Table 1. Bulk rock compositions of the outer margin and the core of a basanite flow in comparison with fresh material from the same grab (21891–4).
| Margin | Core | Fresh* | |
|---|---|---|---|
| SiO2 (wt.%) | 35.5 | 39.2 | 42.5 |
| TiO2 (wt.%) | 3.6 | 2.7 | 2.6 |
| Al2O3 (wt.%) | 13.7 | 13.5 | 12.9 |
| Fe2O3 (wt.%) | 14.2 | 11.6 | 12.1 |
| MnO (wt.%) | 0.35 | 0.16 | 0.18 |
| MgO (wt.%) | 11.3 | 11.9 | 14.2 |
| CaO (wt.%) | 12.6 | 12.2 | 12.2 |
| Na2O (wt.%) | 1.61 | 2.16 | 2.09 |
| K2O (wt.%) | 0.96 | 1.21 | 0.95 |
| P2O5 (wt.%) | 0.52 | 0.40 | 0.39 |
| Total (wt.%) | 94.3 | 95.0 | 100.1 |
| TOC (wt.%) | 0.20 | 0.09 | n.d. |
| TIC (wt.%) | 0.13 | 0.09 | n.d. |
| TN (wt.%) | 0.06 | 0.03 | n.d. |
| S-T (wt.%) | 0.33 | 0.26 | n.d. |
| S-TRIS (wt.%) | 0.01 | 0.02 | n.d. |
| Cl* (wt.%) | 0.29 | 0.15 | n.d. |
| Fe-T (wt.%) | 9.9 | 8.1 | n.d. |
| Fe* (wt.%) | 2.57 | 0.77 | n.d. |
| Mn-T (wt.%) | 0.27 | 0.16 | n.d. |
| Mn* (wt.%) | 0.13 | 0.03 | n.d. |
| As (mg/kg) | 57 | 14 | n.d. |
| Ba(mg/kg) | 295 | 370 | 353 |
| Co (mg/kg) | 72 | 50 | 58 |
| Cr (mg/kg) | 624 | 843 | 747 |
| Cu (mg/kg) | 236 | 240 | 81 |
| Hg (μg/kg) | 8 | 6 | n.d. |
| Ni (mg/kg) | 207 | 219 | 285 |
| Pb (mg/kg) | 7 | 2 | 2 |
| Rb (mg/kg) | 14 | 21 | 22 |
| Sr (mg/kg) | 465 | 512 | 507 |
| V (mg/kg) | 459 | 368 | n.d. |
| Y (mg/kg) | 41 | 27 | 23 |
| Zn (mg/kg) | 110 | 86 | n.d. |
| Zr (mg/kg) | 239 | 187 | 180 |
*Data from [17]
n.d. = not determined.