Table T2. Carbon isotopic composition of interstitial methane and CO2 gas at Leg 172 sites.
| Core, section |
Depth (mbsf) |
Depth (mcd) |
 13C
CH4( 
PDB) |
13C
CO2 gas (
PDB) |
|---|---|---|---|---|
172-1054A- |
||||
6H-5 |
52.51 |
54.36 |
-- |
-- |
10H-6 |
84.16 |
85.91 |
-72.23 |
-- |
11X-3 |
89.16 |
91.21 |
-72 |
-- |
13X-5 |
110.36 |
116.35 |
-69.21 |
-- |
14X-5 |
119.22 |
125.21 |
-68.28 |
0.9 |
16X-6 |
140.76 |
146.75 |
-66.49 |
0.1 |
18X-2 |
154.06 |
160.05 |
-67.83 |
2.3 |
20X-2 |
173.36 |
179.35 |
-67.41 |
3.8 |
22X-5 |
197.16 |
203.15 |
-65.75 |
2.0 |
172-1055B- |
||||
8H-1 |
61.50 |
69.31 |
-79.95 |
-- |
9H-1 |
71.00 |
79.51 |
-78.5 |
-- |
11H-2 |
90.00 |
102.07 |
-77.83 |
-3.42 |
13H-3 |
109.00 |
124.60 |
-72.54 |
-- |
172-1058A- |
||||
8H-1 |
67.60 |
74.29 |
-80.15 |
-- |
9H-1 |
76.43 |
84.10 |
-79.03 |
-- |
11H-2 |
97.00 |
106.78 |
-76.02 |
-- |
12H-3 |
107.58 |
119.67 |
-74.78 |
-- |
13H-3 |
117.56 |
130.93 |
-73.46 |
-- |
15H-3 |
136.15 |
152.42 |
-72.68 |
-- |
172-1059A- |
||||
2H-5* |
11.25 |
13.32 |
-100.6 |
-30.53 |
2H-6* |
12.75 |
14.82 |
-98.2 |
-26.19 |
3H-1* |
14.75 |
17.30 |
-97.14 |
-22.64 |
3H-2* |
16.25 |
18.80 |
-96.16 |
-19.17 |
3H-3* |
17.75 |
20.30 |
-95.27 |
-21.66 |
3H-4* |
19.25 |
21.80 |
-93.62 |
-20.54 |
6H-1 |
42.47 |
52.47 |
-85.76 |
-- |
172-1060A- |
||||
8H-2 |
67.57 |
79.64 |
-84.99 |
-- |
11H-1 |
95.98 |
111.17 |
-77.38 |
-- |
14H-3 |
126.82 |
147.45 |
-80.58 |
-- |
16H-5 |
145.58 |
169.44 |
-79.11 |
-- |
18H-4 |
166.65 |
187.28 |
-77.68 |
-- |
172-1061A- |
||||
6H-1 |
48.91 |
68.26 |
-88.3 |
-4.4 |
9H-1 |
77.03 |
102.08 |
-85.56 |
-- |
13H-3 |
117.15 |
146.49 |
-83.62 |
-- |
16H-5 |
147.44 |
182.56 |
-79.22 |
-- |
20X-4 |
182.07 |
221.34 |
-76.97 |
-- |
24X-4 |
220.91 |
260.18 |
-76.15 |
-- |
30X-4 |
277.67 |
316.94 |
-75.52 |
-- |
34X-2 |
313.68 |
352.95 |
-74.2 |
-- |
37X-1 |
341.07 |
380.34 |
-73.56 |
-- |
172-1062A- |
||||
16H-1 |
136.28 |
145.30 |
-85.08 |
-- |
18H-3 |
157.27 |
169.21 |
-83.18 |
-- |
21X-4 |
187.08 |
196.04 |
-79.42 |
-- |
172-1063A- |
||||
12H-1 |
100.66 |
107.66 |
-91.38 |
-- |
16H-1 |
139.25 |
150.53 |
-87.36 |
-- |
20H-1 |
177.48 |
190.53 |
-84.81 |
-- |
24X-2 |
209.69 |
228.92 |
-82.07 |
-- |
28X-3 |
250.18 |
273.63 |
-82.52 |
-- |
32X-2 |
291.46 |
315.48 |
-82.02 |
-- |
34X-6 |
312.11 |
339.28 |
-79.53 |
-- |
38X-1 |
341.92 |
373.81 |
-81.6 |
-- |
45X-6 |
416.32 |
448.21 |
-82.81 |
-- |
Notes: mbsf = meters below seafloor, mcd = meters
corrected depth. Isotopic values in per mil ()
relative to the Peedee belemnite (PDB) standard. * =
Reeburgh squeezer samples.