Table
T8. Major element oxides with selected trace elements, Hole 1189B.
Ignited
rock powder composition*:
Major
element oxide (wt%):
SiO2
41.99
50.54
70.59
72.00
69.51
78.07
71.56
73.23
TiO2
0.95
0.55
0.44
0.45
0.44
0.31
0.45
0.45
Al2O3
24.76
19.71
14.11
14.20
14.06
10.40
13.88
13.56
Fe2O3
15.25
14.08
4.87
4.85
4.94
3.58
4.48
4.11
MnO
0.04
0.03
0.10
0.14
0.10
0.07
0.10
0.14
MgO
7.73
3.87
1.56
1.13
1.48
1.40
1.65
1.49
CaO
0.26
0.05
1.71
1.95
1.66
0.25
1.49
1.37
Na2O
0.42
0.48
4.03
4.56
3.76
1.45
3.98
3.21
K2O
4.75
7.79
2.05
1.92
2.55
3.59
2.59
3.37
P2O5
0.40
0.38
0.34
0.36
0.35
0.34
0.36
0.36
Total
(wt%):
96.55
97.48
99.79
101.57
98.85
99.45
100.54
101.28
LOI
(wt%):
4.77
9.00
1.42
0.99
0.88
2.03
1.09
1.22
Trace
element (ppm):
Zr
212
200
138
139
134
113
158
157
Y
66
49
36
35
35
29
38
39
Sr
18
76
274
283
266
155
263
248
Zn
105
20
76
135
52
1416
204
152
Cu
114
13
13
23
83
681
43
315
Ba
685
8835
508
425
726
4881
646
949
Whole
rock composition:
Major
element oxide (wt%):
SiO2
39.98
45.99
69.58
71.29
68.89
76.49
70.78
72.33
TiO2
0.90
0.50
0.43
0.45
0.43
0.30
0.44
0.44
Al2O3
23.58
17.94
13.91
14.06
13.94
10.19
13.73
13.40
Fe2O3
14.52
12.82
4.80
4.81
4.90
3.51
4.43
4.06
MnO
0.04
0.03
0.10
0.14
0.10
0.07
0.10
0.14
MgO
7.37
3.52
1.54
1.12
1.47
1.37
1.63
1.47
CaO
0.25
0.04
1.68
1.93
1.65
0.24
1.47
1.35
Na2O
0.40
0.44
3.97
4.52
3.73
1.42
3.94
3.17
K2O
4.52
7.09
2.02
1.90
2.53
3.52
2.56
3.33
P2O5
0.39
0.35
0.33
0.36
0.35
0.33
0.36
0.35
Total
S (wt%):
8.23
8.95
0.16
0.01
0.02
1.00
0.10
0.03
Total
H2O+ (wt%):
6.03
3.23
1.12
0.64
0.98
1.34
1.23
1.12
Swater-soluble
sulfate (wt%):
2.33
0.05
0.02
0.02
0.02
0.00
0.00
0.04
Notes: Rock type: AD = altered dacite. Alteration type: GSC = green silica-clay, Sil = silicified. * = all samples ignited for 6 hr at 600°C and then for 4 hr at 1050°C. The upper portion of the table gives abundances in the ignited powder, whereas the lower portion contains original rock compositions. Water, total sulfur, and loss on ignition (LOI) are reported in weight percent of unignited powder. Analyses of samples containing more than 1 wt% total S should be used as general compositional guides, and not as absolute values. LOI was conducted at 1050°C for 4 hr.