Table T4. Major and trace element compositions of rocks, Holes 1271A and 1271B.
Core, section, interval (cm)
Depth (mbsf)
Piece
Unit
Lithology
Major element oxides (wt%)
LOI
Volatiles (wt%)
SiO2
TiO2
Al2O3
Fe2O3
MgO
MnO
CaO
Na2O
K2O
Total
CO2
H2O
209-1271A-
















1R-1, 73–77 0.73 11
Dunite 44.00 <0.01 0.05 14.15 41.20 0.08 <0.06 0.13 0.02 99.67 11.86 0.11 14.43
4R-2, 32–37 30.09 1
Dunite 38.34 0.02 0.75 11.73 45.77 0.13 <0.06 0.03 0.02 96.80 14.33 0.24 17.57
4R-2, 106–111 30.83 7B
Dunite 38.91 0.02 0.99 11.06 46.16 0.16 <0.06 0.06 0.03 97.40 14.90 0.27* 14.94*
209-1271B-
















5R-1, 19–23 27.89 4 I Brown amphibole gabbro 48.26 3.33 16.15 4.66 12.58 0.22 11.68 2.34 0.87 100.09 1.74 0.13 2.30
8R-1, 39–43 41.09 9 I Gabbro 47.19 0.77 15.70 10.06 10.16 0.30 12.43 1.85 0.09 98.54 2.59 0.13 3.45
8R-1, 65–68 41.35 14 I Dunite 41.33 0.01 0.73 11.16 43.41 0.14 <0.06 0.04 0.01 96.83 13.96 0.25 15.92
10R-1, 109–112 51.59 19 II Harzburgite 43.25 <0.01 0.46 9.77 42.52 0.07 2.11 0.06 <0.01 98.24 13.87 1.54 14.69
12R-1, 134–139 61.44 21 III Impregnated dunite 45.92 0.09 3.35 9.23 35.63 0.14 3.51 0.53 0.02 98.42 8.64 0.21 10.47
17R-1, 105–110 85.55 16 III Harzburgite 42.48 0.02 0.39 9.19 45.78 0.08 0.15 0.03 <0.01 98.13 13.74 0.30 16.26
17R-1, 107–109 85.57 16 III Harzburgite 42.71 0.02 0.43 7.71 46.50 0.10 0.07 0.05 <0.01 97.60 14.16 0.27 17.49
Core, section, interval (cm)
Depth (mbsf)
Piece
Unit
Lithology
Trace elements (ppm)
S
Cr
Ni
Ba
Sr
V
Y
Zr
Sc
Co
209-1271A-













1R-1, 73–77 0.73 11
Dunite 762 50 2849 <39 5 6.3 <2 3 3.2 191
4R-2, 32–37 30.09 1
Dunite NA 9123 2245 <39 <5 36.3 <2 5 4.8 160
4R-2, 106–111 30.83 7B
Dunite NA 7037 2090 <39 <5 30.2 <2 <2 5.6 124















209-1271B-













5R-1, 19–23 27.89 4 I Brown amphibole gabbro NA 69 598 498 279 390.4 48 122 60.2 115
8R-1, 39–43 41.09 9 I Gabbro 758 640 223 65 84 238.7 19 40 37.2 48
8R-1, 65–68 41.35 14 I Dunite 981 6075 2737 139 <5 34.7 <2 2 5.8 143
10R-1, 109–112 51.59 19 II Harzburgite 875 2711 2952 <39 290 33.1 <2 2 8.2 126
12R-1, 134–139 61.44 21 III Impregnated dunite 1075 3559 1792 <39 6 88.3 16 35 19.7 101
17R-1, 105–110 85.55 16 III Harzburgite 1330 2536 2599 <39 <5 24.3 <2 <2 6.0 <32
17R-1, 107–109 85.57 16 III Harzburgite 1269 2865 2690 <39 <5 26.2 <2 <2 5.8 <32

Notes: * = analyzed using smaller sample sizes for improved H2O calibration. NA = not analyzed. This table is also available in ASCII.