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Table T12. Headspace (HS) gas concentrations, Site U1423.

Core, section,
interval (cm)
Top depth
CSF-A (m)
Sample
type
Sediment
volume
(cm3)
CH4
(ppmv)
measured
CH4
(ppmv)
normalized
346-U1423A-
1H-2, 0–5 1.50 HS 4.00 7.95 9.94
1H-5, 0–5 6.00 HS 4.00 1.88 2.35
2H-2, 0–5 8.80 HS 2.00 1.73 4.33
2H-5, 0–5 13.30 HS 4.00 0.00 0.00
3H-2, 0–5 18.30 HS 4.00 3.42 4.28
3H-5, 0–5 22.80 HS 4.00 5.26 6.58
4H-2, 0–5 27.75 HS 3.60 24.41 33.90
4H-5, 0–5 32.25 HS 4.00 97.56 121.95
5H-2, 0–5 37.30 HS 4.00 155.76 194.70
5H-5, 0–5 41.80 HS 4.00 232.16 290.20
6H-2, 0–5 46.80 HS 4.00 350.17 437.71
6H-5, 0–5 51.25 HS 4.00 343.62 429.53
7H-2, 0–5 56.30 HS 3.20 665.77 1040.27
7H-5, 0–5 60.80 HS 4.80 1076.44 1121.29
8H-2, 0–5 65.80 HS 4.00 1377.24 1721.55
8H-5, 0–5 70.30 HS 3.00 1203.62 2006.03
9H-2, 0–5 75.30 HS 3.00 903.74 1506.23
9H-5, 0–5 79.80 HS 3.00 876.44 1460.73
10H-2, 0–5 84.80 HS 3.00 621.05 1035.08
10H-5, 0–5 89.30 HS 3.20 403.45 630.39
11H-2, 0–5 94.30 HS 3.00 253.79 422.98
11H-5, 0–5 98.80 HS 3.00 228.66 381.10
12H-2, 0–5 103.80 HS 3.00 308.96 514.93
12H-5, 0–5 108.30 HS 3.00 180.52 300.87
13H-2, 0–5 113.30 HS 3.00 105.75 176.25
13H-5, 0–5 117.80 HS 3.20 122.16 190.88
14H-2, 0–5 122.80 HS 2.60 30.20 58.08
14H-5, 0–5 127.30 HS 3.20 37.48 58.56
15H-2, 0–5 132.30 HS 3.20 13.72 21.44
15H-5, 0–5 136.80 HS 3.40 10.23 15.04
16H-2, 0–5 141.80 HS 2.80 6.78 12.11
16H-5, 0–5 146.30 HS 3.20 8.25 12.89
17H-2, 0–5 151.30 HS 3.00 6.49 10.82
17H-5, 0–5 155.80 HS 3.60 6.63 9.21
18H-2, 0–5 160.60 HS 3.00 3.93 6.55
18H-5, 0–5 165.10 HS 2.60 3.42 6.58
19H-2, 0–5 170.10 HS 3.00 3.45 5.75
19H-5, 0–5 174.60 HS 3.40 3.82 5.62
20H-2, 0–5 179.60 HS 3.20 2.87 4.48
20H-5, 0–5 184.10 HS 3.40 2.66 3.91
21H-2, 0–5 189.10 HS 3.80 3.39 4.46
21H-5, 0–5 193.60 HS 3.40 3.03 4.46
22H-2, 0–5 198.60 HS 2.80 2.78 4.96
22H-5, 0–5 203.10 HS 2.80 2.95 5.27
346-U1423B-
23H-4, 0–5 196.60 HS 3.00 2.69 4.48
24H-4, 0–5 206.10 HS 3.20 2.29 3.58
25H-4, 0–5 215.60 HS 3.40 3.46 5.09
26H-4, 0–5 225.10 HS 3.20 2.63 4.11
27H-4, 0–5 234.60 HS 3.00 2.77 4.62
28H-4, 0–5 244.10 HS 2.60 3.46 6.65

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