Table T1. Concentration of C2-C6 hydrocarbon gases detected by purge-trap analysis in sediments, Site 1109.
Core, section, interval (cm) Depth (mbsf) Concentration (pmol/g dry sediment)
Ethane
Propane
Isobutane
Butane
Isobutylene + 1 butane
trans-
2-Butene
Isopentane
2-Methylpentane
3-Methylpentane
Hexane
180-1109B-










1H-1, 140-145 1.40 25 13
8 9


8 15
180-1109C-










10H-4, 145-150 89.35 41 28
3 4




18X-3, 145-150 164.55 54 67 2 7 56

17 15 42
26X-1, 110-115 238.10 8 2 1 1 10

42 52 142
40X-3, 145-150 366.65 27 2
5 37

93 98 165
18R-4, 90-95 517.42 78 34 3
35

71 137 202
34R-3, 93-98 660.74 36 6
3 149 12 12 276 285 716