Table 1 Comparisons of the contents and carbon isotope ratios of TOC and FeR-OC between non-SMTZ and SMTZ sediments in two cores

From: Cycling and persistence of iron-bound organic carbon in subseafloor sediments

 QDN-G1

TOC (%)

FeR-OC (%)

fFeR-OC (%)

δ13CTOC (‰, VPDB)

δ13CFeR-OC (‰, VPDB)

Non-SMTZa (n = 21)

0.8 ± 0.2

0.12 ± 0.03

14.0 ± 1.9

−20.6 ± 0.7

−21.8 ± 1.8

SMTZa (n = 7)

0.5 ± 0.0

0.06 ± 0.02

12.3 ± 2.8

−22.2 ± 0.2

−24.8 ± 3.0

Offset between non-SMTZ and SMTZ sedimentsb

0.3

0.06

1.8

1.5

3.1

P value

P = 3.1e−04

P = 3.1e−04

P = 0.1

P = 3.1e−04

P = 9.5e−04

QDN-14B

TOC (%)

FeR-OC (%)

fFeR-OCc (%)

δ13CTOC (‰, VPDB)

δ13CFeR-OC (‰, VPDB)

Non-SMTZa (n = 29)

0.8 ± 0.1

0.10 ± 0.02

13.0 ± 4.0

−21.5 ± 0.7

−20.8 ± 1.4

SMTZa(n = 7)

0.6 ± 0.3

0.03 ± 0.01

5.2 ± 1.8c

−23.3 ± 1.3

−23.5 ± 1.1

Offset between non-SMTZ and SMTZ sedimentsb

0.2

0.07

7.7

1.9

2.8

P value

P = 0.2

P = 4.8e−07

P = 5e−05

P = 1.6e−05

P = 7.1e−06

  1. P values of the two-sided Wilcoxon rank sum test are shown. See Supplementary Fig. 5 for data visualized in box plots.
  2. aGiven are means±standard deviation.
  3. bOffsets of corresponding averaged values between non-SMTZ and SMTZ sediments.
  4. cfFeR-OC data at 410 and 420 cmbsf in QDN-14B are biased by extremely low TOC and are not included for calculations (n = 5).
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