.90 |
| L58 | 4 045.55 | 79.7 | 126 | 17.3 | 54.3 | 9.95 | 1.60 | 9.96 | 1.99 | 12.4 | 2.40 | 6.35 | 1.038 | 5.96 | 1.04 | 329.72 | 288.58 | 41.13 | 7.02 | 9.59 | 5.17 | 1.38 | 0.49 | 0.79 | |
| L58 | 4 045.90 | 55.0 | 95.5 | 12.1 | 39.9 | 8.48 | 1.43 | 8.06 | 1.78 | 11.3 | 2.17 | 5.68 | 0.928 | 5.29 | 0.912 | 248.63 | 212.48 | 36.15 | 5.88 | 7.46 | 4.19 | 1.26 | 0.52 | 0.87 | |
| L58 | 4 047.10 | 80.0 | 296 | 15.1 | 47.3 | 10.3 | 1.73 | 9.42 | 1.39 | 7.56 | 1.44 | 3.98 | 0.638 | 3.79 | 0.650 | 479.84 | 450.97 | 28.87 | 15.62 | 15.16 | 5.00 | 2.06 | 0.53 | 1.95 | |
| L58 | 4 047.82 | 271 | 552 | 42.6 | 95.4 | 13.7 | 2.48 | 20.0 | 2.14 | 10.8 | 2.13 | 6.25 | 0.988 | 5.89 | 1.01 | 1 025.72 | 976.52 | 49.20 | 19.85 | 32.93 | 12.73 | 2.81 | 0.46 | 1.13 | |
| HT7 | 4 444.57 | 221 | 598 | 49.5 | 171 | 35.8 | 7.96 | 31.2 | 4.58 | 21.4 | 3.91 | 10.3 | 1.51 | 9.53 | 1.39 | 1 167.08 | 1 083.26 | 83.82 | 12.92 | 16.63 | 3.99 | 2.71 | 0.71 | 1.34 | |
| HT7 | 4 447.11 | 113 | 315 | 23.0 | 80.1 | 18.0 | 4.12 | 17.7 | 3.12 | 16.6 | 3.19 | 8.49 | 1.24 | 7.51 | 1.11 | 612.18 | 553.22 | 58.96 | 9.38 | 10.79 | 4.05 | 1.95 | 0.70 | 1.43 | |
| HT7 | 4 448.81 | 146 | 517 | 33.3 | 120 | 28.9 | 6.25 | 23.9 | 3.53 | 17.5 | 3.38 | 9.07 | 1.33 | 8.32 | 1.20 | 919.68 | 851.45 | 68.23 | 12.48 | 12.59 | 3.26 | 2.38 | 0.71 | 1.75 | |
| HT7 | 4 450.07 | 154 | 288 | 36.0 | 134 | 26.8 | 5.51 | 21.5 | 3.35 | 16.4 | 3.18 | 8.67 | 1.27 | 8.04 | 1.10 | 707.82 | 644.31 | 63.51 | 10.15 | 13.74 | 3.71 | 2.21 | 0.68 | 0.91 | |
| HT7 | 4 451.17 | 207 | 538 | 49.3 | 183 | 37.0 | 7.06 | 25.0 | 3.30 | 15.2 | 2.97 | 8.05 | 1.19 | 7.53 | 1.09 | 1 085.69 | 1 021.36 | 64.33 | 15.88 | 19.72 | 3.61 | 2.75 | 0.67 | 1.26 | |
| HT7 | 4 451.95 | 148 | 311 | 28.5 | 93.7 | 18.2 | 3.83 | 15.9 | 2.82 | 15.8 | 3.25 | 8.96 | 1.34 | 8.17 | 1.17 | 660.64 | 603.23 | 57.41 | 10.51 | 12.99 | 5.25 | 1.61 | 0.67 | 1.10 | |
| HT7 | 4 455.21 | 84.7 | 226 | 19.3 | 70.4 | 13.8 | 2.47 | 10.9 | 2.08 | 12.5 | 2.76 | 8.02 | 1.29 | 8.07 | 1.16 | 463.45 | 416.67 | 46.78 | 8.91 | 7.53 | 3.96 | 1.12 | 0.59 | 1.32 | |
| HT7 | 4 455.90 | 93.7 | 199 | 21.6 | 78.8 | 14.9 | 2.63 | 11.3 | 2.14 | 13.1 | 2.92 | 8.70 | 1.43 | 9.16 | 1.32 | 460.70 | 410.63 | 50.07 | 8.20 | 7.34 | 4.06 | 1.02 | 0.60 | 1.04 | |
| C3⁃25⁃11 | 3 806.65 | 32.2 | 118 | 6.65 | 23.2 | 4.92 | 1.05 | 5.24 | 1.27 | 8.55 | 1.81 | 5.09 | 0.80 | 4.92 | 0.71 | 214.41 | 186.02 | 28.39 | 6.55 | 4.69 | 4.23 | 0.88 | 0.63 | 1.87 | |
| C3⁃25⁃11 | 3 807.40 | 51.4 | 158 | 10.2 | 34.0 | 6.51 | 1.35 | 6.64 | 1.58 | 10.2 | 2.19 | 6.15 | 0.95 | 6.07 | 0.86 | 296.11 | 261.46 | 34.65 | 7.55 | 6.07 | 5.10 | 0.90 | 0.62 | 1.59 | |
| L58 | 4 041.17 | 泥质铝土岩 | 54.3 | 87.4 | 10.6 | 33.0 | 5.56 | 1.23 | 5.57 | 1.04 | 6.74 | 1.32 | 3.55 | 0.560 | 3.21 | 0.561 | 214.46 | 191.92 | 22.55 | 8.51 | 12.13 | 6.30 | 1.44 | 0.67 | 0.84 |
| L58 | 4 041.74 | 57.9 | 126 | 12.8 | 44.9 | 12.6 | 2.66 | 11.3 | 2.14 | 10.2 | 1.61 | 3.91 | 0.572 | 3.56 | 0.611 | 290.79 | 256.93 | 33.86 | 7.59 | 11.67 | 2.98 | 2.63 | 0.67 | 1.09 | |
| L58 | 4 042.82 | 80.2 | 184 | 34.6 | 119 | 19.4 | 1.95 | 14.7 | 2.48 | 14.6 | 2.83 | 8.12 | 1.30 | 7.71 | 1.27 | 491.93 | 438.90 | 53.03 | 8.28 | 7.45 | 2.67 | 1.58 | 0.34 | 0.85 | |
| L58 | 4 044.63 | 95.7 | 139 | 22.9 | 70.2 | 8.51 | 0.667 | 8.73 | 1.07 | 5.26 | 1.12 | 3.65 | 0.605 | 3.56 | 0.610 | 361.40 | 336.80 | 24.60 | 13.69 | 19.28 | 7.26 | 2.03 | 0.23 | 0.70 | |
| L58 | 4 051.10 | 586 | 590 | 68.9 | 193 | 27.8 | 3.59 | 29.2 | 3.24 | 15.3 | 3.03 | 9.51 | 1.43 | 8.48 | 1.43 | 1 541.26 | 1 469.65 | 71.61 | 20.52 | 49.54 | 13.58 | 2.85 | 0.38 | 0.60 | |
| L58 | 4 051.71 | 249 | 494 | 64.7 | 209 | 24.8 | 3.06 | 26.8 | 3.38 | 17.1 | 3.52 | 11.2 | 1.76 | 10.8 | 1.84 | 1 120.56 | 1 044.28 | 76.28 | 13.69 | 16.63 | 6.49 | 2.06 | 0.36 | 0.93 | |
| L58 | 4 052.20 | 219 | 591 | 84.2 | 256 | 29.6 | 3.73 | 32.2 | 3.40 | 14.2 | 2.90 | 9.81 | 1.49 | 9.15 | 1.62 | 1 258.37 | 1 183.61 | 74.76 | 15.83 | 17.15 | 4.76 | 2.91 | 0.37 | 1.07 | |
| HT7 | 4 453.13 | 181 | 386 | 44.3 | 160 | 28.2 | 4.68 | 18.1 | 2.96 | 16.2 | 3.48 | 10.2 | 1.60 | 10.2 | 1.45 | 868.37 | 804.18 | 64.19 | 12.53 | 12.73 | 4.14 | 1.47 | 0.59 | 1.03 | |
| HT7 | 4 456.84 | 189 | 330 | 45.5 | 181 | 41.1 | 6.82 | 27.2 | 4.75 | 26.8 | 5.61 | 15.7 | 2.36 | 14.9 | 2.22 | 892.96 | 793.42 | 99.54 | 7.97 | 9.10 | 2.97 | 1.51 | 0.59 | 0.84 | |
| L81 | 3 910.29 | 84.1 | 228 | 32.7 | 131 | 24.3 | 3.01 | 16.6 | 2.63 | 13.0 | 2.44 | 6.56 | 0.98 | 6.07 | 0.88 | 552.27 | 503.11 | 49.16 | 10.23 | 9.94 | 2.23 | 2.26 | 0.43 | 1.07 | |
| L81 | 3 911.23 | 107 | 292 | 25.1 | 83.8 | 13.0 | 2.51 | 9.81 | 1.68 | 9.86 | 2.14 | 6.48 | 1.07 | 7.01 | 0.99 | 562.45 | 523.41 | 39.04 | 13.41 | 10.95 | 5.31 | 1.16 | 0.65 | 1.33 |
表3 鄂尔多斯盆地陇东地区铝土岩系典型井样品稀土元素含量 (10-6,续)Table 3 Rare earth element contents in typical well samples of bauxite rock series in the Longdong area of the Ordos Basin(unit: 10-6,continued) |
| 井号 | 井深/m | 岩性 | La | Ce | Pr | Nd | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | ∑REE | ∑LREE | ∑HREE | L/H | (La/Yb)N | (La/Sm)N | (Gd/Yb)N | δEu | δCe |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L58 | 4 040.62 | 铝土质泥岩 | 75.8 | 403 | 15.6 | 46.5 | 7.32 | 1.47 | 7.68 | 1.11 | 6.40 | 1.32 | 3.82 | 0.650 | 4.00 | 0.691 | 574.82 | 549.16 | 25.66 | 21.40 | 13.60 | 6.68 | 1.59 | 0.59 | 2.72 |
| L58 | 4 041.00 | 74.2 | 235 | 15.1 | 47.2 | 7.94 | 1.71 | 7.69 | 1.25 | 7.28 | 1.45 | 4.08 | 0.657 | 3.95 | 0.675 | 408.25 | 381.22 | 27.04 | 14.10 | 13.47 | 6.03 | 1.61 | 0.66 | 1.63 | |
| L58 | 4 053.29 | 173 | 308 | 47.6 | 177 | 33.3 | 5.25 | 29.1 | 6.52 | 43.2 | 8.82 | 23.3 | 3.60 | 19.9 | 3.37 | 881.41 | 743.71 | 137.70 | 5.40 | 6.24 | 3.35 | 1.21 | 0.50 | 0.82 | |
| L58 | 4 053.62 | 125 | 263 | 31.5 | 120 | 25.0 | 3.92 | 19.8 | 4.05 | 25.4 | 5.07 | 13.6 | 2.12 | 12.0 | 2.09 | 652.55 | 568.42 | 84.13 | 6.76 | 7.47 | 3.23 | 1.36 | 0.52 | 1.00 | |
| L58 | 4 053.80 | 143 | 283 | 33.6 | 118 | 23.1 | 3.63 | 19.7 | 3.65 | 22.5 | 4.57 | 12.5 | 2.00 | 11.3 | 1.98 | 682.53 | 604.39 | 78.14 | 7.73 | 9.10 | 4.00 | 1.44 | 0.51 | 0.96 | |
| L58 | 4 059.80 | 86.4 | 171 | 20.8 | 70.0 | 12.3 | 1.92 | 10.1 | 1.48 | 7.41 | 1.49 | 4.51 | 0.745 | 4.68 | 0.872 | 393.88 | 362.58 | 31.30 | 11.58 | 13.22 | 4.54 | 1.79 | 0.51 | 0.96 | |
| L58 | 4 059.95 | 79.6 | 187 | 18.9 | 64.8 | 12.0 | 1.78 | 9.52 | 1.29 | 6.44 | 1.35 | 4.18 | 0.695 | 4.53 | 0.808 | 392.95 | 364.14 | 28.81 | 12.64 | 12.61 | 4.30 | 1.74 | 0.49 | 1.14 | |
| L82 | 4 048.56 | 109 | 245 | 29.8 | 114 | 24.7 | 4.63 | 17.2 | 2.41 | 12.4 | 2.56 | 7.34 | 1.15 | 7.31 | 1.04 | 578.54 | 527.13 | 51.41 | 10.25 | 10.70 | 2.85 | 1.95 | 0.65 | 1.03 | |
| L58 | 4 033.82 | 泥岩 | 56.7 | 106 | 12.1 | 39.2 | 4.79 | 0.643 | 4.98 | 0.706 | 4.07 | 0.899 | 2.80 | 0.490 | 2.93 | 0.549 | 237.04 | 219.62 | 17.43 | 12.60 | 13.88 | 7.65 | 1.41 | 0.40 | 0.95 |
| L58 | 4 035.84 | 63.6 | 129 | 15.2 | 53.1 | 9.95 | 2.12 | 8.58 | 1.35 | 7.12 | 1.36 | 3.73 | 0.574 | 3.56 | 0.593 | 300.20 | 273.34 | 26.87 | 10.17 | 12.81 | 4.12 | 1.99 | 0.68 | 0.99 | |
| L58 | 4 038.64 | 56.0 | 254 | 12.8 | 42.7 | 6.12 | 0.476 | 5.22 | 0.667 | 3.24 | 0.681 | 2.09 | 0.336 | 2.06 | 0.367 | 386.63 | 371.97 | 14.66 | 25.38 | 19.46 | 5.90 | 2.09 | 0.25 | 2.24 | |
| L58 | 4 040.42 | 70.1 | 291 | 14.9 | 45.7 | 7.11 | 1.34 | 6.87 | 0.998 | 5.42 | 1.12 | 3.38 | 0.552 | 3.52 | 0.615 | 452.58 | 430.11 | 22.47 | 19.14 | 14.28 | 6.36 | 1.61 | 0.58 | 2.10 | |
| L58 | 4 056.00 | 138 | 286 | 35.7 | 119 | 20.8 | 3.02 | 17.3 | 2.04 | 9.40 | 1.96 | 6.31 | 1.06 | 6.59 | 1.18 | 648.62 | 602.73 | 45.89 | 13.14 | 15.01 | 4.29 | 2.18 | 0.47 | 0.98 | |
| L58 | 4 060.05 | 80.3 | 177 | 18.7 | 63.9 | 11.2 | 1.69 | 9.21 | 1.25 | 6.52 | 1.40 | 4.52 | 0.763 | 4.83 | 0.919 | 382.53 | 353.12 | 29.41 | 12.01 | 11.93 | 4.62 | 1.58 | 0.49 | 1.08 | |
| L58 | 4 071.80 | 102 | 215 | 25.0 | 87.8 | 14.8 | 2.00 | 11.2 | 1.48 | 8.45 | 1.82 | 5.73 | 0.929 | 5.68 | 0.955 | 482.46 | 446.21 | 36.25 | 12.31 | 12.83 | 4.42 | 1.63 | 0.45 | 1.01 | |
| L58 | 4 072.59 | 98.0 | 192 | 23.4 | 82.1 | 14.1 | 1.96 | 10.6 | 1.43 | 7.99 | 1.75 | 5.45 | 0.884 | 5.33 | 0.927 | 445.52 | 411.20 | 34.32 | 11.98 | 13.19 | 4.49 | 1.64 | 0.47 | 0.95 | |
| L58 | 4 073.60 | 123 | 235 | 29.7 | 104 | 17.9 | 2.46 | 13.8 | 1.95 | 11.7 | 2.61 | 7.88 | 1.28 | 7.61 | 1.34 | 559.68 | 511.45 | 48.23 | 10.61 | 11.56 | 4.43 | 1.50 | 0.46 | 0.93 | |
| HT7 | 4 440.50 | 57.5 | 116 | 14.5 | 53.2 | 8.57 | 1.21 | 5.78 | 1.05 | 6.08 | 1.37 | 4.02 | 0.63 | 4.09 | 0.62 | 274.62 | 250.98 | 23.64 | 10.61 | 10.08 | 4.33 | 1.17 | 0.50 | 0.96 | |
| HT7 | 4 457.81 | 106 | 190 | 25.7 | 99.0 | 22.1 | 5.21 | 24.3 | 4.62 | 23.9 | 4.66 | 12.4 | 1.75 | 10.5 | 1.50 | 531.64 | 448.01 | 83.63 | 5.36 | 7.24 | 3.10 | 1.91 | 0.68 | 0.87 | |
| L58 | 4 039.22 | 铁质泥岩 | 93.9 | 186 | 20.5 | 66.1 | 10.0 | 1.49 | 9.39 | 1.17 | 5.76 | 1.19 | 3.77 | 0.620 | 3.88 | 0.698 | 404.46 | 377.98 | 26.48 | 14.28 | 17.36 | 6.07 | 2.00 | 0.46 | 0.99 |
| HT7 | 4 440.20 | 102 | 216 | 30.3 | 131 | 33.0 | 5.17 | 19.7 | 2.82 | 13.9 | 2.76 | 7.47 | 1.07 | 6.66 | 1.05 | 572.90 | 517.47 | 55.43 | 9.34 | 10.99 | 2.00 | 2.45 | 0.57 | 0.94 | |
| HT1 | 4 458.49 | 116 | 294 | 22.9 | 79.5 | 14.6 | 3.12 | 11.8 | 2.01 | 11.0 | 2.34 | 6.74 | 1.10 | 7.12 | 1.02 | 573.25 | 530.12 | 43.13 | 12.29 | 11.69 | 5.13 | 1.37 | 0.70 | 1.32 | |
| L82 | 4 041.47 | 230 | 437 | 60.0 | 207 | 31.0 | 5.40 | 22.6 | 3.51 | 18.0 | 3.69 | 10.4 | 1.59 | 9.86 | 1.43 | 1041.48 | 970.40 | 71.08 | 13.65 | 16.73 | 4.79 | 1.90 | 0.60 | 0.89 | |
| L82 | 4 044.30 | 158 | 302 | 41.7 | 152 | 32.8 | 6.26 | 24.1 | 4.22 | 23.3 | 4.63 | 13.1 | 2.02 | 13.0 | 1.86 | 778.99 | 692.76 | 86.23 | 8.03 | 8.72 | 3.11 | 1.53 | 0.65 | 0.89 |
|
3.2 元素变化规律
3.2.1 常量元素
3.2.2 微量元素
3.2.3 稀土元素
4 讨论
表4 沉积环境元素判别指标(据文献[15⁃29])Table 4 Identification indicators of sedimentary environment elements(according to Refs.[15⁃29]) |
| 指标 | 沉积环境 | |||
|---|---|---|---|---|
| 海相 | 过渡相 | 陆相 | ||
| Th/10-6 | <5 | 5~20 | >20 | |
| Sr/10-6 | 800~1 000 | 300~800 | 100~300 | |
| Ba/10-6 | >400 | 300~400 | <300 | |
| Sr/Ba | >1 | 0.6~1 | <0.6 | |
| V/Zr | 0.50~4.0 | ⁃ | <0.50 | |
| 指标 | 氧化还原环境 | |||
| 氧化 | 贫氧 | 厌氧 | ||
| Ni/Co | <5 | 5~7 | >7 | |
| V/Cr | <2 | 2~4.25 | >4.25 | |
| Th/U | >7 | 2~7 | <2 | |
| δCe | >1 | <1 | ||
| 指标 | 温湿气候 | 干燥气候 | ||
| Sr/Cu | 1~10 | >10 | ||
| 指标 | 化学风化强度 | 气候条件 | ||
| CIA/% | 50~65 | 低 | 寒冷 | |
| 65~85 | 中 | 温暖湿润 | ||
| 85~100 | 高 | 炎热潮湿 | ||
4.1 沉积环境
4.2 成岩环境
4.3 成因分析
5 结论
(2)研究区铝土岩系中的微量元素活动行为反映了湿热气候条件下,海侵海退周期频繁、氧化还原环境交替出现的成岩环境,Th/U值及Be元素揭示研究区铝土岩以风化—沉积成因为主,局部地段具残积成矿的特点。化学蚀变指数(CIA)反映了研究区铝土岩系高化学风化强度和温湿—热湿的气候环境,也反映出铝土岩赋在的中间部位风化程度高,而上部和下部泥岩风化程度相对较低。多项地球化学指标显示研究区铝土岩系主要以陆相淡水沉积环境为主,并有过渡相和海相沉积的特征。

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