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Table T14. Headspace (HS) gas concentrations, Site U1425.



Core, section,
interval (cm)

Top depth
CSF-A (m)

Sample
type
Sediment
volume
(cm3)		 CH4
(ppmv)
GC3
measured		 CH4
(ppmv)
NGA-FID
measured		 CH4
(ppmv)
GC3
normalized		 CH4
(ppmv)
NGA-FID
normalized
346-U1425A-
1H-2, 0–5 1.50 HS 3.8   3   3
1H-5, 0–5 6.00 HS 4.4   4   5
346-U1425B-
1H-2, 0–5 1.50 HS 4.0   0   0
1H-5, 0–5 6.00 HS 4.0   3   4
2H-2, 0–5 10.30 HS 4.2   5   6
2H-5, 0–5 14.80 HS 4.5   5   6
2H-6, 0–5 16.30 HS 4.0   7   9
3H-2, 0–5 19.80 HS 3.0   5   8
3H-5, 0–5 24.30 HS 4.0   8   10
4H-2, 0–5 29.30 HS 3.6   7   9
4H-5, 0–5 33.80 HS 3.2   6   9
5H-2, 0–5 38.80 HS 3.0   5   8
5H-5, 0–5 43.30 HS 3.0   3   5
6H-2, 0–5 48.30 HS 3.0   8   13
6H-5, 0–5 52.80 HS 3.0   10   17
7H-2, 0–5 57.80 HS 3.2   25   39
7H-5, 0–5 62.30 HS 3.0   446   744
8H-2, 0–5 67.30 HS 3.0   1,175   1,959
8H-5, 0–5 71.80 HS 3.0   1,068   1,779
9H-2, 0–5 76.80 HS 3.0   2,725   4,541
9H-5, 0–5 81.30 HS 3.0   3,072   5,121
10H-2, 0–5 86.30 HS 3.0   3,589   5,981
10H-5, 0–5 90.80 HS 3.0   3,183   5,305
11H-2, 0–5 95.80 HS 3.2   3,043   4,755
11H-5, 0–5 100.30 HS 3.0   1,215   2,025
12H-1, 71–76 104.51 HS —   3,347   —
13X-CC, 11–16 106.21 HS —   4,931   —
14H-2, 0–5 107.50 HS 3.0   4,274   7,124
16X-1, 97–102 116.57 HS 3.2   4,462   6,972
17H-2, 0–5 119.30 HS 3.0   6,892   11,487
19H-2, 0–5 128.63 HS 4.0   7,648   9,560
20H-2, 0–5 133.40 HS 4.0   7,527   9,409
21H-2, 0–5 138.10 HS 4.0   8,848   11,060
22H-2, 0–5 147.60 HS 3.8   8,932   11,753
23H-2, 0–5 157.10 HS 3.5   5,160   7,371
24H-2, 0–5 166.60 HS 3.0   7,617   12,694
25H-2, 0–5 176.10 HS 3.0   9,265   15,442
26H-2, 0–5 185.60 HS 4.0 13,855   17,319  
27H-2, 0–5 195.10 HS 3.0 7,042   11,736  
28H-2, 0–5 204.60 HS 3.2 10,869   16,983  
29H-2, 0–5 213.10 HS 3.2 10,531   16,455  
30H-2, 0–5 222.60 HS 3.0 7,836   13,059  
32X-2, 0–5 232.10 HS 2.5 6,472   12,944  
33H-2, 0–5 235.80 HS 2.8 9,552   17,057  
34H-2, 0–5 245.30 HS 3.3 10,824   16,400  
35H-2, 0–5 254.80 HS 2.5 4,826   9,651  
36H-3, 0–5 264.86 HS 3.0 5,284   8,807  
37H-2, 0–5 269.00 HS 3.0 6,636   11,060  
38H-2, 0–5 273.68 HS 3.0 8,997   14,994  
39H-2, 0–5 278.40 HS 3.0 7,343   12,238  
40X-2, 0–5 283.10 HS 3.0 2,749   4,581  
41H-2, 0–5 286.40 HS 3.0 12,997   21,662  
42H-2, 0–5 291.10 HS 3.4 9,990   14,691  
43H-2, 0–5 295.80 HS 3.4 13,409   19,720  
44H-2, 0–5 300.50 HS 2.6 9,389   18,056  
45H-2, 0–5 305.13 HS 3.4 8,125   11,949  
46H-2, 0–5 309.90 HS 3.0 7,752   12,920  
47H-2, 0–5 314.60 HS 3.0 2,677   4,462  
48H-2, 0–5 319.30 HS 3.0   10,502   17,503
49H-2, 0–5 324.00 HS 2.6   3,246   6,241
50H-2, 0–5 328.70 HS 2.6   5,949   11,440
51H-2, 0–5 333.40 HS 3.6   1,919   2,666
52H-2, 0–5 338.10 HS 2.6   2,461   4,733
53H-2, 0–5 342.80 HS —   4,421   —
54H-2, 0–5 347.50 HS —   3,248   —
55X-2, 0–5 352.20 HS 2.7   2,656   4,918
56X-2, 0–5 360.20 HS 2.3   5,986   13,013
57X-1, 41–46 368.81 HS 3.0   9,697   16,161
59X-2, 0–5 389.30 HS 3.6   3,756   5,217
60H-2, 0–5 399.00 HS 4.0   3,864   4,830
61X-1, 137–142 403.57 HS 4.0   2,247   2,808

GC3 = gas analyzer (C1–C3), NGA = natural gas analyzer (C1–C7), FID = flame ionization detector. — = not measured.

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