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Table 2. Residual hydrocarbon gas concentrations (µL/L) at Sites 991, 992, 993, and 996.

Core, section Depth (mbsf) C1 C2= C2 C3 C3= iC4 n-C4 neoC5 iC5 n-C5 cycloC5 neoC6 iC6 n-C6 iC7 methylcyclo
C6 and n-C7
C 1/(C 2+C3)




µL/L wet sediment


164-991A-





































1H-5

7.4

25

0.0

0.3

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

78

2H-2

12.1

110

0.0

1.7

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

64

3H-2

21.5

240

0.0

6.7

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

36

4H-2

31.1

420

0.0

13.8

0.5

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

29

5H-2

40.5

19,100

0.0

32.7

3.0

0.0

1.9

0.4

0.0

0.8

0.0

0.0

0.0

0.4

0.4

0.0

0.0

540

6H-3

51.5

26,900

0.0

38.7

4.7

0.3

3.2

0.4

0.1

0.9

0.0

0.0

0.0

0.6

0.4

0.0

0.0

620

164-992A-

































1H-2

2.5

18

0.0

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

140

2H-2

5.7

3

0.0

0.0

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

16

3H-2

15.2

10

0.0

0.1

0.2

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

36

4H-2

24.7

27

0.0

0.4

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

54

5H-4

37.3

140

0.1

2.8

0.2

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

46

6H-3

45.3

220

0.0

7.4

0.3

0.0

0.0

0.0

0.2

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

28

164-993A-

































1H-1

0.9

11

0.0

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

54

2X-2

4.8

4

0.0

0.3

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

14

3X-2

16.7

260

0.0

7.0

1.4

0.3

0.1

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

31

4X-2

25.9

20,100

0.0

45.8

2.8

0.0

2.5

0.3

0.5

0.4

0.0

0.0

0.0

0.5

0.3

0.4

0.0

410

5X-2

35.1

16,000

0.0

67.8

2.7

0.0

2.4

0.2

0.5

0.3

0.0

0.0

0.2

0.4

0.2

0.3

0.0

230

6X-2

45.1

14,300

0.0

74.9

2.7

0.0

2.8

0.2

0.6

0.3

0.0

0.0

0.2

0.4

0.0

0.0

0.0

190

164-996A-

































1H-6

3.6

13,900

0.0

8.5

1.9

0.0

0.9

0.3

0.0

1.8

0.0

0.0

0.0

0.0

0.0

0.0

0.0

1,330

3X-2

10.2

19,900

0.0

18.0

1.5

0.0

0.2

0.0

0.2

0.1

0.0

0.0

0.2

0.5

0.2

0.9

0.0

1,020

9H-3

70.4

38,400

0.0

28.7

6.8

0.0

7.4

3.3

0.3

18.5

1.4

0.3

0.5

4.2

4.0

1.5

0.3

1,080

Note: 0.0 = concentrations are below the detection limits of the method.

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