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Table T2. Results of methanogenic enrichment cultures by substrate after 12 months of incubation time, Expedition 347.

Core, section,
interval (cm)
No substrate
Acetate
H2/CO2
Methanol
TMA
Palmitate
Betaine
Phytane
Pristane
347-M0059C-
3H-2, 40–45 (+)
6H-1, 95–100 (+)
9H-1, 95–100 (+) +
12H-2, 65–70 (+)
15H-1, 100–105 (+) (+) +
24H-2, 65–70
347-M0059E-
4H-2, 55–60
7H-2, 115–120
10H-2, 140–145
13H-2, 125–130 + + ++ ++ + + + + +
16H-2, 90–95
25H-2, 105–110 +
347-M0060B-
6H-2, 75–80
9H-2, 55–60
12H-2, 50–55
15H-2, 45–50
23H-2, 20–25
24H-2, 50–55
28H-2, 110–115
347-M0063E-
3H-2, 60–65 + + ++ (+) ++ +
6H-2, 50–55 (+) +
9H-2, 45–50
12H-2, 62–67 + + ++ ++ + + + + +
15H-2, 45–50
18H-2, 25–30
21H-2, 25–30 (+) + (+) (+) (+)
32H-2, 90–95
42H-2, 120–125
347-M0065C-
4H-2, 60–65
7H-2, 65–70
10H-2, 60–65
12H-2, 110–115

TMA = trimethylamine. (+) = CH4 production only slightly higher than in controls, + = CH4 formation substantially higher than in controls, ++ = strong and long-lasting CH4 formation activity, — = no CH4 formation.

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