Research Article
Geochemical Mass Balance and Elemental Transport during the Weathering of the Black Shale of Shuijingtuo Formation in Northeast Chongqing, China
Table 1
Major element concentration, bulk densities, strain values, and corresponding Tau values for black shale from profile A, B, and C in study area.
| Sample No. | Depth (m) | ρ (g/cm3) | SiO2 (%) | Al2O3 (%) | TFe2O3 (%) | K2O (%) | Na2O (%) | CaO (%) | MgO (%) | MnO (%) | P2O5 (%) | BaO (%) | SO3 (%) | LOI (%) | Ti (ppm) | pH | | | Si | Al | Fe | K | Na | Ca | Mg |
| A-1 | 0.1 | 1.53 | 65.5 | 13.60 | 8.10 | 2.84 | 2.52 | 0.29 | 0.97 | 0.22 | 0.20 | 0.53 | 0.23 | 4.39 | 4970 | 6.03 | 0.63 | 0.18 | 0.09 | −0.23 | 0.01 | 0.07 | −0.93 | −0.63 | A-2 | 0.25 | 1.79 | 65.7 | 13.70 | 7.78 | 2.87 | 2.63 | 0.28 | 0.96 | 0.05 | 0.25 | 0.47 | 0.30 | 4.41 | 5275 | 4.25 | 0.31 | 0.11 | 0.03 | −0.31 | −0.03 | 0.05 | −0.93 | −0.66 | A-3 | 0.45 | 1.72 | 63.4 | 13.85 | 9.08 | 2.91 | 2.59 | 0.22 | 0.98 | 0.27 | 0.28 | 0.37 | 1.03 | 4.97 | 5138 | 3.28 | 0.40 | 0.10 | 0.07 | −0.17 | 0.01 | 0.06 | −0.95 | −0.64 | A-4 | 0.55 | 1.92 | 69.8 | 14.60 | 1.35 | 3.13 | 2.74 | 0.19 | 1.09 | 0.01 | 0.03 | 0.28 | 1.10 | 5.69 | 5271 | 2.82 | 0.22 | 0.18 | 0.10 | −0.88 | 0.05 | 0.09 | −0.96 | −0.61 | A-5 | 0.65 | 1.90 | 69.1 | 14.25 | 1.38 | 3.02 | 2.79 | 0.36 | 1.02 | BDL | 0.02 | 0.26 | 1.78 | 7.33 | 5818 | 2.68 | 0.12 | 0.06 | −0.03 | −0.89 | −0.08 | 0.01 | −0.92 | −0.67 | A-6 | 0.75 | 1.98 | 67.8 | 14.20 | 1.63 | 3.05 | 2.94 | 0.19 | 0.96 | BDL | 0.02 | 0.29 | 3.36 | 8.21 | 5657 | 3.40 | 0.10 | 0.07 | 0.00 | −0.86 | −0.04 | 0.09 | −0.96 | −0.68 | A-7 | 0.85 | 2.22 | 62.6 | 13.35 | 3.97 | 2.93 | 2.56 | 1.58 | 1.20 | 0.02 | 0.09 | 0.46 | 7.26 | 8.56 | 5340 | 4.24 | 0.04 | 0.05 | −0.01 | −0.65 | −0.03 | 0.01 | −0.64 | −0.58 | A-8 | 1.1 | 2.42 | 55.7 | 11.70 | 4.93 | 2.51 | 2.28 | 5.94 | 2.16 | 0.05 | 0.17 | 0.32 | 8.31 | 10.64 | 5017 | 5.88 | 0.02 | −0.01 | −0.07 | −0.54 | −0.11 | −0.04 | 0.46 | −0.19 | A-9 | 1.5 | 2.50 | 49.6 | 10.60 | 12.06 | 2.36 | 1.94 | 5.05 | 1.72 | 0.04 | 0.14 | 0.28 | 8.70 | 11.06 | 4767 | 6.12 | 0.04 | −0.07 | −0.12 | 0.19 | −0.12 | −0.14 | 0.30 | −0.32 | A-10 | 2.1 | 2.61 | 57.2 | 11.10 | 4.45 | 2.41 | 2.08 | 6.79 | 1.72 | 0.05 | 0.15 | 0.37 | 7.75 | 10.94 | 4859 | 6.88 | −0.02 | 0.05 | −0.09 | −0.57 | −0.12 | −0.10 | 0.72 | −0.34 | A-11 | 3.0 | 2.65 | 52.3 | 11.75 | 9.93 | 2.63 | 2.22 | 3.80 | 2.49 | 0.05 | 0.18 | 0.33 | 6.25 | 10.76 | 4670 | 6.52 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| B-1 | 0.5 | 1.67 | 69.7 | 9.85 | 3.92 | 2.06 | 0.66 | 3.48 | 1.20 | 0.02 | 1.34 | 1.02 | 0.40 | 5.02 | 3542 | 7.04 | 0.34 | −0.06 | 0.00 | 0.04 | −0.13 | −0.66 | −0.28 | −0.17 | B-2 | 1.0 | 1.90 | 69.9 | 6.98 | 2.87 | 1.62 | 0.56 | 3.65 | 0.94 | 0.01 | 0.60 | 0.65 | 0.26 | 8.80 | 2486 | 6.55 | 0.67 | 0.35 | 0.01 | 0.09 | −0.03 | −0.59 | 0.08 | −0.07 | B-3 | 1.5 | 1.88 | 67.4 | 8.76 | 3.49 | 2.09 | 0.42 | 2.85 | 1.30 | 0.02 | 0.65 | 1.60 | 0.70 | 11.70 | 3234 | 6.62 | 0.30 | 0.00 | −0.02 | 0.02 | −0.03 | −0.76 | −0.35 | −0.01 | B-4 | 2.0 | 1.75 | 74.7 | 9.34 | 3.50 | 2.16 | 1.41 | 0.66 | 0.86 | BDL | 0.15 | 0.48 | 0.33 | 5.91 | 4355 | 6.20 | 0.04 | −0.18 | −0.23 | −0.24 | −0.26 | −0.40 | −0.89 | −0.52 | B-5 | 2.5 | 1.82 | 67.2 | 11.75 | 3.72 | 2.80 | 0.55 | 0.77 | 1.52 | 0.01 | 0.17 | 1.66 | 0.86 | 8.09 | 3834 | 6.02 | 0.13 | −0.16 | 0.11 | −0.09 | 0.09 | −0.74 | −0.85 | −0.03 | B-6 | 3.2 | 1.72 | 66.0 | 12.10 | 5.94 | 2.80 | 1.96 | 0.12 | 1.03 | 0.01 | 0.12 | 0.41 | 8.24 | 8.88 | 4275 | 4.43 | 0.08 | −0.26 | 0.02 | 0.31 | −0.02 | −0.16 | −0.98 | −0.41 | B-7 | 4.0 | 1.98 | 60.8 | 10.25 | 3.55 | 2.51 | 1.29 | 5.76 | 1.70 | 0.03 | 0.17 | 0.95 | 5.93 | 10.11 | 3764 | 6.50 | 0.06 | −0.22 | −0.02 | −0.11 | 0.00 | −0.37 | 0.13 | 0.11 | B-8 | 4.8 | 2.14 | 59.7 | 13.00 | 4.42 | 3.11 | 1.84 | 3.74 | 2.04 | 0.03 | 0.20 | 0.52 | 7.00 | 9.01 | 4916 | 6.38 | −0.24 | −0.42 | −0.05 | −0.15 | −0.05 | −0.31 | −0.44 | 0.02 | B-9 | 5.5 | 2.21 | 59.4 | 13.35 | 4.13 | 3.06 | 2.01 | 3.56 | 2.09 | 0.03 | 0.20 | 0.46 | 6.47 | 9.01 | 5010 | 6.51 | −0.28 | −0.43 | −0.04 | −0.22 | −0.09 | −0.26 | −0.48 | 0.02 | B-10 | 6.2 | 2.38 | 59.7 | 13.35 | 4.13 | 3.01 | 2.29 | 4.00 | 1.94 | 0.04 | 0.19 | 0.50 | 5.83 | 8.37 | 4886 | 6.80 | −0.32 | −0.41 | −0.01 | −0.20 | −0.08 | −0.14 | −0.40 | −0.03 | B-11 | 7.0 | 2.50 | 66.0 | 8.77 | 3.36 | 2.12 | 1.72 | 4.30 | 1.29 | 0.02 | 0.17 | 0.37 | 5.34 | 9.30 | 3167 | 7.12 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| C-1 | 0.5 | 1.56 | 65.5 | 15.30 | 2.73 | 2.87 | 0.23 | 2.73 | 2.03 | 0.22 | 0.79 | 0.20 | 0.18 | 8.99 | 6345 | 6.54 | −0.44 | −0.58 | 0.07 | −0.71 | −0.22 | −0.62 | −0.94 | −0.75 | C-2 | 1.0 | 1.49 | 70.5 | 16.60 | 1.33 | 3.19 | 0.30 | 0.31 | 0.74 | 0.02 | 0.04 | 0.83 | 0.30 | 5.01 | 5611 | 6.40 | −0.34 | −0.49 | 0.31 | −0.84 | −0.02 | −0.44 | −0.99 | −0.90 | C-3 | 1.5 | 1.35 | 69.8 | 16.70 | 0.87 | 3.38 | 0.23 | 0.41 | 0.77 | 0.01 | 0.03 | 0.59 | 0.18 | 5.84 | 5693 | 6.16 | −0.29 | −0.50 | 0.30 | −0.90 | 0.02 | −0.57 | −0.99 | −0.90 | C-4 | 2.0 | 1.43 | 68.7 | 17.50 | 1.48 | 3.55 | 0.21 | 0.31 | 0.86 | 0.01 | 0.04 | 0.55 | 0.16 | 5.42 | 5689 | 6.35 | −0.32 | −0.51 | 0.37 | −0.82 | 0.08 | −0.61 | −0.99 | −0.88 | C-5 | 3.0 | 1.57 | 63.9 | 15.85 | 4.82 | 3.28 | 0.20 | 0.37 | 0.77 | 0.01 | 0.04 | 0.61 | 4.16 | 9.26 | 6329 | 3.85 | −0.48 | −0.59 | 0.11 | −0.48 | −0.11 | −0.67 | −0.99 | −0.91 | C-6 | 4.0 | 1.79 | 60.5 | 15.20 | 6.73 | 3.08 | 0.20 | 0.63 | 1.02 | 0.14 | 0.14 | 0.63 | 5.25 | 10.60 | 4867 | 3.70 | −0.37 | −0.49 | 0.39 | −0.06 | 0.09 | −0.57 | −0.98 | −0.84 | C-7 | 5.0 | 1.71 | 58.8 | 14.20 | 7.09 | 2.81 | 0.18 | 0.94 | 1.18 | 0.30 | 0.10 | 0.79 | 6.00 | 10.45 | 4643 | 4.74 | −0.30 | −0.48 | 0.36 | 0.04 | 0.04 | −0.59 | −0.97 | −0.80 | C-8 | 6.2 | 1.86 | 56.9 | 14.85 | 9.91 | 3.02 | 0.20 | 0.35 | 0.78 | 0.03 | 0.08 | 0.46 | 6.10 | 11.61 | 4627 | 4.65 | −0.36 | −0.50 | 0.42 | 0.46 | 0.13 | −0.54 | −0.99 | −0.87 | C-9 | 8.0 | 1.90 | 55.3 | 6.87 | 2.46 | 1.79 | 0.17 | 6.80 | 1.30 | 0.02 | 3.90 | 0.46 | 4.07 | 13.89 | 5055 | 6.83 | −0.42 | −0.55 | −0.40 | −0.67 | −0.39 | −0.65 | −0.76 | −0.80 | C-10 | 9.0 | 2.45 | 53.6 | 6.45 | 2.71 | 1.66 | 0.18 | 8.00 | 1.84 | 0.02 | 1.74 | 0.35 | 4.18 | 17.53 | 2831 | 7.22 | −0.20 | −0.23 | 0.01 | −0.35 | 0.01 | −0.33 | −0.53 | −0.50 | C-11 | 10.5 | 2.74 | 49.1 | 4.51 | 2.94 | 1.16 | 0.19 | 13.5 | 2.60 | 0.01 | 2.90 | 0.35 | 2.77 | 19.32 | 2002 | 7.26 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | UCC | | | 66.0 | 15.20 | 5.00 | 3.40 | 3.90 | 4.20 | 2.20 | 0.06 | 0.50 | | | | | | | | | | | | | |
|
|
Note: BDL, below detection limit: <0.01%.
|