Pape, Thomas; Feseker, Tomas; Kasten, Sabine; Fischer, David; Bohrmann, Gerhard (2011): Gas hydrates of nonpressurized (GC) and pressurized (DAPC) sediment cores from the Hakon Mosby Mud Volcano, SW Barents Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.770365, Supplement to: Pape, T et al. (2011): Distribution and abundance of gas hydrates in near-surface deposits of the Håkon Mosby Mud Volcano, SW Barents Sea. Geochemistry, Geophysics, Geosystems, 12(9), Q09009, 21 PP., https://doi.org/10.1029/2011GC003575
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The occurrence of gas hydrates at submarine mud volcanoes (MVs) located within the gas hydrate stability zone (GHSZ) is controlled by upward fluid and heat flux associated with MV activity. Determining the spatial distribution of gas hydrates at MVs is crucial to evaluate their sensitivity to known episodic changes in volcanic activity. We determined the hydrocarbon inventory and spatial distribution of hydrates at an individual MV structure. The Håkon Mosby Mud Volcano (HMMV), located at 1,250 m water depth on the Barents Sea slope, was investigated by combined pressure core sampling, heat flow measurements, and pore water chemical analysis. Quantitative pressure core degassing revealed gas-sediment ratios between 3.1 and 25.7, corresponding to hydrate concentrations of up to 21.3% of the pore volume. Hydrocarbon compositions and physicochemical conditions imply that gas hydrates incipiently crystallize as structure I hydrate, with a dissociation temperature of around 13.8°C at this water depth. Based on numerous in situ measurements of the geothermal gradient in the seabed, pore water sulfate profiles and microbathymetric data, we show that the thickness of the GHSZ increases from less than 1 m at the warm center to around 47 m in the outer parts of the HMMV. We estimate the total mass of hydrate-bound methane stored at the HMMV to be about 102.5 kt, of which 2.8 kt are located within the morphological Unit I around the center and thus are likely to be dissociated in the course of a large eruption.
Median Latitude: 72.005605 * Median Longitude: 14.725499 * South-bound Latitude: 72.002400 * West-bound Longitude: 14.712300 * North-bound Latitude: 72.008000 * East-bound Longitude: 14.735000
Date/Time Start: 2007-06-25T19:30:00 * Date/Time End: 2007-07-05T21:49:00
PS70/053-1 * Latitude: 72.006300 * Longitude: 14.733900 * Date/Time: 2007-06-25T19:30:00 * Elevation: -1294.0 m * Location: Norwegian Sea * Campaign: ARK-XXII/1b (PS70) * Basis: Polarstern * Method/Device: Piston corer (PC)
PS70/054-1 * Latitude: 72.006200 * Longitude: 14.735000 * Date/Time: 2007-06-25T21:17:00 * Elevation: -1292.0 m * Location: Norwegian Sea * Campaign: ARK-XXII/1b (PS70) * Basis: Polarstern * Method/Device: Gravity corer (GC)
Datasets listed in this publication series
- Pape, T; Feseker, T; Kasten, S et al. (2011): (Table 1) Station characteristics of nonpressurized (GC) and pressurized (DAPC) sediment cores recovered from the Hakon Mosby Mud Volcano during ARK-XXII/1b in summer 2007. https://doi.org/10.1594/PANGAEA.770349
- Pape, T; Feseker, T; Kasten, S et al. (2011): (Table 2) General characteristics of pressure cores taken during ARK-XXII/1b at the Hakon Mosby Mud Volcano. https://doi.org/10.1594/PANGAEA.770351
- Pape, T; Feseker, T; Kasten, S et al. (2011): (Table 3) Distribution of C1 through n-C4 hydrocarbons in gas released from decomposing gas hydrates and during controlled degassing of pressure cores. https://doi.org/10.1594/PANGAEA.770362
- Pape, T; Feseker, T; Kasten, S et al. (2011): (Table 5) Gas and gas hydrate contents in pressurized cores taken from the Hakon Mosby Mud Volcano during ARK-XXII/1b. https://doi.org/10.1594/PANGAEA.770364
- Pape, T; Feseker, T; Kasten, S et al. (2011): (Table 6) Gas hydrate-related details of unit I and unit II deposits at the Hakon Mosby Mud Volcano. https://doi.org/10.1594/PANGAEA.770382