Table T38. Principal components calculated from shipboard data acquired during Leg 206 and Expeditions 309 and 312.
| Component | Standard deviation |
Variance (%) |
TiO2 | Al2O3 | FeO | MnO | MgO | CaO | Na2O | P2O5 | Ni | Sc | Cr | V | Zr | Y | Sr |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2.91 | 56.3 | 0.32 | –0.18 | 0.33 | 0.14 | –0.30 | –0.29 | 0.21 | 0.23 | –0.27 | 0.19 | –0.28 | 0.33 | 0.30 | 0.29 | 0.00 |
| 2 | 1.37 | 12.6 | –0.17 | –0.34 | 0.07 | 0.24 | 0.02 | 0.12 | –0.12 | –0.31 | –0.31 | 0.22 | –0.29 | –0.03 | –0.27 | –0.14 | –0.59 |
| 3 | 1.08 | 7.8 | –0.08 | 0.45 | –0.06 | 0.67 | 0.11 | –0.05 | 0.48 | –0.22 | –0.06 | –0.13 | 0.01 | –0.05 | –0.04 | 0.15 | 0.00 |
| 4 | 0.88 | 5.2 | 0.16 | –0.28 | –0.02 | 0.35 | 0.05 | 0.29 | –0.17 | 0.30 | 0.17 | –0.44 | 0.33 | 0.05 | 0.26 | 0.16 | –0.39 |
| 5 | 0.82 | 4.5 | 0.01 | –0.01 | –0.06 | 0.17 | 0.30 | 0.19 | –0.12 | –0.04 | 0.30 | 0.75 | 0.21 | 0.17 | 0.13 | 0.27 | 0.05 |
| 6 | 0.79 | 4.2 | 0.10 | 0.10 | –0.10 | –0.21 | –0.11 | –0.04 | 0.55 | 0.32 | 0.16 | 0.27 | 0.18 | –0.16 | 0.04 | –0.36 | –0.47 |
| 7 | 0.63 | 2.7 | 0.02 | –0.69 | –0.03 | 0.02 | 0.18 | 0.14 | 0.52 | –0.18 | 0.10 | –0.07 | 0.01 | –0.07 | –0.01 | –0.08 | 0.36 |
| 8 | 0.57 | 2.2 | 0.13 | 0.13 | 0.01 | –0.36 | –0.30 | 0.34 | 0.18 | –0.60 | –0.09 | –0.08 | 0.25 | 0.22 | 0.19 | 0.24 | –0.17 |
| 9 | 0.46 | 1.4 | –0.02 | 0.12 | –0.07 | 0.05 | –0.13 | 0.69 | 0.05 | 0.36 | –0.50 | 0.14 | –0.05 | –0.13 | –0.02 | –0.05 | 0.25 |
| 10 | 0.42 | 1.2 | –0.03 | 0.07 | 0.03 | –0.37 | 0.72 | –0.04 | 0.18 | 0.15 | –0.31 | –0.14 | –0.08 | 0.10 | –0.02 | 0.33 | –0.20 |
| 11 | 0.33 | 0.7 | 0.38 | 0.08 | 0.66 | 0.08 | 0.22 | –0.02 | –0.08 | –0.12 | –0.18 | 0.04 | 0.41 | –0.12 | –0.15 | –0.30 | 0.09 |
| 12 | 0.27 | 0.5 | 0.29 | 0.20 | 0.23 | –0.03 | 0.14 | 0.38 | 0.04 | –0.02 | 0.46 | –0.11 | –0.60 | 0.20 | –0.03 | –0.19 | –0.03 |
| 13 | 0.25 | 0.4 | –0.39 | –0.03 | 0.49 | –0.09 | –0.24 | 0.11 | 0.14 | 0.19 | 0.27 | –0.02 | 0.07 | –0.11 | –0.45 | 0.43 | –0.04 |
| 14 | 0.22 | 0.3 | 0.02 | 0.01 | 0.17 | –0.06 | 0.03 | 0.01 | –0.06 | –0.14 | 0.06 | 0.07 | –0.22 | –0.79 | 0.47 | 0.21 | –0.06 |
| 15 | 0.15 | 0.1 | –0.65 | 0.04 | 0.33 | 0.01 | 0.08 | 0.04 | 0.04 | 0.01 | –0.02 | –0.03 | 0.04 | 0.26 | 0.52 | –0.33 | 0.02 |
Notes: Each row corresponds to an individual principal component, and there are as many principal components as elements included in the analysis. The first column is the standard deviation associated with a given component, and the second column shows the percentage of the total variance in the data set that is accounted for by the principal component in that row. Components are ordered by importance, so that the first component, shown in the first row, accounts for 56.3% of the variance in the data set, and the second component accounts for 12.6% of the variance. It is likely that these are the only two principal components that contain useful petrogenetic information. It is common practice to consider only components with a standard deviation >1 as significant, and the structure of the third component indicates that it is caused either by analytical noise or an unknown seafloor alteration process. Numbers in the columns beneath the elements correspond to the weighting of each element in the principal component of interest. The greater the absolute magnitude of the number, the more closely correlated the element is with the principal component.
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