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Ertefai, Tobias F; Heuer, Verena B; Prieto-Mollar, Xavier; Vogt, Christoph; Sylva, Sean P; Seewald, Jeffrey S; Hinrichs, Kai-Uwe (2010): (Appendix 1-4) Geochemistry, desorption methods, TOC, TC, and mineral content of different settings. PANGAEA,, Supplement to: Ertefai, TF et al. (2010): The biogeochemistry of sorbed methane in marine sediments. Geochimica et Cosmochimica Acta, 74, 6033-6048,

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Sorption of volatile hydrocarbon gases (VHCs) to marine sediments is a recognized phenomenon that has been investigated in the context of petroleum exploration. However, little is known about the biogeochemistry of sorbed methane and higher VHCs in environments that are not influenced by thermogenic processes. This study evaluated two different extraction protocols for sorbed VHCs, used high pressure equipment to investigate the sorption of methane to pure clay mineral phases, and conducted a geochemical and mineralogical survey of sediment samples from different oceanographic settings and geochemical regimes that are not significantly influenced by thermogenic gas. Extraction of sediments under alkaline conditions yielded higher concentrations of sorbed methane than the established protocol for acidic extraction. Application of alkaline extraction in the environmental survey revealed the presence of substantial amounts of sorbed methane in 374 out of 411 samples (91%). Particularly high amounts, up to 2.1 mmol kg**-1 dry sediment, were recovered from methanogenic sediments. Carbon isotopic compositions of sorbed methane suggested substantial contributions from biogenic sources, both in sulfate-depleted and sulfate-reducing sediments. Carbon isotopic relationships between sorbed and dissolved methane indicate a coupling of the two pools. While our sorption experiments and extraction conditions point to an important role for clay minerals as sorbents, mineralogical analyses of marine sediments suggest that variations in mineral composition are not controlling variations in quantities of sorbed methane. We conclude that the distribution of sorbed methane in sediments is strongly influenced by in situ production.
Related to:
Ertefai, Tobias F (2009): The biogeochemical significance of gaseous hydrocarbons sorbed to marine sediments (Die biogeochemische Signifikanz von sorbierten Kohlenwasserstoffgasen in marinen Sedimenten). PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000114192
Median Latitude: 37.748656 * Median Longitude: 109.519359 * South-bound Latitude: -12.020510 * West-bound Longitude: 14.726600 * North-bound Latitude: 72.005700 * East-bound Longitude: -81.903980
Date/Time Start: 2002-03-22T15:00:00 * Date/Time End: 2007-10-22T09:30:00
201-1231E * Latitude: -12.020510 * Longitude: -81.903980 * Date/Time: 2002-03-22T15:00:00 * Elevation: -4812.5 m * Penetration: 119.1 m * Recovery: 118.57 m * Location: South Pacific Ocean * Campaign: Leg201 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 14 cores; 119.1 m cored; 0 m drilled; 99.6 % recovery
301-U1301C * Latitude: 47.754660 * Longitude: -127.763330 * Elevation: -2656.0 m * Recovery: 143.36 m * Location: Juan de Fuca Ridge, North Pacific Ocean * Campaign: Exp301 (Juan de Fuca Hydrogeology) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 166.8 m cored; 85.9 % recovered; 98.5 m drilled; 265.3 m penetrated
311-U1326D * Latitude: 48.627133 * Longitude: -127.000845 * Elevation: -1827.9 m * Recovery: 121.96 m * Campaign: Exp311 (Cascadia Margin Gas Hydrates) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 192.6 m cored; 63.3 % recovered; 107.4 m drilled; 300 m penetrated
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