Table T20. Veins and breccias.
| Cores | Core recovered (m) | Total | Saponite | Celadonite | CaCO3 | Sulfide | Iron oxyhydroxide |
SiO2 | Zeolite | Chlorite- smectite |
Chlorite | Epidote | Anhydrite |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Leg 206, Cores 309-1256D-2R through 74R (250–752 mbsf): | |||||||||||||
| Number of veins | 224.2 | 5036 | 4865 | 367 | 90 | 813 | 629 | 180 | 0 | 0 | 0 | 0 | 0 |
| Veins/meter recovered core | 22.5 | 21.7 | 1.6 | 0.4 | 3.6 | 2.8 | 0.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Percentage of veins | 96.6 | 7.3 | 1.8 | 16.1 | 12.5 | 3.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||
| Expedition 309, Cores 309-1256D-75R through 112R (752–1255 mbsf): | |||||||||||||
| Number of veins | 182.6 | 5160 | 2799 | 290 | 37 | 1901 | 506 | 419 | 21 | 996 | 930 | 16 | 365 |
| Veins/meter recovered core | 28.3 | 15.3 | 1.6 | 0.2 | 10.4 | 2.8 | 2.3 | 0.1 | 5.5 | 5.1 | 0.1 | 2.0 | |
| Percentage of veins | 54.2 | 5.6 | 0.7 | 36.8 | 9.8 | 8.1 | 0.4 | 19.3 | 18.0 | 0.3 | 7.1 | ||
| Hole 1256D, Cores 309-1256D-2R through 170R (250–1255 mbsf): | |||||||||||||
| Number of veins | 406.8 | 10196 | 7664 | 657 | 127 | 2714 | 1135 | 599 | 21 | 996 | 930 | 16 | 365 |
| Veins/meter recovered core | 25.1 | 18.8 | 1.6 | 0.3 | 6.7 | 2.8 | 1.5 | 0.1 | 2.4 | 2.3 | 0.0 | 0.9 | |
| Percentage of veins | 75.2 | 6.4 | 1.2 | 26.6 | 11.1 | 5.9 | 0.2 | 9.8 | 9.1 | 0.2 | 3.6 | ||
| Low-temperature alteration, Cores 309-1256D-75R through 112R (250–981 mbsf): | |||||||||||||
| Number of veins | 68.9 | 2250 | 1956 | 290 | 12 | 524 | 505 | 152 | 13 | 0 | 0 | 0 | 1 |
| Veins/meter recovered core | 32.6 | 28.4 | 4.2 | 0.2 | 7.6 | 7.3 | 2.2 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Percentage of veins | 86.9 | 12.9 | 0.5 | 23.3 | 22.4 | 6.8 | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | ||
| Alteration transition zone, Cores 309-1256D-112R through 122R (981–1027 mbsf): | |||||||||||||
| Number of veins | 15.5 | 399 | 382 | 0 | 5 | 223 | 0 | 13 | 5 | 0 | 0 | 0 | 0 |
| Veins/meter recovered core | 25.8 | 24.7 | 0.0 | 0.3 | 14.4 | 0.0 | 0.8 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | |
| Percentage of veins | 95.7 | 0.0 | 1.3 | 55.9 | 0.0 | 3.3 | 1.3 | 0.0 | 0.0 | 0.0 | 0.0 | ||
| Hydrothermal alteration, Cores 309-1256D-122R through 170R (1027–1255 mbsf): | |||||||||||||
| Number of veins | 98.3 | 2511 | 461 | 0 | 20 | 1154 | 1 | 254 | 3 | 996 | 930 | 16 | 364 |
| Veins/meter recovered core | 25.6 | 4.7 | 0.0 | 0.2 | 11.7 | 0.0 | 2.6 | 0.0 | 10.1 | 9.5 | 0.2 | 3.7 | |
| Percentage of veins | 18.4 | 0.0 | 0.8 | 46.0 | 0.0 | 10.1 | 0.1 | 39.7 | 37.0 | 0.6 | 14.5 | ||
| Hole 1256D breccias (%): | |||||||||||||
| Total | 3.47 | ||||||||||||
| Incipient | 42 | ||||||||||||
| Hyaloclastite “simple” | 18 | ||||||||||||
| Mineralized volcanic | 30 | ||||||||||||
| Hydrothermal | 10 | ||||||||||||
| Secondary minerals in breccias | 39.60 | ||||||||||||
| Secondary minerals from breccias | 1.37 | ||||||||||||
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