Table T1. Trace-element abundances for igneous basement at Site 1256.
Core, section,
interval (cm)
Unit*
Depth
(mbsf)
Sample description
Trace elements (ppm)
La
Ce
Pr
Nd
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Ba
Th
Nb
Y
Hf
Ta
U
Pb
Rb
Cs
Sr
Sc
Zr
(La/Sm)N†
Zr/Y
Th/U
Cs/Pb
Ba/La
206-1256C-
4R-1, 13–20 S1 245.13 Chert 2.19 0.533 0.363 1.57 0.336 0.104 0.414 0.071 0.479 0.107 0.313 0.048 0.314 0.051 3.0
0.03
0.16
4.57
0.06
0.01
0.04
2.45
 0.49
0.03
 28
0.54
 3.2 4.01
0.70
 0.80 0.01
1.4
7R-5, 42–50 14 271.33 Background–cryptocrystalline basalt 4.33 11.8 1.91 10.9 4.37 1.57 6.12 1.19 7.99 1.77 4.99 0.73 4.64 0.718 12
0.27
4.06
46.5
3.06
0.30
0.12
0.39
 1.37
0.05
 91
48.6
 104 0.612
2.23
 2.3 0.14
2.8
8R-1, 101–108 15 276.51 Background–fine-grained basalt 4.09 11.6 1.99 10.7 4.05 1.37 5.57 1.02 6.92 1.49 4.41 0.66 4.35 0.703 11
0.22
3.87
45.1
2.91
0.26
0.06
0.52
 0.71
0.01
 90
47.4
 104 0.622
2.32
 3.6 0.03
2.6
8R-4, 105–112 18a 280.64 Ponded flow–cryptocrystalline basalt 4.33 12.0 1.96 11.0 4.43 1.60 6.24 1.20 8.13 1.76 4.94 0.74 4.75 0.736 14
0.28
4.17
44.9
3.15
0.30
0.08
0.26
 1.28
0.01
 95
49.6
 106 0.603
2.36
 3.5 0.05
3.2
10R-2, 55–64 18e 295.90 Ponded flow–white patchy alteration 3.96 11.3 1.96 10.7 4.04 1.41 5.57 1.02 6.71 1.45 4.23 0.63 4.13 0.667 17
0.17
3.92
43.7
2.76
0.26
0.04
BD
 4.07
0.03
 85
49.0
 96 0.605
2.20
 3.9  
4.2
12R-4, 20–26 22 317.20 Background–sheet flow below ponded flow 4.12 11.6 1.97 10.8 4.09 1.37 5.58 1.03 6.57 1.39 3.96 0.59 3.80 0.590 12
0.13
3.89
41.9
1.79
0.27
0.02
0.29
 1.00
0.01
 85
50.6
 45 0.622
1.09
 6.9 0.05
3.0
206-1256D-
2R-1, 20–27 1a 276.03 Ponded flow–fine-grained basalt 4.81 13.4 2.31 12.3 4.62 1.54 6.20 1.12 7.19 1.52 4.36 0.65 4.12 0.668 12
0.13
4.63
45.9
2.71
0.31
0.03
0.25
 0.72
0.01
 90
52.3
 87 0.642
1.90
 4.9 0.04
2.5
6R-7, 117–124 1c 303.71 Ponded flow–fine-grained basalt 4.10 11.4 1.95 10.6 3.95 1.42 5.45 1.00 6.49 1.40 4.11 0.62 4.09 0.658 15
0.19
3.88
42.5
2.74
0.25
0.05
0.24
 0.97
0.01
 89
51.1
 96 0.641
2.26
 4.1 0.03
3.5
6R-7, 117–124‡ 1c 303.71 Ponded flow–fine-grained basalt 4.06 11.4 1.87 10.5 4.19 1.56 5.90 1.14 7.69 1.68 4.72 0.69 4.41 0.686 15
0.26
4.09
43.6
2.96
0.30
0.07
BD
 1.02
0.02
 88
50.6
 102 0.597
2.33
 3.7  
3.6
9R-4, 90–97 1c 327.27 Ponded flow–fine-grained basalt 3.86 10.8 1.82 9.66 3.62 1.28 5.08 0.928 6.15 1.35 3.98 0.59 3.92 0.634 12
0.18
3.62
40.7
2.64
0.24
0.05
0.28
 0.99
0.01
 87
48.1
 92 0.659
2.27
 3.8 0.03
3.2
12R-8, 71–79 1d 351.21 Basal unit of ponded flow–microcrystalline 4.18 11.7 2.00 10.8 3.97 1.35 5.54 1.02 6.81 1.48 4.43 0.67 4.33 0.702 13
0.23
3.88
45.4
2.86
0.25
0.06
0.28
 1.18
0.01
 85
51.8
 102 0.650
2.26
 3.7 0.05
3.2
16R-1, 88–95 3 369.78 Black halo + vein 2.57 7.46 1.33 7.43 2.92 1.05 4.14 0.773 5.07 1.12 3.30 0.50 3.41 0.552 5.2
0.14
2.52
33.1
1.99
0.17
0.22
0.26
 0.33
BD
 88
53.2
 69 0.542
2.07
 0.66  
2.0
22R-2, 120–127 4d 408.43 Mesostasis patch 2.38 6.80 1.22 6.64 2.63 0.946 3.71 0.693 4.69 1.03 3.03 0.46 3.05 0.491 5.5
0.13
2.27
30.7
1.84
0.15
0.07
0.30
 0.46
0.01
 77
49.7
 63 0.560
2.04
 1.9 0.03
2.3
24R-1, 132–139 5 420.82 Background–cryptocrystalline basalt 2.91 8.10 1.42 7.69 2.98 1.05 4.17 0.775 5.24 1.15 3.36 0.52 3.44 0.553 11
0.16
2.75
35.4
2.10
0.18
0.05
0.33
 0.18
BD
 79
51.1
 73 0.604
2.07
 3.6  
3.7
27R-1, 130–137 8a 446.70 Dark alteration near vugs 2.88 8.07 1.42 7.74 2.94 1.09 4.17 0.759 4.92 1.06 3.01 0.45 2.98 0.473 9.6
0.16
2.68
31.0
2.13
0.18
0.11
0.28
 0.41
0.01
 87
50.9
 72 0.603
2.32
 1.5 0.05
3.3
28R-1, 116–121 8a 452.06 Background–fresh cryptocrystalline basalt 3.01 8.55 1.49 8.38 3.25 1.20 4.59 0.858 5.67 1.24 3.65 0.55 3.68 0.594 13
0.17
2.96
37.4
2.26
0.20
0.07
0.32
 0.95
0.01
 88
50.4
 79 0.571
2.10
 2.4 0.03
4.5
32R-1, 114–120 8d 476.34 Background–microcrystalline basalt 2.88 7.99 1.40 7.70 3.03 1.09 4.27 0.800 5.30 1.14 3.39 0.51 3.37 0.553 12
0.15
2.63
34.6
2.08
0.18
0.04
0.47
 0.36
BD
 81
47.2
 70 0.587
2.03
 3.7  
4.1
37R-1, 36–43 10 500.46 Patchy alteration 2.79 7.83 1.38 7.62 2.98 1.08 4.16 0.779 5.16 1.14 3.29 0.50 3.30 0.532 9.3
0.15
2.60
33.6
2.07
0.18
0.05
0.24
 0.30
0.01
 81
50.2
 70 0.577
2.07
 3.0 0.02
3.3
37R-1, 111–118 10 501.21 Patchy alteration 2.88 8.15 1.42 8.02 3.14 1.11 4.50 0.815 5.40 1.16 3.44 0.51 3.38 0.535 8.1
0.16
2.77
35.1
2.17
0.19
0.18
0.34
 0.53
0.02
 84
49.5
 75 0.565
2.13
 0.91 0.06
2.8
37R-3, 24–30 10 503.29 Background–not much alteration 2.87 8.06 1.41 7.81 3.06 1.10 4.37 0.803 5.31 1.15 3.37 0.52 3.39 0.546 9.3
0.16
2.73
35.1
2.10
0.18
0.04
0.24
 0.30
BD
 82
47.0
 72 0.579
2.07
 4.1  
3.2
41R-2, 26–33 15 526.26 Background–microcrystalline basalt 2.85 8.03 1.41 7.70 3.07 1.09 4.29 0.792 5.30 1.16 3.35 0.52 3.41 0.553 9.3
0.15
2.64
34.4
2.09
0.18
0.22
0.30
 0.27
0.01
 81
47.3
 70 0.572
2.04
 0.70 0.02
3.3
47R-2, 121–126 19 573.71 Background–cryptocrystalline basalt 2.95 8.31 1.43 7.68 2.87 1.06 3.98 0.723 4.73 1.02 3.00 0.46 2.90 0.462 9.1
0.17
2.89
30.5
1.94
0.19
0.05
0.34
 0.15
BD
 105
45.9
 70 0.634
2.29
 3.2  
3.1
52R-1, 8–15 22 600.78 Background–microcrystalline basalt flow interior 3.79 10.4 1.74 9.53 3.57 1.25 4.87 0.894 5.86 1.26 3.70 0.56 3.68 0.594 17
0.22
3.89
38.1
2.49
0.26
0.07
0.37
 0.43
0.01
 94
45.7
 89 0.654
2.33
 3.1 0.02
4.4
54R-3, 73–81 23 621.76 Background–cryptocrystalline basalt 2.36 6.69 1.18 6.59 2.54 0.949 3.71 0.691 4.54 1.00 2.95 0.45 2.93 0.474 5.3
0.12
2.13
30.2
1.80
0.14
0.03
0.27
 0.60
BD
 79
48.2
 61 0.572
2.03
 3.9  
2.2
57R-2, 117–127 24a 648.02 Highly altered basalt, brick red and blue-green 2.09 5.76 0.91 5.10 2.06 0.802 3.08 0.601 4.21 0.95 2.73 0.42 2.72 0.426 5.7
0.14
2.07
23.8
1.51
0.15
0.05
0.04
 20.7
0.23
 69
40.6
 49 0.626
2.07
 2.9 5.4
2.7
57R-3, 13–18 24a 648.38 Highly altered basalt, brick red 2.67 6.75 1.03 5.84 2.25 0.877 3.26 0.643 4.35 0.93 2.58 0.37 2.34 0.368 38
0.13
1.90
24.2
1.42
0.14
0.06
0.08
 7.5
0.05
 66
39.5
 47 0.731
1.93
 2.1 0.63
14
57R-3, 110–120 24a 649.35 Background–coarse olivine phenocrysts 2.72 7.56 1.30 7.19 2.79 1.00 3.91 0.731 4.84 1.07 3.11 0.47 3.13 0.505 9.4
0.15
2.69
32.0
1.93
0.17
0.04
0.25
 0.34
0.01
 83
45.6
 67 0.602
2.08
 3.7 0.06
3.5
57R-4, 118–125 24b 650.83 Background, olivine-phyric 2.96 8.31 1.46 7.81 3.03 1.09 4.23 0.789 5.24 1.15 3.35 0.51 3.32 0.533 6.5
0.17
2.79
34.4
2.03
0.18
0.04
0.29
 0.18
BD
 86
45.6
 71 0.602
2.05
 4.0  
2.2
57R-4, 118–125‡ 24b 650.83 Background, olivine-phyric 2.83 7.92 1.31 7.47 3.07 1.17 4.41 0.856 5.81 1.28 3.57 0.53 3.37 0.527 6.3
0.19
2.89
33.8
2.07
0.20
0.05
0.22
 0.22
0.01
 84
51.8
 69 0.569
2.04
 3.5 0.03
2.2
60R-2, 29–34 24e 670.38 Background, fine-grained 2.78 7.71 1.33 7.28 2.80 1.03 3.97 0.736 4.83 1.07 3.16 0.48 3.12 0.509 13
0.16
2.61
32.2
1.85
0.18
0.04
0.67
 1.26
0.02
 78
48.9
 65 0.613
2.02
 4.0 0.03
4.6
61R-1, 60–65 25 678.60 Halo 2.72 8.14 1.47 8.05 3.16 1.10 4.45 0.837 5.67 1.23 3.63 0.57 3.85 0.631 7.4
0.16
2.73
35.4
2.26
0.18
0.07
0.55
 0.14
BD
 86
55.4
 77 0.532
2.18
 2.3  
2.7
69R-1, 24–33 26 724.34 Background–cryptocrystalline basalt 2.23 6.38 1.13 6.34 2.55 0.941 3.62 0.684 4.59 1.00 2.91 0.45 2.98 0.482 6.8
0.12
2.08
30.5
1.66
0.14
0.03
BD
 0.09
BD
 77
47.2
 57 0.539
1.86
 3.9  
3.0
74R-2, 102–111 26 749.56 Background–cryptocrystalline basalt 2.52 7.41 1.35 7.49 3.01 1.08 4.33 0.806 5.34 1.16 3.49 0.53 3.54 0.564 7.0
0.12
2.11
35.3
2.02
0.14
0.03
0.26
 0.17
BD
 74
47.4
 69 0.517
1.95
 3.8  
2.8
BAS-206

Leg 206 interlaboratory standard 4.89 13.86 2.37 12.82 4.79 1.62 6.60 1.18 7.88 1.67 4.81 0.736 4.68 0.758 41
0.26
4.56
50.2
3.34
0.58
0.25
0.47
 1.82
0.05
 102
55.3
 121 0.631
2.40
 1.1 0.12
8.4
Chondrite**

REE concentrations in chondrite 0.329 0.855 0.13 0.63 0.203 0.077 0.276 0.0511 0.343 0.077 0.225
0.22 0.034  
 
 
 
 
 
 
 
  
 
  
 
    
 
    
 

Notes: * = lithologic units defined during shipboard core description (Shipboard Scientific Party, 2003). † = La/Sm ratios normalized to chondrite. ‡ = duplicate number indicate replicate analyses using separate splits of the same powder. ** = chondrite rare earth element (REE) concentrations used in normalization (Nakamura, 1974). BD = below detection limit.