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Pape, Thomas; Geprägs, Patrizia; Hammerschmidt, Sebastian; Wintersteller, Paul; Wei, Jiangong; Fleischmann, Timo; Bohrmann, Gerhard; Kopf, Achim J (2014): Hydrocarbon analyses of submarine mud volcanoes (MV) in the Kumano forearc basin. PANGAEA, https://doi.org/10.1594/PANGAEA.834466, Supplement to: Pape, T et al. (2014): Hydrocarbon seepage and its sources at mud volcanoes of the Kumano forearc basin, Nankai Trough subduction zone. Geochemistry, Geophysics, Geosystems, 15(6), 2180-2194, https://doi.org/10.1002/2013GC005057

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Abstract:
Twelve submarine mud volcanoes (MV) in the Kumano forearc basin within the Nankai Trough subduction zone were investigated for hydrocarbon origins and fluid dynamics. Gas hydrates diagnostic for methane concentrations exceeding solubilities were recovered from MVs 2, 4, 5, and 10. Molecular ratios (C1/C2<250) and stable carbon isotopic compositions (d13C-CH4 >-40 per mil V-PDB) indicate that hydrate-bound hydrocarbons (HCs) at MVs 2, 4, and 10 are derived from thermal cracking of organic matter. Considering thermal gradients at the nearby IODP Sites C0009 and C0002, the likely formation depth of such HCs ranges between 2300 and 4300 m below seafloor (mbsf). With respect to basin sediment thickness and the minimum distance to the top of the plate boundary thrust we propose that the majority of HCs fueling the MVs is derived from sediments of the Cretaceous to Tertiary Shimanto belt below Pliocene/Pleistocene to recent basin sediments. Considering their sizes and appearances hydrates are suggested to be relicts of higher MV activity in the past, although the sporadic presence of vesicomyid clams at MV 2 showed that fluid migration is sufficient to nourish chemosynthesis-based organisms in places. Distributions of dissolved methane at MVs 3, 4, 5, and 8 pointed at fluid supply through one or few MV conduits and effective methane oxidation in the immediate subsurface. The aged nature of the hydrates suggests that the major portion of methane immediately below the top of the methane-containing sediment interval is fueled by current hydrate dissolution rather than active migration from greater depth.
Coverage:
Median Latitude: 33.630598 * Median Longitude: 136.662273 * South-bound Latitude: 33.387860 * West-bound Longitude: 136.281330 * North-bound Latitude: 33.768630 * East-bound Longitude: 136.923480
Date/Time Start: 2012-06-14T21:14:00 * Date/Time End: 2012-07-14T03:44:00
Size:
31 datasets

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Datasets listed in this publication series

  1. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Auxiliary Material Table 1) Sample codes and positions of gravity cores taken at mud volcanoes (MV) in the Kumano forearc basin. https://doi.org/10.1594/PANGAEA.834590
  2. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water as well as δ¹³C-values of dissolved and hydrate-bound methane from sediment core GeoB16712-1. https://doi.org/10.1594/PANGAEA.836744
  3. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water as well as δ¹³C-values of dissolved and hydrate-bound methane from sediment core GeoB16716-2. https://doi.org/10.1594/PANGAEA.836745
  4. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water as well as δ¹³C-values of dissolved and hydrate-bound methane from sediment core GeoB16722-2. https://doi.org/10.1594/PANGAEA.836748
  5. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water as well as δ¹³C-values of dissolved and hydrate-bound methane from sediment core GeoB16725-1. https://doi.org/10.1594/PANGAEA.836750
  6. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water as well as δ¹³C-values of dissolved and hydrate-bound methane from sediment core GeoB16742-1. https://doi.org/10.1594/PANGAEA.836753
  7. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water as well as δ¹³C-values of dissolved and hydrate-bound methane from sediment core GeoB16746-1. https://doi.org/10.1594/PANGAEA.836754
  8. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water as well as δ¹³C-values of dissolved and hydrate-bound methane from sediment core GeoB16771-1. https://doi.org/10.1594/PANGAEA.836762
  9. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water as well as δ¹³C-values of dissolved and hydrate-bound methane from sediment core GeoB16772-1. https://doi.org/10.1594/PANGAEA.836763
  10. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16703-1. https://doi.org/10.1594/PANGAEA.836740
  11. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16704-1. https://doi.org/10.1594/PANGAEA.836741
  12. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16707-1. https://doi.org/10.1594/PANGAEA.836742
  13. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16708-1. https://doi.org/10.1594/PANGAEA.836743
  14. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16720-1. https://doi.org/10.1594/PANGAEA.836746
  15. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16721-1. https://doi.org/10.1594/PANGAEA.836747
  16. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16723-5. https://doi.org/10.1594/PANGAEA.836749
  17. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16726-8. https://doi.org/10.1594/PANGAEA.836751
  18. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16735-1. https://doi.org/10.1594/PANGAEA.836752
  19. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16747-5. https://doi.org/10.1594/PANGAEA.836755
  20. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16748-1. https://doi.org/10.1594/PANGAEA.836756
  21. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16754-2. https://doi.org/10.1594/PANGAEA.836757
  22. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16756-1. https://doi.org/10.1594/PANGAEA.836758
  23. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16757-1. https://doi.org/10.1594/PANGAEA.836759
  24. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16759-3. https://doi.org/10.1594/PANGAEA.836760
  25. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16764-1. https://doi.org/10.1594/PANGAEA.836761
  26. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16780-1. https://doi.org/10.1594/PANGAEA.836764
  27. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16781-1. https://doi.org/10.1594/PANGAEA.836765
  28. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16782-2. https://doi.org/10.1594/PANGAEA.836766
  29. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Figure 3) Concentration profile of methane dissolved in pore water from sediment core GeoB16785-2. https://doi.org/10.1594/PANGAEA.836767
  30. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Table 1) Distributions of light hydrocarbons and CO2, C1/C2 ratios, and stable C isotope signatures of CH4 in hydrate-bound gas and dissolved gas. https://doi.org/10.1594/PANGAEA.834461
  31. Pape, T; Geprägs, P; Hammerschmidt, S et al. (2014): (Table 2) Depths of the SMI and gas hydrate occurrences at individual MVs. https://doi.org/10.1594/PANGAEA.834464