# Provenance and Paleo-Environment of the Late Carboniferous Bauxite Formations in Southern Shanxi
## 4 Result
### 4.3. Geochemical Characteristics of Elements
#### 4.3.1 Major Elements
The CIA values for the stable overlying sandstone layers in both profiles were below 90.58 (S3). In the Jinshi profile, the bauxite was directly overlain by coal seams, with CIA values exceeding 99.09, while the CIA values of the bottom layers were notably  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline
**Sample** & **SiO\({}_{2}\)** & **Al\({}_{2}\)O\({}_{3}\)** & **TFe\({}_{2}\)O\({}_{3}\)** & **TiO\({}_{2}\)** & **CaO** & **MgO** & **K\({}_{2}\)O** & **MnO** & **P\({}_{2}\)O\({}_{5}\)** & **Na\({}_{2}\)O** & **CIA** & **Al\({}_{2}\)O\({}_{3}\)/TiO\({}_{2}\)** \\ \hline Y1 & 88.20 & 5.79 & 3.30 & 0.63 & 0.18 & 0.16 & 1.01 & 0.01 & 0.03 & 0.02 & 84.65 & 9.18 \\ Y2 & 63.00 & 18.10 & 5.03 & 1.46 & 0.50 & 0.60 & 2.57 & 0.01 & 0.06 & 0.12 & 86.56 & 12.40 \\ Y3 & 61.00 & 17.90 & 7.56 & 1.39 & 0.41 & 0.56 & 2.41 & - & 0.05 & 0.06 & 87.62 & 12.88 \\ Y4 & 39.60 & 27.50 & 9.68 & 1.63 & 0.21 & 0.68 & 3.15 & 0.06 & 0.13 & 0.08 & 89.26 & 16.87 \\ Y5 & 39.60 & 34.20 & 0.50 & 0.94 & 0.21 & 0.11 & 0.53 & - & 0.06 & - & 98.47 & 36.23 \\ Y6 & 32.10 & 30.10 & 0.25 & 0.37 & 0.34 & 0.12 & 0.67 & - & 0.16 & 0.04 & 97.57 & 81.57 \\ Y7 & 38.60 & 35.40 & 4.58 & 1.02 & 0.73 & 0.23 & 0.20 & 0.01 & 0.13 & 0.01 & 99.38 & 34.71 \\ Y8 & 20.00 & 60.80 & 2.21 & 2.60 & 0.11 & 0.45 & 0.32 & 0.01 & 0.17 & 0.13 & 99.09 & 23.38 \\ Y9 & 44.20 & 36.00 & 2.20 & 1.65 & 0.21 & 0.70 & 2.57 & - & 0.23 & 0.07 & 93.00 & 21.82 \\ Y10 & 43.80 & 30.90 & 9.06 & 1.45 & 0.22 & 0.47 & 1.07 & 0.02 & 0.10 & 0.05 & 96.35 & 21.31 \\ Y11 & 43.30 & 32.70 & 5.99 & 1.59 & 0.26 & 0.95 & 3.68 & - & 0.09 & 0.08 & 89.49 & 20.57 \\ Max. & 88.20 & 60.80 & 9.68 & 2.60 & 0.73 & 0.95 & 3.68 & 0.06 & 0.23 & 0.13 & - & - \\ Min. & 20.00 & 5.79 & 0.25 & 0.37 & 0.11 & 0.11 & 0.20 & 0.01 & 0.03 & 0.02 & - & - \\ Av. & 46.67 & 29.94 & 4.58 & 1.34 & 0.31 & 0.46 & 1.65 & 0.02 & 0.11 & 0.06 & - & - \\ CC & 0.71 & 1.97 & 1.02 & 2.68 & 0.07 & 0.21 & 0.49 & 0.22 & 0.55 & 0.02 & - & - \\ S1 & 75.40 & 10.90 & 5.55 & 1.16 & 0.39 & 0.32 & 1.17 & 0.01 & 0.07 & 0.09 & 89.04 & 9.40 \\ S2 & 1.90 & 1.00 & 0.48 & 0.04 & 6.26 & 0.28 & 0.04 & - & 0.01 & 0.02 & 92.76 & 25.00 \\ S3 & 79.60 & 11.50 & 1.81 & 1.20 & 0.24 & 0.30 & 1.12 & 0.01 & 0.04 & 0.04 & 90.58 & 9.58 \\ S4 & 58.40 & 21.60 & 4.97 & 1.78 & 0.47 & 0.64 & 2.21 & 0.01 & 0.07 & 0.06 & 90.28 & 12.13 \\ S5 & 43.30 & 31.70 & 4.13 & 2.06 & 0.65 & 0.80 & 2.92 & 0.01 & 0.11 & 0.10 & 91.02 & 15.39 \\ S6 & 3.78 & 1.52 & 1.38 & 0.13 & 6.02 & 0.36 & 0.04 & - & 0.02 & 0.06 & 90.8 & 11.69 \\ S7 & 38.20 & 45.00 & 0.86 & 1.00 & 0.09 & 0.17 & 0.08 & - & 0.03 & - & 99.81 & 45.00 \\ S8 & 21.30 & 61.10 & 1.89 & 1.25 & 0.10 & 0.15 & 0.12 & 0.03 & 0.06 & - & 99.8 & 48.88 \\ S9 & 31.70 & 50.00 & 1.72 & 2.32 & 0.14 & 0.63 & 0.77 & - & 0.13 & 0.07 & 98.22 & 21.55 \\ Max. & 79.60 & 61.10 & 5.55 & 2.32 & 6.26 & 0.80 & 2.92 & 0.03 & 0.13 & 0.10 & - & - \\ Min. & 1.90 & 1.00 & 0.48 & 0.04 & 0.09 & 0.15 & 0.04 & 0.01 & 0.01 & 0.02 & - & - \\ Av. & 39.29 & 26.04 & 2.53 & 1.22 & 1.6 & 0.41 & 0.94 & 0.01 & 0.06 & 0.05 & - & - \\ CC & 0.60 & 1.72 & 0.56 & 2.43 lower than those of the bauxite and exhibited a decreasing trend. This signifies that the overall weathering degree of the profile is relatively low, and suggests that the bauxite metallogenic materials may have undergone significant weathering prior to the deposition of the overlying layers, presumably occurring prior to or during the deposition stage of the metallogenic materials in the basin.