Table T5. Concentrations of methane, ethane, ethylene, and propane in headspace gas, Holes 1251B, 1251C, and 1251D.
Core, section,
interval (cm)
Depth
(mbsf)
C1
(ppmv)
C2
(ppmv)
C2=
(ppmv)
C3
(ppmv)
C1/C2
C1
(mM)
204-1251B-






1H-1, 0-5 0.00 178



0.1
1H-2, 0-5 1.50 28,058 0.7

39,518 5.0
1H-3, 0-5 3.00 28,800 0.7

40,563 5.6
1H-4, 0-5 4.50 63,765 1.7

38,413 5.9
1H-5, 0-5 6.00 39,020 1.3

30,248 4.0
1H-6, 0-5 7.50 14,283



2.7
3H-2, 0-5 20.03 9,728



2.0
3H-5, 0-5 24.51 3,973



0.9
4H-3, 0-5 31.10 14,966
0.3

2.8
4H-6, 0-5 35.60 10,984



1.9
5H-3, 0-5 40.51 13,538



1.8
5H-6, 0-5 44.96 11,843



1.8
6H-3, 0-5 49.32 16,360



2.2
6H-6, 0-5 53.71 6,506



1.9
7H-3, 0-5 59.60 13,459



1.8
7H-6, 0-5 64.10 5,868



1.6
8H-3, 0-5 69.10 15,398 0.7

20,808 2.1
8H-6, 0-5 73.48 1,926



0.3
10H-2, 0-5 86.60 15,072 0.6 0.5
27,404 2.3
11H-3, 0-5 97.04 8,259



3.4
13H-3, 0-5 108.75 16,337



2.5
13H-6, 0-5 113.05 22,896 1.2 0.9
18,922 3.1
14H-3, 0-5 118.11 11,008 1.5

7,388 1.6
14H-6, 0-5 122.61 22,061 1.4 0.6
15,986 2.7
15H-3, 0-5 128.10 16,986 1.3 0.7
12,966 2.7
15H-6, 0-5 132.54 12,950 0.9 0.9
15,235 2.6
16H-3, 0-5 137.60 11,679 0.7

15,782 1.9
16H-6, 0-5 142.01 12,477 0.7

18,083 4.2
17H-3, 0-5 147.10 15,445
0.4

3.2
17H-6, 0-5 151.10 12,477 0.7 0.4
18,083 2.4
19H-3, 0-5 158.36 81,577 2.2 0.4
37,593 13.2
20H-3, 0-5 166.18 11,398 1.0

11,873 1.9
22H-3, 0-5 175.70 1,266



0.2
23H-3, 0-5 185.20 13,044 0.6

21,384 2.3
26X-3, 0-5 207.20 11,765 10.6

1,110 2.0
27X-3, 0-5 216.50 19,214 8.9 0.6
2,159 2.9
27X-6, 0-5 221.00 14,570 9.4 0.8
1,550 2.5
28X-3, 0-5 226.10 16,110 13.1 0.8
1,230 2.4
29X-3, 0-5 235.80 62,691 14.6 0.5
4,294 9.6
30X-3, 0-5 245.40 568



0.1
31X-3, 0-5 255.01 24,794 16.0 2.1
1,552 3.7
32X-3, 0-5 264.70 14,622 16.2 1.5
902 2.2
33X-3, 0-5 274.30 20,345 21.8 0.7
932 2.9
34X-3, 0-5 283.98 11,035 9.5 0.8
1,166 3.0
36X-3, 0-5 295.60 16,685 25.1 1.6
666 2.7
37X-3, 0-5 303.60 14,719 18.1 0.9
811 2.2
38X-4, 0-5 314.80 14,707 26.1 0.3 3.9 563 2.6
39X-4, 0-5 324.40 15,703 14.6 0.6
1,077 3.9
41X-3, 0-5 333.60 19,691 17.1
1.1 1,153 4.2
42X-4, 0-5 343.70 39,152 29.2

1,341 6.0
43X-3, 0-5 351.80 23,779 22.6
4.9 1,052 3.6
44X-3, 0-5 361.40 28,771 26.5 1.2
1,086 4.2
45X-4, 0-5 372.50 6,510 4.7

1,373 1.1
46X-4, 0-5 382.10 16,505 7.5

2,204 3.4
47X-4, 0-5 391.80 13,957 9.9 0.8
1,411 2.5
49X-4, 0-5 402.40 3,099 1.7

1,823 0.8
50X-4, 0-5 411.00 5,756 4.3
0.8 1,342 1.4
51X-4, 0-5 420.70 19,309 9.2
0.7 2,092 3.9
52X-4, 0-5 430.30 22,026 11.3

1,951 5.3
53X-4, 0-5 439.98 14,457 7.8

1,851 2.9
204-1251C-






1H-1, 0-5 0.00 138



0.0
1H-2, 0-5 1.50 188



0.0
1H-3, 0-5 3.00 48



0.0
1H-4, 0-5 4.50 8,669



1.8
1H-5, 0-5 6.00 44,809



10.2
1H-6, 0-5 7.50 42,241 1.03

41,011 8.2
2X-1, 0-5 8.10 38,017 0.73

52,078 8.6
2X-2, 0-5 9.60 39,561 0.88

44,956 8.3
2X-3, 0-5 10.67 29,845 0.77

38,760 5.9
2X-4, 0-5 12.17 23,092 0.74

31,205 4.8
204-1251D-






15H-4, 0-5 120.90 19,997 0.73

27,393
16H-2, 0-5 127.40 17,853 0.91

19,619
17H-4, 0-5 139.90 23,582 1.49

15,827
18H-2, 0-5 145.94 7,873 0.49

16,067
19H-3, 0-5 156.51 16,220 1.08

15,019
20H-3, 0-5 166.38 14,670 0.79

18,570
22H-1, 0-5 175.40 18,489 1.06

17,442
22H-2, 0-5 176.87 12,822 0.82

15,637
23H-1, 0-5 179.10 9,073 0.55

16,496
23H-4, 0-5 183.57 11,167 0.81

13,786
24H-2, 0-5 189.62 9,844




24H-4, 0-5 192.62 9,139 0.51

17,920
25H-2, 0-5 199.70 9,810 7.84

1,251
25H-4, 0-5 202.70 22,295 19.92

1,119
26H-4, 0-5 210.63 10,633 6.10

1,743
27H-4, 0-5 221.30 10,805 7.44

1,452

Note: C1 = methane, C2 = ethane, C2= = ethylene, C3 = propane.