Table T42. Distribution and relative abundances of veins with different secondary mineral fillings in the sheeted dike complex and the plutonic section, Hole 1256D.
| Zone | Total | Vein types | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Saponite | Carbonate | Sulfide | Quartz | Zeolite | Chlorite-smectite | Chlorite | Actinolite | Prehnite | Epidote | Anhydrite | Hornblende | Magnetite | Plagioclase | ||
| Sheeted dikes: | |||||||||||||||
| Expedition 309: | |||||||||||||||
| Veins per meter | 28 | 0.6 | 0.4 | 14 | 2 | 0.03 | 2.2 | 22 | — | — | 0.3 | 4.9 | — | — | — |
| Veins per meter (normalized) | 28 | 0.6 | 0.3 | 14 | 2 | 0.08 | 3.2 | 22 | — | — | 0.5 | 5.3 | — | — | — |
| Expedition 312: | |||||||||||||||
| Veins per meter | 32 | — | 0.7 | 12 | 15 | 1.4 | — | 27 | 5.8 | 0.3 | — | 0.3 | 0.3 | 0.2 | — |
| Veins per meter (normalized) | 37 | — | 0.3 | 11 | 14 | 1.7 | — | 28 | 11 | 0.2 | — | 0.2 | 0.3 | 0.2 | — |
| Lithologic zone: | |||||||||||||||
| Upper sheeted dikes: | |||||||||||||||
| Veins per meter | 29 | 0.5 | 0.4 | 14 | 4 | 0.2 | 1.9 | 23 | 0.1 | 0.05 | 0.2 | 4.3 | — | — | — |
| Veins per meter (normalized) | 31 | 0.4 | 0.4 | 13 | 8 | 0.6 | 2.1 | 26 | 0.8 | 0.08 | 0.4 | 3.6 | — | — | — |
| Granular sheeted dikes: | |||||||||||||||
| Veins per meter | 36 | — | 0.2 | 9 | 8 | 1.0 | — | 16 | 23 | — | — | 0.2 | 1.5 | 1.0 | — |
| Veins per meter (normalized) | 36 | — | 0.2 | 10 | 6 | 1.8 | — | 18 | 23 | — | — | 0.2 | 0.9 | 0.6 | — |
| Gabbro 1: | |||||||||||||||
| Veins per meter | 6 | — | 0.1 | 0.2 | 1 | 0.2 | — | 3 | 3 | 0.07 | 0.6 | — | 0.7 | — | 0.2 |
| Veins per meter (normalized) | 9 | — | 0.1 | 0.1 | 4 | 0.2 | — | 5 | 2 | 0.03 | 0.8 | — | 1.1 | — | 0.3 |
| Upper dike screen: | |||||||||||||||
| Veins per meter | 14 | — | — | — | 1 | — | — | 3 | 9 | — | 0.3 | — | 2.1 | 0.3 | 1.0 |
| Veins per meter (normalized) | 9 | — | — | — | 3 | — | — | 4 | 4 | — | 0.1 | — | 5.0 | 1.7 | 4.8 |
| Gabbro 2: | |||||||||||||||
| Veins per meter | 8 | — | — | 0.1 | 0.5 | — | — | 5 | 3 | — | — | — | — | — | 0.2 |
| Veins per meter (normalized) | 9 | — | — | 0.1 | 0.7 | — | — | 5 | 4 | — | — | — | — | — | 0.3 |
| Lower dike screen: | |||||||||||||||
| Veins per meter | 29 | — | — | — | 13 | — | — | 29 | — | — | — | — | — | — | — |
| Veins per meter (normalized) | 31 | — | — | — | 14 | — | — | 31 | — | — | — | — | — | — | — |
Notes: Vein abundances are calculated both as the average veins per meter of recovered core and the average veins per meter cored, where the vein abundance is normalized to core recovery. Significant differences between these two averages result from the typically higher recovery in the less fractured/veined intervals, biasing the average veins per meter of recovered core toward lower vein abundances. However, normalizing the number of veins in cores with very low recovery through each entire cored interval introduces significant error. An intermediate value is probably most appropriate. — = not applicable.
Previous | Close | Next | Top of page