Table T4. Total mode and chemical composition of the Leg 176 core from 500 to 1508 mbsf.
| Plagioclase | Augite | Olivine | Orthopyroxene | Oxide | |
|---|---|---|---|---|---|
| Macroscopic* mode: | 59.5 | 30.1 | 8.8 | 0.3 | 0.76 |
| Microscopic mode**: | 58.9 | 30.6 | 8.2 | 0.6 | 0.79 |
| Bulk composition*** | |||||
| Leg 118 | Leg 176 | Hole 735B | |||
| Depth (mbsf): | 0-500 | 500-1508 | 0-1508 | ||
| SiO2 (wt%): | 49.4 | 50.8 | 50.3 | ||
| TiO2 (wt%): | 1.4 | 0.7 | 0.9 | ||
| Al2O3 (wt%): | 15.7 | 16.0 | 15.9 | ||
| Fe2O3, total (wt%): | 9.6 | 8.1 | 8.6 | ||
| MnO (wt%): | 0.6 | 0.1 | 0.1 | ||
| MgO (wt%): | 9.1 | 9.1 | 9.1 | ||
| CaO (wt%): | 12.1 | 12.3 | 12.2 | ||
| Na2O (wt%): | 2.7 | 2.9 | 2.8 | ||
| K2O (wt%): | 0.1 | 0.0 | 0.1 | ||
| P2O5 (wt%): | 0.0 | 0.1 | 0.1 | ||
| Total (wt%): | 100.3 | 100.0 | 100.1 | ||
| Mg# (Fe2+ 90% of Fe) | 67.6 | 71.6 | 69.9 | ||
Note: Also given is the Leg 118 data (Dick et al., 1991) and the weighted average for the entire Hole 735B. * = Average weighted mode from macroscopic estimations of 458 intervals (volume percent). ** = Average weighted mode from averages of rock types derived by point counting in 220 thin sections (volume percent). *** = Average weighted chemical composition from averages of rock types characterized in thin sections and normalized to 100%.