Table
T5. Whole-rock compositions of basalt samples, Hole 1187A.
192-1187A-
Core,
section:
3R-3
4R-2
6R-6
7R-6
9R-4
10R-7
12R-5
Piece:
3B
13B
2C
2
2C
1B
2A
Interval
(cm):
68-70
122-124
105-107
66-70*
56-58
30-32
90-93
Unit/Subunit:
3B
3B
3B
4
5
6
6
Depth (mbsf):
378.12
386.91
410.58
419.96
436.66
449.89
467.45
Major
element (wt%):
SiO2
49.00
49.00
49.50
48.10
49.00
49.80
49.80
TiO2
0.72
0.74
0.72
0.78
0.73
0.72
0.75
Al2O3
15.30
15.30
14.90
16.50
15.20
15.30
15.80
Fe2O3T
10.70
10.80
10.80
11.90
11.10
10.40
10.10
MnO
0.20
0.19
0.18
0.19
0.19
0.17
0.17
MgO
8.79
8.70
9.15
6.87
9.39
8.85
8.78
CaO
12.40
12.60
12.30
13.20
12.50
12.20
12.70
Na2O
1.82
1.83
1.74
2.05
1.78
1.83
1.85
K2O
0.22
0.32
0.04
0.97
0.11
0.03
0.07
P2O5
0.04
0.03
0.04
0.06
0.04
0.04
0.04
Total
99.19
99.51
99.37
100.62
100.04
99.34
100.06
Mg#
0.65
0.65
0.66
0.57
0.66
0.66
0.66
LOI
1.79
2.46
0.86
3.48
1.03
1.20
0.98
CIPW
norms:
Q
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Or
1.3
1.9
0.3
5.8
0.6
0.2
0.4
Ab
15.6
15.7
15.0
16.0
15.1
15.7
15.8
An
33.5
33.0
33.3
33.1
33.4
34.1
34.8
Ne
0.0
0.0
0.0
0.8
0.0
0.0
0.0
Di
23.4
24.5
22.9
26.4
23.5
22.0
23.1
Hy
17.0
14.9
22.6
0.0
16.2
23.4
19.3
Ol
5.7
6.6
2.5
14.2
7.4
1.2
3.2
Il
1.4
1.4
1.4
1.5
1.4
1.4
1.4
Mt
1.9
1.9
1.9
2.1
2.0
1.8
1.8
Ap
0.1
0.1
0.1
0.1
0.1
0.1
0.1
Trace
element (ppm):
Ni
176
185
196
157
171
195
184
Cr
490
492
501
506
467
464
476
V
243
244
242
289
246
235
245
Zr
36
41
39
41
40
38
38
Sc
44
43
43
46
43
43
43
Y
17
19
17
19
18
18
19
Sr
91
89
84
121
89
85
95
Ba
6
5
7
18
6
5
6
Notes: * = highly altered basalt, excluded from Figures F20, F21, F22, and F23. Fe2O3T = total Fe expressed as Fe2O3. For Mg# (= atomic Mg / [Mg + Fe2+]) and CIPW norms, 12% of total iron is assumed to be Fe3+, which is equivalent to Fe2O3 / (Fe2O3 + FeO) = 0.13, or Fe2O3 / FeO = 0.15. LOI = percent weight loss on ignition at 1100°C. All analyses were conducted on ignited samples. This table is also available in ASCII format.