Table 1.
Geochemical description of sediment samples from Sites E26, E29, and E44
| Core ID | Site E26 | Site E29 | Site E44 |
|---|---|---|---|
| Latitude (N) | 26.59 | 27.43 | 26.28 |
| Longitude (W) | 87.51 | 86.01 | 86.81 |
| Water depth (km) | 2.8 | 3.2 | 3.0 |
| TSF Max | 57,326.7 | 26,738.3 | 13,502.3 |
| UCM (μg g−1) | 32 | 13 | 7.3 |
| Σn-Alkanes (ng g−1) | 2845.3 | 2527 | 1045 |
| T/D ratio | 1.0 | 2.6 | 0.8 |
| ΣAlkane gas (ppm) | 9 | 36,012 | 9.9 |
| C2+ Alkanes (ppm) | 0.3 | 17.5 | 0.5 |
| C1/(C2 + C3) | NA | 3974.2 | NA |
| δ13CH4 (‰, vs. PDB)a | NA | −85.1 | NA |
TSF Max total scanning fluorescence maximum intensity. UCM unresolved complex mixture. Σn-Alkanes sum of C15−C34 n-alkanes. ΣAlkane Gas total alkane gases. C2+ Alkanes sum of alkane gases larger than methane. T/D thermogenic/diagenetic n-alkane
a The δ13CH4 values in Sites E26 and E29 could not be determined due to low methane concentration, which can be approximated by subtracting C2+ Alkanes from ΣAlkane Gas