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a
b
c
CH
4
(µmol/kg)
10
-
1
CO
2
(mmol/kg)
H
2
(µmol/kg)
10
1
10
3
10
5
10
2
10
3
0
20
40 0
1
10
0
0
0
1
1
1
2
2
2
3
3
3
4
4
4
d
e
f
δ
13
C
CH4
(‰)
-
120
δ
13
C
CO2
(‰)
-
60
-
40
δ
D
H2
(‰)
-
80
-
40
-
20
0
-
760
-
750
-
740
0
0
0
1
1
1
2
2
2
3
3
3
4
4
4
g
(
3
He/
4
He)
corr
(R
atm
)
0.1
0
0.2
0
1
2
3
4
Fig. 4
Chemical and isotopic compositions of dissolved gases in pore water from Oomine Ridge.
Open symbols
denote water samples and
solid symbols
denote gas samples
Fig. 5
Plot of
3
He/
4
He and
4
He/
20
Ne ratios of gas
samples from Oomine Ridge
of this study (
dots
) and those
of Nankai Trough (
crosses
)
from Sano and Wakita
(
1987
).
Dashed lines
are
mixing lines between mantle-
derived He and air-saturated
seawater at 0°C (ASW) and
between crustal radiogenic
He and ASW
10
Mantle
ASW
1
0.1
Crust
0.01
0.1
1
10
100
1000
4
He/
20
Ne
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