Table T18. Headspace analyses of interstitial and microbial gases, Hole 1259A.
Core, section,
interval (cm)
Depth
(mbsf)
Routine safety monitoring
Microbial study
C1
(ppmv)
C2
(ppmv)
C3
(ppmv)
C1/C2
C1
(ppmv)
C2
(ppmv)
C2=
(ppmv)
C3
(ppmv)
C1/C2
207-1259A-









Unit I (foraminifer-bearing nannofossil ooze):






1R-2, 100–105 2.50 2


114



2R-2, 140–145 11.70 2


3



3R-4, 140–145 24.20 2


2



4R-1, 94–99 28.24 2







Unit II (foraminifer-bearing nannofossil chalk):






5R-2, 140–145 39.30 2


7



6R-2, 140–145 48.40 2


5



7R-4, 140–145 60.50 2


3



8R-4, 140–145 69.70 3


3



9R-5, 140–145 80.30 3


7



10R-5, 135–140 89.95 3


4



11R-4, 0–5 96.80 4


4



12R-5, 135–140 109.35 4


15



13R-4, 145–150 117.65 4


6



14R-3, 0–5 124.30 4


6



15R-3, 0–5 133.90 5


7



16R-2, 145–150 143.55 4


51 1

51
17R-1, 145–150 151.65 4


9 1

8
18R-2, 0–5 161.25 3


6 1

7
19R-1, 145–150 170.95 3


12 2

8
20R-3, 0–5 182.20 4


8



21R-2, 0–5 190.30 4


12 2

7
22R-3, 135–140 202.85 3


11 1

10
23R-3, 0–5 211.10 3


8 1

7
24R-1, 127–132 219.07 3


9 2

5
25R-2, 0–5 228.70 4


11 1

10
26R-4, 0–5 241.40 4


6



27R-5, 0–5 252.50 3


9 1

7
28R-2, 0–5 257.14 4


9 2

5
29R-4, 0–5 270.30 3


7 2

4
30R-2, 0–5 277.00 3


7 1

7
31R-2, 0–5 286.60 3







32R-2, 0–5 296.13 3







33R-5, 0–5 310.40 3


4



34R-5, 0–5 320.02 4


3



35R-4, 0–5 328.16 4


4



36R-5, 0–5 339.30 3


3



37R-6, 0–5 350.50 15







38R-3, 0–5 355.60 24


20



39R-3, 0–5 364.73 46


403 1

630
40R-2, 0–5 373.30 579

1447 421



41R-1, 27–28 381.67 248







Unit III (clayey nannofossil chalk):







43R-4, 0–5 405.20 1,484 1
1,484 1,837 2

1,141
44R-4, 0–5 414.90 2,134 2
1,255 1,162 1

1,056
45R-4, 0–5 423.90 2,660 2
1,330 2,263 2

1,067
46R-3, 145–150 433.36 2,235 2
1,490 2,902 2

1,262
48R-4, 0–5 453.30 1,586 1
1,442 1,819 2

1,083
49R-4, 139–144 464.12 2,854 2
1,427 756 1

922
50R-4, 132–137 473.64 1,159 1
1,449 2,238 2

1,264
51R-6, 0–5 485.07 3,368 2
1,604 2,852 3

1,064
Unit IV (black shales and sandstones):







52R-6, 0–5 493.60 6,602 10
681 7,173 10

701
53R-2, 145–150 499.95 24,936 46
544 8,237 21

395
54R-2, 0–5 508.10 7,218 14
505 16,108 27

603
55R-2, 91–96 512.96 37,762 65
581 23,401 34

686
56R-2, 140–145 518.56 9,530 19
491 7,454 12

626
57R-2, 0–5 521.80 12,900 20
662 23,878 26

920
58R-4, 0–2 533.81 62,252 101 5 615 40,330 66

616
59R-4, 129–130 545.12 76,398 91 4 844 56,416 51

1,109
Unit V (quartz sandstone):







60R-1, 9–13 549.19 2,308







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