Press to Close

Table 2. Petrophysical, petrological, and geochemical data, Hole 990A.

Core, section:

Interval (cm):

Unit:

Depth (mbsf):

Depth from unit top (m):

 8R-1

96-98

2

232.1

 

0.9

 8R-2

130-132

2

233.8

 

2.6

 8R-3

126-128

2

235.3

 

4.1

 8R-5

3-5

2

236.4

 

5.2

 9R-2

5-7

2

242.2

 

11.0

 10R-1

62-64

2

246.3

 

15.1

 11R-1

10-12

2

250.4

 

19.2

 12R-2

75-77

3

A257.2

 

1.2

 13R-1

44-46

3A

260.4

 

4.4

 13R-2

48-50

3A

262.0

 

6.0

 13R-2

125-127

3A

262.7

 

6.7

 13R-3

31-33

3A

263.37

 

.3

 13R-3

62-64

3A

263.6

 

7.6

 14R-1

49-51

3A

265.1

 

9.1

 21R-2

30-32

9

309.9

 

0.5

 21R-3

120-122

9

312.3

 

2.9

 21R-4

22-24

9

312.8

 

3.4

 21R-4

57-59

9

313.2

 

3.8

Vp (km/s)

3.53
4.37
4.69
5.11
5.07
5.11



3.69
3.62
4.40
5.00
3.24
4.23
4.04
4.09

Vp smooth (km/s)
2.40
4.00
5.00
5.60
5.90
5.90
6.10
2.50
2.40
2.50
4.40
4.60
5.00
5.80
4.10
4.80
4.70
4.80

Vp nearest (km/s)
2.30
4.15
5.02
5.35
5.88
5.98
6.10
2.42
2.45
3.53
4.30
4.09
5.22
6.02
4.16
4.89
4.59
4.81

Vs (km/s)

2.16
2.64
2.24
2.90
2.34
2.90



2.13
2.17
2.47
2.74
2.04
2.43
2.30
2.51

Bulk density (g/cm3)

2.57
2.71
2.83
2.91
2.87
2.90



2.54
2.51
2.83
2.88
2.33
2.42
2.54
2.66

Dry Density (g/cm3)

2.52
2.49
2.79
2.89
2.85
2.89



2.44
2.43
2.80
2.86
2.22
2.35
2.51
2.60

Porosity (%)

5.43

3.60
1.57
2.43
1.56



9.96
8.29
3.51
1.48
10.47
7.42
2.80
6.11

Susceptibility (10-6 SI)


27721

16707
16158
17427
7045


22346
15480
32654
11127
8674



Remanence (mA/M)


597

111
314
1572
64


3557
5523
338
797
5187



Q-factor (F = 50,000 nT)




0.55

0.17
0.49
2.30
0.23


4.05
9.09
0.26
1.82
15.23



Titanomagnetite




X
X
X
X
X










X
X








Magnetite












X










X
X






X

Hematite




X
X
X
















X








Other magnetic minerals








Rutile
Martite
Ilmenite




























































Geochemical group
1
2
2
3
3
3
3
1
1
1
2
2
3
3
2
3
3
3

Clinopyroxene (%)
Tr
48
42
41
35
38
39
Tr
Tr
Tr
51
39
38
35
42
38
38
36

Olivine (%)
Tr
Tr
3
Tr
6
Tr
4
Tr
Tr
Tr
Tr
Tr
6
5
Tr
6
Tr
Tr

Clay (%)
78
7
6
Tr
Tr
Tr
Tr
72
68
62
61
6
Tr
Tr
13
Tr
Tr
Tr

Iron oxide (%)
22
11
10
7
18
13
12
28
32
38
11
18
13
20
17
13
6
16
































SiO2
49.97
49.08
48.98
49.43
49.75
49.49
48.53
49.54
48.91
48.79
48.63
48.94
48.19
49.74
50.70
49.49
49.72
50.05

Al2O3
17.15
15.01
15.11
15.51
15.40
15.46
14.72
17.33
16.01
15.87
15.84
15.32
14.33
14.86
13.50
13.12
15.36
15.26

Fe2O3
13.87
12.88
13.03
11.49
12.07
11.86
12.10
13.93
14.63
14.41
12.89
13.20
12.67
12.71
12.45
12.91
10.12
10.24

MnO
0.16
0.21
0.20
0.18
0.19
0.17
0.21
0.19
0.19
0.19
0.20
0.21
0.23
0.20
0.19
0.23
0.22
0.22

MgO
4.92
6.67
6.77
6.35
6.71
6.84
6.39
5.48
6.30
6.82
6.55
7.27
6.87
7.43
7.29
8.69
7.92
7.99

CaO
2.42
9.55
10.84
12.04
11.88
11.85
11.70
3.70
4.87
5.61
10.75
8.72
11.33
11.50
10.41
10.78
11.69
11.73

Na2O
1.92
2.02
2.13
2.23
2.22
2.29
2.00
1.64
1.59
1.40
1.98
1.59
1.89
2.08
2.00
1.82
2.25
2.15

K2O
0.34
0.50
0.37
0.21
0.22
0.17
0.15
0.21
0.24
0.26
0.38
0.27
0.21
0.18
0.24
0.16
0.11
0.09

TiO2
1.06
1.00
1.04
0.99
0.94
0.94
0.96
1.04
1.09
1.04
0.97
0.94
0.85
0.91
0.90
0.89
0.94
0.88

P2O5
0.04
0.08
0.09
0.11
0.09
0.08
0.08
0.03
0.06
0.02
0.07
0.06
0.06
0.07
0.09
0.07
0.08
0.08

LOI
6.41
2.23
0.77
0.36
0.04
0.08
0.01
6.40
5.61
5.25
1.61
3.29
0.55
0.59
1.60
1.64
0.56
0.99

SUM
98.26
99.23
99.33
98.90
99.51
99.23
96.85
99.49
99.50
99.66
99.87
99.81
97.18
100.27
99.37
99.80
98.97
99.68

Notes: The maximum thickness is the sum of recovered and not recovered section in cores with breccia. LOI = loss on ignition. Tr = trace.

Press to Close