Gas seepage from a carbonate-cemented sandstone reef on the Kattegat coast of Denmark

Dando, P. R.; Ohara, Susumu; Schuster, Ute; Taylor, L.J.; Clayton, Chris; Baylis, S.A.; Laier, Troels

doi:10.1016/0264-8172(94)90094-9

Cited by 32 publications

(17 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been documented that pressure gradients at the sediment-water interface are driving forces for porewater advection, which rapidly transport fluids and particles into layers much deeper and faster compared to diffusive transport (Precht et al, 2004;Huettel et al, 1998;Ziebis et al, 1996). When combined with gas venting, as it occurs in the Brian Seep area, convection of porewater can be induced (Dando et al, 1994a;O'Hara et al, 1995). The rising gas is entraining porewater from the surrounding sediment, leading to a fast removal of reduced compounds.…”

Section: Discussionmentioning

confidence: 99%

“…The deeper penetration could be explained by advective transport processes through permeable sand (e.g., Huettel and Gust, 1992;Huettel et al, 1998). Alternatively, it might indicate recharge processes for the convective pore water transport, which is induced by the gas and fluid venting (Dando et al, 1994a). Deep oxygen penetration offers a niche for aerobic methanotrophs in the surface sediments of Brian Seep.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Methane oxidation in permeable sediments at hydrocarbon seeps in the Santa Barbara Channel, California

Treude

Ziebis

2010

Biogeosciences

View full text Add to dashboard Cite

Abstract.A shallow-water area in the Santa Barbara Channel, California, known collectively as the Coal Oil Point seep field, is one of the largest natural submarine hydrocarbon emission areas in the world. Both gas and oil are seeping constantly through a predominantly sandy seabed into the ocean. This study focused on the methanotrophic activity within the surface sediments (0-15 cm) of the permeable seabed in the so-called Brian Seep area at a water depth of ∼10 m. Detailed investigations of the sediment biogeochemistry of active gas vents indicated that it is driven by fast advective transport of water through the sands, resulting in a deep penetration of oxidants (oxygen, sulfate). Maxima of microbial methane consumption were found at the sediment-water interface and in deeper layers of the sediment, representing either aerobic or anaerobic oxidation of methane, respectively. Methane consumption was relatively low (0.6-8.7 mmol m −2 d −1 ) in comparison to gas hydratebearing fine-grained sediments on the continental shelf. The low rates and the observation of free gas migrating through permeable coastal sediments indicate that a substantial proportion of methane can escape the microbial methane filter in coastal sediments.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Methane oxidation in permeable sediments at hydrocarbon seeps in the Santa Barbara Channel, California

Treude

Ziebis

2010

Biogeosciences

View full text Add to dashboard Cite

show abstract

“…Under anoxic conditions, the final step of decomposition of organic matter leads to the generation of methane within the sediment. In the Baltic Sea, pore-water as well as acoustic investigations demonstrated that methane is abundant in high concentrations within the sediment and that in some regions methane is also released as free or dissolved gas into the water column (Dando et al, 1994;Piker et al, 1998;Thießen et al, 2006). Extensive water column investigations in the Baltic Sea identified the strongest methane enrichment within the stagnant anoxic water bodies of the deep basins (Gotland Deep and Landsort Deep; max.…”

Section: O Schmale Et Al: Aerobic Methanotrophy Within the Pelagic mentioning

confidence: 99%

Aerobic methanotrophy within the pelagic redox-zone of the Gotland Deep (central Baltic Sea)

Schmale

Blumenberg²,

Kießlich

et al. 2012

Biogeosciences

View full text Add to dashboard Cite

Abstract. Water column samples taken in summer 2008 from the stratified Gotland Deep (central Baltic Sea) showed a strong gradient in dissolved methane concentrations from high values in the saline deep water (max. 504 nM) to low concentrations in the less dense, brackish surface water (about 4 nM). The steep methane-gradient (between 115 and 135 m water depth) within the redox-zone, which separates the anoxic deep part from the oxygenated surface water (oxygen concentration 0-0.8 mL L −1 ), implies a methane consumption rate of 0.28 nM d −1 . The process of microbial methane oxidation within this zone was evident by a shift of the stable carbon isotope ratio of methane between the bottom water (δ 13 C CH 4 = −82.4 ‰) and the redoxzone (δ 13 C CH 4 = −38.7 ‰). Water column samples between 80 and 119 m were studied to identify the microorganisms responsible for the methane turnover in that depth interval. Notably, methane monooxygenase gene expression analyses for water depths covering the whole redox-zone demonstrated that accordant methanotrophic activity was probably due to only one phylotype of the aerobic type I methanotrophic bacteria. An imprint of these organisms on the particular organic matter was revealed by distinctive lipid biomarkers showing bacteriohopanepolyols and lipid fatty acids characteristic for aerobic type I methanotrophs (e.g., 35-aminobacteriohopane-30,31,32,33,34-pentol), corroborating their role in aerobic methane oxidation in the redox-zone of the central Baltic Sea.

show abstract

“…3 to 6). Our initial impression, that the gas in the sediment was methane escaping from the interglacial and early Weischelian deposits (Dando et al 1993a), was not supported by the methane profiles in the sediment (Fig. 3) or by analysis of the gas.…”

Section: Sediment Chemistrymentioning

confidence: 87%

“…Along this beach methane seeps to the surface in places from the deep reservoirs below this part of the Kattegat (Jensen et al 1992, Dando et al 1993a). We initially believed that the quicksand was due to the saturation of the sand with methane seeping from these underlying reservoirs; however, examination of sediment cores from the quicksand showed that the gas originated in a layer of decomposing algae buried a few cm below the sediment surface.…”

Section: Introductionmentioning

confidence: 99%

Ecology of gassy, organic-rich sediment in a shallow subtidal area on the Kattegat coast of Denmark

Dando¹,

Fenchel²,

Jensen³

et al. 1993

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Mats of algae are frequently washed inshore along the sandy beaches in the Kattegat after storms and subsequently buried by sand deposition. Sediment cores were taken in May 1991 from one such shallow subtidal area, from which gas bubbles were being released. The organic-rich layer was less than 4 cm thick; it had extremely high sulphate reduction rates, up to 1.7 mm01 sulphate reduced dm-3 d-'; high hydrogen, up to 100 pm01 dm-3; methane, up to 54 pm01 dm'3; and hydrogen sulphide in excess of 1 mM. No macrofauna were found in this quicksand area and most of the meiofauna were confined to the uppermost 2 cm. The only metazoan to occur below the 6 cm zone, and down to a depth of at least 34 cm, was the nematode Sabatieria longispinosa. The anaerobic ciliate Trimyema sp. cf. marinum and the anaerobic flagellate Hexamita sp. dom~nated the highly reducing, organic-rich zone at 2 to 6 cm depth; they also occurred below this zone together with a few specimens of Euplotes sp.

show abstract

Gas seepage from a carbonate-cemented sandstone reef on the Kattegat coast of Denmark

Cited by 32 publications

References 15 publications

Methane oxidation in permeable sediments at hydrocarbon seeps in the Santa Barbara Channel, California

Methane oxidation in permeable sediments at hydrocarbon seeps in the Santa Barbara Channel, California

Aerobic methanotrophy within the pelagic redox-zone of the Gotland Deep (central Baltic Sea)

Ecology of gassy, organic-rich sediment in a shallow subtidal area on the Kattegat coast of Denmark

Contact Info

Product

Resources

About