Table 3 Atmospheric equilibrium seawater contribution estimated from 20Ne/4He in surface sediments from submarine mud volcanoes off Tanegashima Island (A) and helium isotopic ratios ((3He/4He)corr) corrected for the atmospheric equilibrium seawater contribution, and mantle-derived and crust-derived helium contribution estimated from the corrected values (M and C, respectively).

From: Estimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off Tanegashima Island

Sample

A

(3He/4He )corr

Mantle

Crust

RA

%

%

MV1

0.058 ± 0.030

0.18 ± 0.17

2.0 ± 1.8

98.0 ± 1.8

MV2

0.068 ± 0.007

0.60 ± 0.10

7.3 ± 1.2

92.7 ± 1.2

MV3-1

0.014 ± 0.001

0.34 ± 0.05

4.0 ± 0.6

96.0 ± 0.6

MV3-2

0.069 ± 0.007

0.38 ± 0.06

4.5 ± 0.7

95.5 ± 0.7

MV3-3

0.310 ± 0.031

0.63 ± 0.10

7.6 ± 1.2

92.4 ± 1.2

MV14

0.209 ± 0.001

0.93 ± 0.02

11.5 ± 0.2

88.5 ± 0.2

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