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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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