Open Access
Table 2
Major and trace element compositions and CIA values of representative Erguita sediments.
| Samples | OB3 | 250 | 157 | 118 | 109 | 103 | 64 | 55 | 31 | 28 |
|---|---|---|---|---|---|---|---|---|---|---|
| Lithologies | Clayey calcarenite | Carbonates | P-rich, carbonated sandstone | P-rich, carbonated sandstone | P-poor, carbonated sandstone | Carbonates | P-rich, carbonated sandstone | P-poor, carbonated sandstone | P-rich calcarenite | P-poor, carbonated sandstone |
| Height (m) | 282.5 | 247.1 | 144.5 | 98.4 | 86.5 | 81.4. | 36.9 | 32 | 15.4 | 13.3 |
| SiO2 (%) | 27.64 | 5 | 47.39 | 53.26 | 57.01 | 14.14 | 51.15 | 61.13 | 15.76 | 59.13. |
| Al2O3 (%) | 5.2 | 0.62 | 1.91 | 1.69 | 1.49 | 2.28 | 1.32 | 2.66 | 0.64 | 3.8 |
| Fe2O3 (%) | 2.04 | 0.31 | 0.52 | 0.6 | 0.29 | 0.97 | 0.32 | 0.88 | 0.25 | 1.3 |
| MnO (%) | b.d. | b.d. | b.d. | 0.019 | 0.018 | 0.02 | b.d. | 0.023 | b.d. | 0.032 |
| MgO (%) | 12.03 | 17.73 | 7.61 | 8.2 | 4.78 | 15.94 | 1.46 | 6.16 | 9.55 | 7 |
| CaO (%) | 19.28 | 30.6 | 17.12 | 13.55 | 15.7 | 24.54 | 21.95 | 10.09 | 33.01 | 9.61 |
| Na2O (%) | 0.13 | 0.06 | 0.15 | 0.06 | 0.11 | 0.07 | 0.4 | 0.06 | 0.48 | 0.1 |
| K2O (%) | 1 | b.d. | 0.68 | 0.66 | 0.71 | 0.52 | 0.79 | 1.07 | 0.33 | 1.51 |
| TiO2 (%) | 0.3 | 0.034 | 0.19 | 0.18 | 0.12 | 0.12 | 0.077 | 0.28 | 0.033 | 0.37 |
| P2O5 (%) | 1.02 | 0.65 | 3.32 | 0.89 | 3.31 | 0.35 | 10.8 | b.d. | 11.06 | 0.17 |
| LOI (%) | 30.35 | 43.69 | 19.97 | 19.74 | 15.01 | 39.95 | 9.8 | 16.15 | 26.24 | 16.56 |
| Total | 99 | 98.7 | 98.9 | 98.8 | 98.5 | 98.9 | 98.1 | 98.5 | 97.4 | 99.6 |
| CIA | 77.5 | 74.1# | 60.6 | 65.3 | 57.2 | 74.3 | − | 66.4 | − | 66 |
| La (ppm) | 13.15 | 2 | 10.23 | 7.13 | 10.76 | 4.41 | 20.85 | 7.9 | 6.83 | 11.97 |
| Ce (ppm) | 23.22 | 3.3 | 15.74 | 13.3 | 16.68 | 8.17 | 26.8 | 16.18 | 9.62 | 24.79 |
| Pr (ppm) | 2.98 | 0.43 | 2.28 | 1.72 | 2.43 | 1.05 | 4.38 | 1.96 | 1.43 | 3.02 |
| Nd (ppm) | 11.38 | 1.67 | 9.24 | 6.75 | 10.08 | 4.14. | 18.27 | 7.43 | 5.83 | 11.64 |
| Sm (ppm) | 2.27 | 0.35 | 1.94 | 1.44 | 2.17 | 0.83 | 4.03 | 1.58 | 1.27 | 2.41 |
| Eu (ppm) | 0.49 | 0.08 | 0.45 | 0.34 | 0.53 | 0.19 | 1.01 | 0.33 | 0.33 | 0.5 |
| Gd (ppm) | 1.97 | 0.33 | 1.87 | 1.38 | 2.13 | 0.69 | 4.16 | 1.45 | 1.29 | 2.23 |
| Tb (ppm) | 0.3 | 0.05 | 0.29 | 0.23 | 0.32 | 0.11 | 0.62 | 0.25 | 0.19 | 0.37 |
| Dy (ppm) | 1.92 | 0.32 | 1.91 | 1.48 | 2.05 | 0.69 | 3.96 | 1.62 | 1.21 | 2.48 |
| Ho (ppm) | 0.41 | 0.07 | 0.43 | 0.33 | 0.46 | 0.14 | 0.9 | 0.36 | 0.28 | 0.54 |
| Er (ppm) | 1.15 | 0.19 | 1.25 | 0.95 | 1.28 | 0.42 | 2.59 | 1.03 | 0.81 | 1.57 |
| Tm (ppm) | 0.17 | 0.03 | 0.19 | 0.15 | 0.19 | 0.07 | 0.37 | 0.17 | 0.12 | 0.25 |
| Yb (ppm) | 1.1 | 0.19 | 1.32 | 1 | 1.22 | 0.47 | 2.28 | 1.19 | 0.78 | 1.69 |
| Lu (ppm) | 0.17 | 0.03 | 0.21 | 0.16 | 0.2 | 0.08 | 0.37 | 0.19 | 0.13 | 0.27 |
| Y (ppm) | 12.79 | 2.4 | 16.1 | 10.21 | 17.72 | 4.32 | 41.38 | 9.2 | 11.26 | 14.19 |
| Zr (ppm) | 69.12 | 18.45 | 248.9 | 208.97 | 186.96 | 24.69 | 46.76 | 348.39 | 22.83 | 371.13 |
| (La/Yb)SN | 0.88 | 0.79 | 0.58 | 0.53 | 0.66 | 0.7 | 0.68 | 0.49 | 0.65 | 0.53 |
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