Table T39. Whole-rock major and trace element compositions of visibly altered rocks and rocks containing >2 wt% loss on ignition, Expedition 312.
| Core, section, piece, interval (cm): |
312-1256D- | ||
|---|---|---|---|
| 184R-1 (Piece 19, 98–104) | 187R-1 (Piece 22, 93–98) | 192R-1 (Piece 2, 11–13) | |
| Unit: | 1256D-74 | 1256D-76 | 1256D-78 |
| Depth (mbsf): | 1315.48 | 1325.23 | 1348.41 |
| Subdivision: | Basaltic dike | Basaltic dike | Basaltic dike, altered |
| Thin section: | 24 | 28 | 32 |
| Major element oxide (wt%): | |||
| SiO2 | 49.56 | 51.78 | 52.34 |
| TiO2 | 1.60 | 1.51 | 1.39 |
| Al2O3 | 13.98 | 13.60 | 13.59 |
| FeO | 13.33 | 12.27 | 11.65 |
| MnO | 0.16 | 0.19 | 0.16 |
| MgO | 7.55 | 6.97 | 7.04 |
| CaO | 10.42 | 9.77 | 10.88 |
| Na2O | 3.10 | 3.27 | 2.78 |
| K2O | 0.16 | 0.58 | 0.06 |
| P2O5 | 0.16 | 0.07 | 0.10 |
| LOI | 3.18 | 1.11 | 0.13 |
| Trace element (ppm): | |||
| Ba | 30.6 | 46.5 | 6.47 |
| Sr | 91.5 | 95.9 | 78.8 |
| Zr | 82.6 | 74.6 | 70.8 |
| Y | 27.3 | 27.5 | 27.0 |
| Sc | 42.4 | 42.0 | 40.9 |
| V | 342 | 331 | 322 |
| Cr | 88.2 | 76.8 | 87.3 |
| Co | 45.3 | 45.9 | 47.6 |
| Ni | 53.7 | 48.6 | 53.9 |
| Cu | BDL | 34.2 | BDL |
| Zn | 60.0 | 59.0 | 61.1 |
| Mg# | 50.2 | 50.3 | 51.9 |
| Total alkalis | 3.25 | 3.84 | 2.84 |
| Ca/Al | 1.01 | 0.97 | 1.08 |
| K/Ti | 0.14 | 0.53 | 0.06 |
| Ti/Zr | 116 | 121 | 118 |
| Zr/Y | 3.03 | 2.71 | 2.62 |
| Sr/Y | 3.36 | 3.49 | 2.92 |
| Sr/Ba | 2.99 | 2.06 | 12.2 |
| K/Ba | 42.9 | 103 | 72.6 |
Notes: Mg# = MgO/(40.311)/[(MgO/40.311) + (FeO/71.846)]. Total alkalis = K2O + Na2O. BDL = below detection limit. LOI = loss on ignition.
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