Table T4. Elemental content, mineral composition, LOI, and Mg# of representative basement rocks, Hole 1201D.
 
Core, section:
45R-5
46R-1
46R-1
46R-1
46R-2
46R-4
46R-4
46R-5
47R-2
47R-2
47R-3
47R-3
48R-1
48R-2
48R-2
Interval (cm):
Piece:
104-107
1
108-110
8
134-136
10
138-140
10
108-110
5B
24-27
6A
31-33
7
58-60
4B
85-87
10
124-126
16
83-86
7
121-124
13
48-50
2C
74-76
1D
135-138
5C
Depth (mbsf):
509.90
513.98
514.24
514.28
515.48
517.50
517.57
519.34
524.45
524.84
525.91
526.29
532.18
533.18
533.79
Rock type:
Basalt
Basalt
Basalt
Basalt
Basalt
Hyaloclastite
Hyaloclastite
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Major element oxides (wt%):












SiO2 51.38 47.66 51.76 50.74 50.42 50.76 49.70 49.38 49.78 49.60 49.20 49.45 49.37 49.85 49.35
TiO2 0.90 0.97 1.02 0.90 0.91 1.01 0.77 0.89 0.91 0.89 0.96 0.94 0.92 0.92 0.92
Al2O3 16.27 17.17 16.23 16.19 16.80 17.02 17.29 17.18 16.03 16.36 16.28 16.07 15.62 15.96 15.70
Fe2O3T 9.15 9.51 9.76 8.83 8.80 10.08 10.53 8.72 9.16 9.10 9.29 10.48 8.99 9.92 10.65
MnO 0.16 0.16 0.15 0.15 0.14 0.16 0.14 0.15 0.14 0.14 0.20 0.20 0.17 0.20 0.22
MgO 6.08 7.38 6.76 7.18 7.68 7.39 5.22 7.87 8.40 8.64 8.08 8.23 8.18 8.52 8.38
CaO 14.05 12.13 7.35 9.69 11.86 7.92 6.67 11.27 9.05 11.01 12.03 13.16 13.15 13.70 13.26
Na2O 2.83 2.98 5.48 4.00 2.77 4.75 4.73 2.83 3.68 3.15 2.06 2.13 2.09 2.13 2.08
K2O 0.65 0.89 1.25 1.11 1.13 1.18 2.84 1.14 1.31 1.26 0.48 0.57 0.24 0.26 0.35
P2O5 0.19 0.21 0.13 0.20 0.04 0.12 0.06 0.15 0.16 0.22 0.13 0.10 0.09 0.07 0.09
Total: 101.65 99.07 99.90 99.00 100.56 100.39 97.95 99.58 98.61 100.37 98.70 101.34 98.82 101.54 100.99
Trace elements (ppm):













Sc 41.88 47.63 48.34 42.57 45.74 46.09 36.02 43.68 46.85 46.37 46.39 41.96 45.14 42.48 41.65
V 237.61 293.88 234.03 242.17 252.86 263.78 98.31 239.87 283.50 279.92 303.60 260.17 277.37 249.63 259.40
Cr 342.37 348.12 359.72 330.21 397.81 363.86 165.05 360.39 351.20 324.20 414.40 409.93 379.50 397.24 407.38
Ni 71.22 — 72.16 73.05 142.42 88.78 — 106.27 — — — — — — —
Sr 109.43 145.67 26.58 64.69 223.28 51.86 41.14 134.39 86.83 102.95 80.87 80.75 77.71 80.06 80.04
Y 26.58 25.81 28.37 23.84 22.69 28.11 8.95 22.95 26.82 24.22 25.69 24.95 23.90 23.20 24.57
Ba 14.48 21.32 26.18 19.73 22.34 24.54 16.69 23.50 25.99 26.01 14.94 12.51 11.50 10.86 10.44
Zr 50.46 50.71 56.74 51.93 52.23 56.44 46.79 48.77 50.60 47.07 47.18 48.17 44.58 45.98 47.10
LOI: 3.32 5.87 6.47 5.02 5.87 6.55 11.85 5.14 4.87 6.2 1.76 1.83 1 1.4 0.97
CIPW-normative minerals (wt%):












or 3.82 5.27 7.39 6.56 6.69 6.99 16.77 6.72 7.72 7.46 2.86 3.40 1.42 1.54 2.06
ab 23.84 17.33 33.49 29.09 22.54 30.33 22.39 22.09 26.47 20.85 17.45 17.99 17.66 18.02 17.57
an 29.78 30.83 15.99 22.96 30.05 21.61 17.58 30.80 23.38 26.77 33.72 32.61 32.55 33.23 32.48
ne 0.07 4.28 6.98 2.57 0.49 5.35 9.55 1.02 2.52 3.15 0.00 0.00 0.00 0.00 0.00
di 31.70 22.81 16.04 19.35 23.19 13.79 12.53 19.61 16.58 21.42 20.41 26.14 26.05 27.83 26.66
hy 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 14.76 4.83 11.84 6.86 7.49
ol 7.92 13.74 15.22 13.99 13.49 17.48 14.80 15.04 17.46 16.16 4.95 11.64 5.00 9.56 10.00
mt 1.58 1.64 1.68 1.52 1.52 1.74 1.82 1.50 1.58 1.57 1.60 1.81 1.55 1.71 1.84
il 1.70 1.85 1.94 1.71 1.73 1.92 1.46 1.69 1.73 1.70 1.83 1.78 1.75 1.75 1.74
ap 0.45 0.49 0.32 0.49 0.08 0.28 0.13 0.35 0.39 0.51 0.30 0.23 0.22 0.18 0.22
Total: 100.86 98.24 99.05 98.23 99.79 99.51 97.03 98.83 97.82 99.58 97.89 100.42 98.04 100.67 100.06
Mg#: 59.89 63.55 60.91 64.62 66.23 62.23 52.71 66.96 67.33 68.09 66.15 63.84 67.18 65.89 63.88
 
Core, section:
48R-3
48R-4
49R-1
49R-2
49R-2
51R-1
52R-1
53R-1
54R-1
54R-1
54R-2
54R-2
55R-1
55R-1
55R-2
Interval:
Piece:
77-79
7C
70-72
13
144-147
14C
28-30
6
131-133
14
22-23
4
78-80
7A
116-118
17A
43-45
4
69-71
9
39-41
4C
118-120
9
43-45
5G
103-106
5R
95-97
8
Depth (mbsf):
534.71
536.04
542.74
543.08
544.11
554.22
561.48
571.46
579.93
580.19
581.07
581.86
588.53
589.13
590.51
Rock type:
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Basalt
Major element oxides (wt%):












SiO2 50.01 50.79 49.76 50.53 48.35 47.49 50.14 50.01 50.07 50.51 49.54 50.01 50.30 50.32 49.65
TiO2 0.92 0.91 0.92 0.93 0.88 0.88 0.94 0.95 0.97 1.01 0.94 0.94 0.90 0.91 0.96
Al2O3 15.87 15.97 15.97 16.15 15.45 15.38 16.29 16.39 16.61 17.24 16.32 16.44 15.45 15.72 16.43
Fe2O3T 10.03 10.24 8.66 9.51 8.83 8.29 10.03 10.42 10.64 10.81 10.54 9.62 9.23 9.40 9.95
MnO 0.21 0.21 0.17 0.22 0.19 0.17 0.21 0.22 0.17 0.16 0.23 0.18 0.18 0.18 0.18
MgO 8.71 8.90 8.07 8.81 8.43 7.93 8.31 7.91 6.14 5.83 7.69 7.44 8.34 8.15 6.64
CaO 13.81 13.89 14.06 13.65 13.19 12.16 13.25 13.84 12.95 11.79 13.66 14.11 13.39 13.84 13.17
Na2O 2.11 2.14 2.02 2.13 1.83 1.82 2.18 1.96 1.85 2.32 2.02 1.98 2.06 2.08 2.58
K2O 0.18 0.23 0.26 0.30 0.29 0.36 0.48 0.64 1.41 1.49 0.67 0.45 0.18 0.19 0.75
P2O5 0.05 0.08 0.09 0.09 0.10 0.05 0.10 0.09 0.14 0.13 0.08 0.09 0.09 0.08 0.12
Total: 101.90 103.38 99.97 102.32 97.54 94.53 101.93 102.43 100.97 101.29 101.70 101.26 100.13 100.88 100.44
Trace elements (ppm):












Sc 39.46 42.31 41.64 43.70 42.29 43.03 43.63 45.01 45.73 46.00 43.90 43.89 41.63 41.66 48.13
V 246.46 261.18 257.09 259.83 243.91 239.52 270.05 285.75 286.13 323.18 286.67 281.78 247.92 260.40 300.44
Cr 416.84 420.80 426.10 431.81 411.17 398.62 409.55 425.17 437.53 460.29 410.97 435.95 415.39 423.66 420.87
Ni — — 130.22 — — — — — 74.03 90.10 — 94.71 166.75 124.23 88.36
Sr 79.41 79.71 82.14 80.52 78.35 77.66 83.71 81.52 84.56 91.97 81.47 82.14 79.31 79.07 108.70
Y 23.32 24.32 24.01 24.91 23.42 23.63 24.93 25.10 27.89 30.56 24.00 23.44 23.29 23.42 25.27
Ba 10.79 11.61 9.54 10.98 11.38 11.89 11.25 13.50 21.00 21.14 15.15 11.79 11.26 8.17 15.99
Zr 44.46 47.91 47.70 43.93 45.69 43.22 50.09 52.39 50.00 50.90 44.47 46.83 44.77 44.30 48.53
LOI: 1.24 0.85 1.65 1.65 1.58 1.78 1.73 2.31 2.109 3.71 2.25 1.32 2.14 1.89 3.58
CIPW-normative minerals (wt%):












or 1.07 1.37 1.53 1.78 1.73 2.13 2.85 3.78 8.35 8.82 3.99 2.66 1.06 1.11 4.45
ab 17.89 18.11 17.08 18.01 15.46 15.38 18.46 16.62 15.66 19.64 17.05 16.77 17.41 17.62 21.27
an 33.28 33.29 33.74 33.63 33.10 32.73 33.23 34.01 32.83 32.21 33.50 34.64 32.39 33.00 31.01
ne 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.31
di 28.40 28.50 28.70 27.20 25.67 22.11 25.92 27.81 25.07 20.96 27.56 28.32 27.14 28.53 27.51
hy 7.32 7.98 9.37 8.62 11.95 15.80 7.03 5.76 8.54 6.73 4.11 8.48 14.69 11.54 0.00
ol 9.49 9.53 5.33 8.65 5.43 2.44 9.83 9.74 5.56 7.91 10.77 5.89 3.10 4.71 11.20
mt 1.73 1.77 1.49 1.64 1.52 1.43 1.73 1.80 1.84 1.86 1.82 1.66 1.59 1.62 1.72
il 1.74 1.73 1.74 1.76 1.67 1.67 1.78 1.80 1.84 1.91 1.79 1.78 1.72 1.72 1.82
ap 0.11 0.20 0.22 0.21 0.24 0.11 0.24 0.21 0.34 0.31 0.19 0.22 0.21 0.20 0.28
Total: 101.02 102.48 99.22 101.49 96.77 93.80 101.05 101.52 100.04 100.35 100.78 100.42 99.32 100.06 99.57
Mg#: 66.14 66.15 67.68 67.56 68.21 68.25 65.07 63.03 56.48 54.79 62.14 63.50 67.01 66.10 60.00

Notes: Element compositions were determined by inductively coupled plasma-atomic emission spectroscopy. LOI = loss on ignition. Mg# = 100 x Mg2+/(Mg2+ + Fe2+). Calculated CIPW-normative compositions: or = norm orthoclase, ab = norm albite, an = norm anorthite, ne = norm nepheline, di = norm diopside, hy = norm hyperthene, ol = norm olivine, mt = norm magnetite, il = norm ilmenite, ap = norm apatite.