Table T18. Headspace analyses of interstitial and microbial gases, Site 1260.
Hole, core, section,
interval (cm)
Depth
(mbsf)
Routine safety monitoring
Microbial study
C1
(ppmv)
C2
(ppmv)
C3
(ppmv)
C1/C2
C1
(ppmv)
C2
(ppmv)
C3
(ppmv)
C1/C2
207-








Unit II:








1260A-2R-1, 145–150 2.45 2


8


1260A-3R-1, 145–150 11.75 2


4


1260A-4R-4, 0–5 24.00 3


5


1260A-5R-4, 0–5 33.30 4


4


1260A-6R-4, 0–5 42.70 4


23 0
55
1260A-7R-4, 0–5 52.00 3


5


1260A-8R-4, 0–5 61.70 4


6


1260A-9R-4, 0–5 71.40 4


23 0
47
1260A-10R-4, 0–5 81.10 4


7


1260A-11R-4, 0–5 90.80 5


7 0
29
1260A-12R-4, 0–5 100.40 5


6


1260A-13R-4, 0–5 110.10 3


13


1260A-14R-4, 0–5 119.80 7


20


1260A-15R-2, 0–5 126.40 3


8 1
13
1260A-16R-1, 3–5 134.53 2






1260A-17R-2, 0–5 145.70 4


5


1260A-18R-4, 0–5 158.00 3


5


1260A-19R-4, 0–5 167.70 3


5 1
6
1260A-20R-4, 0–5 177.30 3


5 0
11
1260A-21R-1, 129–130 183.79 2






1260A-23R-3, 0–5 204.40 3


4


1260A-24R-3, 137–139 215.27 4


3


1260A-25R-3, 0–2 223.70 4


4


1260A-26R-2, 148–150 233.28 3


4


1260A-27R-3, 148–150 244.48 3


2


1260A-28R-5, 0–2 254.86 3


4


1260A-29R-5, 98–100 265.48 4


5


1260A-30R-4, 0–2 273.32 17


19


Unit III:








1260A-31R-4, 0–5 282.58 133


260


1260A-32R-1, 145–150 289.65 236


451 1
609
1260A-33R-4, 0–5 302.26 569


776 1
872
1260A-34R-4, 0–5 311.90 1,414 1
1,088 1,432 2
930
1260A-35R-5, 0–5 323.10 1,455 1
1,119 1,226 1
943
1260A-36R-2, 0–5 328.20 2,246 2
1,248 2,208 2
1,110
1260A-37R-2, 0–5 337.90 2,741 2
1,371 2,047 2
1,329
1260B-24R-3, 0–2 341.40 1,125 1
1,293



1260A-38R-4, 0–5 350.50 1,258 1
968 3,872 3
1,237
1260B-25R-3, 145–150 352.45 1,508 1
1,371



1260A-39R-4, 0–5 360.10 747 1
1,493 682


1260B-26R-5, 0–5 363.70 481

1,203



1260A-40R-4, 0–5 369.80 1,291 1
1,435 2,507 2
1,441
1260B-27R-3, 0–5 370.30 600






1260B-28R-1, 149–150 378.39 1,091 1
1,213



1260A-41R-4, 0–5 379.40 3,511 3
1,351 2,392 2
1,367
1260B-29R-2, 0–1 383.00 1,880 2
1,106



1260A-42R-2, 0–5 386.00 4,014 3
1,434 2,105 1
1,537
1260B-30R-1, 145–150 387.95 1,067






Unit IV:








1260B-31R-1, 145–150 392.55 16,596 29
574



1260A-43R-2, 0–5 395.38 17,840 39
457 10,112 18
562
1260B-32R-2, 90–93 398.44 15,556 28
560



1260B-33R-1, 145–150 402.15 9,885 11
899



1260A-44R-2, 0–5 405.20 17,995 11
1,578 10,240 5
1,907
1260B-34R-3, 0–5 408.70 13,149 17
778



1260A-45R-1, 148–150 410.18 8,333 11
744 6,427 7
980
1260A-46R-4, 0–5 418.28 15,565 34
463 9,101 16
555
1260B-35R-3, 0–5 418.30 6,355 12
512



1260B-36R-3, 0–5 427.90 34,665 108 11 322



1260A-47R-5, 143–145 431.31 16,025 50 5 319 15,861 40 2 398
1260A-48R-3, 0–2 436.40 8,000 23 2 351 6,552 14
462
1260B-37R-5, 0–5 440.50 22,539 63 6 360



1260B-38R-2, 0–2 445.60 48,558 123 16 396



1260A-49R-4, 0–2 447.45 12,783 34 5 378 5,989 15
387
1260B-39R-2, 0–2 455.20 68,266 190 27 359



1260A-50R-5, 0–2 458.70 18,102 58 9 313 21,045 80 11 263
1260B-40R-2, 0–2 464.60 3,941 13
301



1260A-51R-5, 146–148 469.44 16,567 53 6 313 35,955 117 12 307
1260B-41R-2, 0–2 474.20 17,337 64 6 270



1260A-52R-4, 0–2 476.08 8,843 26
336 10,200 44 5 234
1260A-53R-1, 143–145 482.73 4,109 20
206
8

Unit V:








1260B-42R-2, 138–139 484.96 3,910 10
407



1260A-54R-1, 149–150 489.39 4,260 10
435 2,834
1
1260B-43R-2, 0–2 489.40 6,973 17
418



1260B-44R-2, 0–2 493.37 2,179 4
559



1260B-45R-1, 148–150 497.98 7,827 14
547



1260B-46R-2, 145–150 504.45 6,275 13
486



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