Table T5.
Selected microprobe analyses of olivine, Hole 735B.
Core,
section,
interval (cm):
101R-1
(Piece 7, 106-108)112R-2
(Piece 1, 64-66)130R-3
(Piece 11, 93-95)156R-3
(Piece 5, 51-54)
Lithology:
Olivine
gabbro
Olivine
gabbro
Olivine
gabbro
Olivine
gabbro
SiO2
38.32
37.72
37.38
37.57
37.09
36.95
37.81
38.09
TiO2
0.00
0.01
0.01
0.00
0.01
0.01
0.00
0.02
Al2O3
0.01
0.00
0.00
0.01
0.01
0.00
0.00
0.00
FeO*
25.42
27.28
31.64
31.94
30.86
31.64
27.42
26.77
MnO
0.41
0.46
0.57
0.55
0.54
0.50
0.45
0.43
MgO
36.21
35.11
32.04
31.81
31.69
31.61
35.16
35.51
CaO
0.01
0.02
0.01
0.01
0.01
0.03
0.02
0.00
Na2O
0.00
0.01
0.02
0.01
0.02
0.04
0.00
0.02
K2O
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
Cr2O3
0.00
0.00
0.00
0.00
0.00
0.01
0.00
0.00
NiO
0.09
0.03
0.04
0.03
0.02
0.00
0.07
0.01
Total
100.45
100.64
101.69
101.92
100.27
100.79
100.93
100.85
Cations
(O = 4):
Si
1.006
0.999
1.000
1.003
1.004
0.999
0.999
1.003
Ti
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
Al
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
Fe
0.558
0.604
0.708
0.713
0.699
0.715
0.606
0.590
Mn
0.009
0.010
0.013
0.012
0.012
0.012
0.010
0.010
Mg
1.418
1.386
1.278
1.266
1.279
1.273
1.385
1.394
Ca
0.000
0.000
0.000
0.000
0.000
0.001
0.001
0.000
Na
0.000
0.000
0.001
0.000
0.001
0.002
0.000
0.001
K
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
Cr
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
Ni
0.002
0.001
0.001
0.001
0.000
0.000
0.002
0.000
Total
2.994
3.001
3.000
2.997
2.996
3.002
3.001
2.997
Fo
71.7
69.6
64.4
64.0
64.7
64.0
69.6
70.3
Notes: FeO* = total iron as FeO. Fo = 100 x Mg/(Mg + Fe).