Table 7
Whole-rock major (wt%) and trace elements (ppm) compositions of Group II dykes. LOI = Loss On Ignition, N = primitive mantle, n = chondrite.
| Samples | TD3a | TD4a | TD2a | TD2 | TD3 | TD4 |
|---|---|---|---|---|---|---|
| Lat. N | 14.288 | 14.273 | 14.271 | 14.271 | 14.288 | 14.273 |
| Long. E | 1.411 | 1.408 | 1.406 | 1.406 | 1.411 | 1.408 |
| Major elements (wt%) | ||||||
| SiO2 | 55.9 | 54.7 | 56.6 | 56.6 | 54.8 | 56.5 |
| Al2O3 | 12.85 | 13.05 | 13.2 | 13.1 | 12.75 | 12.35 |
| Fe2O3 | 13.7 | 15.35 | 14.05 | 13.85 | 13.8 | 13.60 |
| CaO | 6.49 | 6.03 | 6.34 | 6.5 | 6.81 | 6.23 |
| MgO | 3.03 | 3.47 | 3.13 | 2.95 | 3.2 | 2.90 |
| Na2O | 2.57 | 3.59 | 2.84 | 2.81 | 2.69 | 2.81 |
| K2O | 1.68 | 0.93 | 1.52 | 1.62 | 1.62 | 1.58 |
| Cr2O3 | 0.009 | 0.007 | 0.009 | 0.005 | 0.008 | 0.004 |
| TiO2 | 1.36 | 1.42 | 1.39 | 1.34 | 1.34 | 1.38 |
| MnO | 0.17 | 0.19 | 0.18 | 0.18 | 0.18 | 0.17 |
| P2O5 | 0.21 | 0.21 | 0.23 | 0.22 | 0.2 | 0.23 |
| SrO | 0.03 | 0.02 | 0.03 | 0.03 | 0.03 | 0.03 |
| BaO | 0.06 | 0.05 | 0.07 | 0.05 | 0.04 | 0.05 |
| LOI | 1.99 | 2.22 | 2.34 | 1.75 | 1.88 | 1.78 |
| Total | 100.05 | 101.24 | 101.93 | 101.01 | 99.35 | 99.61 |
| Mg# | 33.20 | 33.69 | 33.37 | 32.38 | 34.26 | 32.40 |
| DI | 36.15 | 22.81 | 48.96 | 49.28 | 46.53 | 50.00 |
| Trace elements (ppm) | ||||||
| Ba | 569 | 423 | 616 | 439 | 411 | 442 |
| Ce | 49.1 | 41.4 | 46.1 | 45.2 | 43.4 | 48.2 |
| Cr | 66 | 51 | 63 | 41 | 60 | 34 |
| Cs | 0.95 | 0.4 | 0.86 | 1.2 | 1.42 | 1.25 |
| Dy | 5.44 | 5.08 | 5.09 | 5.1 | 5.01 | 5.10 |
| Er | 2.96 | 2.84 | 2.91 | 2.8 | 2.89 | 2.79 |
| Eu | 1.54 | 1.52 | 1.66 | 1.49 | 1.49 | 1.49 |
| Ga | 23.1 | 22.1 | 23.4 | 23.1 | 22.9 | 21.0 |
| Gd | 6.21 | 5.48 | 5.73 | 5.49 | 5.31 | 5.62 |
| Hf | 4.67 | 4.1 | 4.48 | 4.35 | 4.11 | 4.35 |
| Ho | 1.18 | 1.06 | 1.08 | 1.09 | 1.08 | 1.11 |
| La | 21.9 | 20 | 22.2 | 21.3 | 20.3 | 21.7 |
| Lu | 0.35 | 0.33 | 0.41 | 0.36 | 0.38 | 0.36 |
| Nb | 7.58 | 6.37 | 7.19 | 7.06 | 6.7 | 6.75 |
| Nd | 27.3 | 22.9 | 24.7 | 24.7 | 23.3 | 25.2 |
| Pr | 6.38 | 5.35 | 5.89 | 5.61 | 5.3 | 5.95 |
| Rb | 52.9 | 22.2 | 41.7 | 48 | 49.6 | 52.5 |
| Sm | 5.91 | 5.77 | 6.31 | 5.48 | 5.63 | 5.67 |
| Sn | 10.4 | 1.7 | 7.4 | 2.5 | 13 | 1.3 |
| Sr | 309 | 208 | 269 | 246 | 282 | 265 |
| Ta | 0.5 | 0.4 | 0.5 | 0.5 | 0.5 | 0.4 |
| Tb | 0.97 | 0.86 | 0.88 | 0.84 | 0.87 | 0.88 |
| Th | 3.78 | 3.25 | 3.77 | 3.76 | 3.48 | 3.65 |
| Tm | 0.44 | 0.39 | 0.41 | 0.44 | 0.41 | 0.39 |
| U | 3.34 | 2.08 | 1.96 | 2.11 | 1.5 | 1.25 |
| V | 341 | 394 | 352 | 339 | 362 | 312 |
| W | 0.9 | 0.7 | 1 | 1 | 0.9 | 0.9 |
| Y | 28.9 | 28.5 | 28.7 | 27.3 | 26.4 | 28.8 |
| Yb | 2.87 | 2.4 | 2.41 | 2.58 | 2.47 | 2.52 |
| Zr | 175 | 152 | 167 | 163 | 158 | 165 |
| ThN/ NbN | 4.18 | 4.28 | 4.39 | 4.46 | 4.35 | 4.53 |
| ThN/ LaN | 1.39 | 1.31 | 1.37 | 1.42 | 1.38 | 1.35 |
| Lan/ Ybn | 5.14 | 5.62 | 6.21 | 5.57 | 5.54 | 5.81 |
| Cen/ Ybn | 2.33 | 4.46 | 2.21 | 2.44 | 2.27 | 2.41 |
| TaN/LaN | 0.38 | 0.34 | 0.38 | 0.39 | 0.41 | 0.31 |
| HfN/SmN | 1.14 | 1.02 | 1.02 | 1.14 | 1.05 | 1.1 |
| Eu/Eu* | 0.78 | 0.83 | 0.84 | 0.83 | 0.83 | 0.81 |
DI: Q+Fk+Ab+Ne+Leu is calculated from CIPW normative percentage, after Thornton et al. (1960) (Q = quartz, Fk = orthoclase, Ab = albite, Ne = nepheline, Leu = leucite), Eu/Eu* = Eun/((Gdn + Smn) /2): standard formula for calculated Eu anomalies.
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