Type of rock Name Sample | High Mg Nb-enriched basalts (LMg-NB) | Low Mg Nb-enriched basalts (LMg-NB) |
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Basanite |
| Basalt | Basalt |
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| Hawaiite |
| Mugearite |
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BAF 22 |
| BAF 42 | BAF 18 | BAF36 |
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| BAF 2 |
| BAF3 |
| BAF37 |
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Position | µ | µ | µ | µ | µϕ | µ | µ | µϕ | µϕ | ϕ | µ | ϕ | µ |
n˚ | 23/1 | 29/1 | 83/1 | 123/1 | 51/1 | 42/1 | 48/1 | 103/ 1 | 105/1 | 114/1 | 111/1 | 71/1 | 61/1 |
SiO2 | 0.10 | 0.03 | 0.25 | 0.05 | 0.06 | 0.05 | 0.12 | 0.06 | 0.04 | 0.12 | 0.09 | 0.06 | 0.10 |
Al2O3 | 2.57 | 2.55 | 4.75 | 2.07 | 3.30 | 1.32 | 3.26 | 1.81 | 1.72 | 2.56 | 1.61 | 1.50 | 1.51 |
TiO2 | 25.14 | 24.86 | 22.90 | 21.89 | 22.79 | 25.99 | 22.20 | 26.17 | 26.15 | 21.79 | 23.05 | 20.38 | 19.93 |
FeO | 65.30 | 65.30 | 62.85 | 68.56 | 66.16 | 67.28 | 66.62 | 67.06 | 67.96 | 69.56 | 69.91 | 73.37 | 72.90 |
MnO | 0.72 | 0.76 | 0.58 | 0.60 | 0.59 | 0.71 | 0.56 | 0.71 | 0.80 | 0.70 | 0.71 | 0.72 | 0.79 |
MgO | 3.69 | 3.07 | 5.07 | 3.23 | 3.79 | 1.98 | 4.09 | 2.20 | 2.22 | 2.70 | 2.37 | 1.50 | 1.11 |
CaO | 0.19 | 0.14 | 0.22 | 0.13 | 0.02 | 0.16 | 0.05 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.05 |
Cr2O3 | 0.27 | 0.25 | 0.37 | 0.40 | 0.58 | 0.14 | 0.46 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
NiO | 0.03 | 0.09 | 0.04 | 0.00 | 0.02 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
Na2O | 0.02 | 0.02 | 0.00 | 0.00 | 0.07 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.06 | 0.05 | 0.00 |
K2O | 0.02 | 0.01 | 0.00 | 0.01 | 0.01 | 0.03 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
P2O5 | 0.00 | 0.00 | 0.00 | 0.03 | 0.02 | 0.02 | 0.05 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
TOTAL | 97.76 | 96.84 | 96.66 | 96.57 | 96.84 | 97.57 | 96.95 | 98.04 | 98.88 | 97.44 | 97.81 | 97.60 | 96.41 |
Formula based on 24 cations and 32 oxygen atoms | |||||||||||||
Si | 0.0288 | 0.0098 | 0.0702 | 0.0138 | 0.0173 | 0.0161 | 0.0334 | 0.0189 | 0.0115 | 0.0357 | 0.0266 | 0.0162 | 0.0296 |
Al | 0.8739 | 0.8790 | 1.5938 | 0.7150 | 1.1213 | 0.4604 | 1.1056 | 0.6259 | 0.5905 | 0.8803 | 0.5561 | 0.5207 | 0.5331 |
Ti | 5.4512 | 5.4690 | 4.9067 | 4.8125 | 4.9431 | 5.7678 | 4.8071 | 5.7701 | 5.7176 | 4.7773 | 5.0695 | 4.5140 | 4.4845 |
Fe3+ | 4.1182 | 4.1202 | 4.3707 | 5.5436 | 4.8691 | 3.9591 | 5.1086 | 3.8008 | 3.9513 | 5.4937 | 5.2875 | 6.4496 | 6.4400 |
Cr | 0.0626 | 0.0576 | 0.0829 | 0.0930 | 0.1333 | 0.0328 | 0.1048 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
Fe2+ | 11.6264 | 11.8562 | 10.6052 | 11.2217 | 11.0879 | 12.6452 | 10.9335 | 12.6415 | 12.5721 | 11.4657 | 11.8135 | 11.6236 | 11.7992 |
Mg | 1.5842 | 1.3397 | 2.1540 | 1.4060 | 1.6283 | 0.8715 | 1.7539 | 0.9612 | 0.9601 | 1.1737 | 1.0334 | 0.6605 | 0.4954 |
Mn | 0.1751 | 0.1892 | 0.1398 | 0.1481 | 0.1443 | 0.1776 | 0.1369 | 0.1769 | 0.1968 | 0.1737 | 0.1766 | 0.1808 | 0.2013 |
Ni | 0.0065 | 0.0220 | 0.0084 | 0.0000 | 0.0035 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
TOTAL | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
USP | 90 | 88 | 88 | 83 | 85 | 89 | 85 | 89 | 89 | 81 | 83 | 75 | 75 |
Sp | 4 | 4 | 7 | 3 | 5 | 2 | 5 | 2 | 2 | 4 | 2 | 2 | 2 |
Mt | 6 | 8 | 5 | 13 | 11 | 9 | 10 | 8 | 9 | 15 | 14 | 22 | 23 |