Methane-related authigenic carbonates of eastern Mediterranean Sea mud volcanoes and their possible relation to gas hydrate destabilisation

Aloisi, Giovanni; Cartigny, Pierre; Rouchy, Jean-Marie; Foucher, Jean-Paul; Woodside, John

doi:10.1016/s0012-821x(00)00322-8

Cited by 358 publications

(264 citation statements)

References 38 publications

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“…(Sibuet and Olu, 1998). Carbonate crusts (which can include calcite and dolomite) are also known to form in cold seep regions (Aloisi et al, 2000;Aloisi et al, 2002;Luff et al, 2004).…”

Section: Hydrothermal Vents and Cold Seepsmentioning

confidence: 99%

Laser Raman spectroscopy as a technique for identification of seafloor hydrothermal and cold seep minerals

2009

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“…(Sibuet and Olu, 1998). Carbonate crusts (which can include calcite and dolomite) are also known to form in cold seep regions (Aloisi et al, 2000;Aloisi et al, 2002;Luff et al, 2004).…”

Section: Hydrothermal Vents and Cold Seepsmentioning

confidence: 99%

Laser Raman spectroscopy as a technique for identification of seafloor hydrothermal and cold seep minerals

2009

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“…When rising methane reaches the upper parts of the sediment, it is oxidized, coupled with sulfate reduction in an anaerobic environment at the base of the sulfate reduction zone. This is known as the anaerobic oxidation of methane (AOM) [7][8][9]. AOM is mediated by methane oxidizing archaea (MOA) in conjunction with sulfate reducing bacteria (SRB).…”

mentioning

confidence: 99%

Glycerol ether biomarkers and their carbon isotopic compositions in a cold seep carbonate chimney from the Shenhu area, northern South China Sea

Jiang

Yang

et al. 2011

Chin. Sci. Bull.

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At modern cold seeps, the anaerobic oxidation of methane (AOM) is the dominant pathway for methane consumption in marine sediments. AOM, which is mediated by a consortium of methane oxidizing archaea and sulfate reducing bacteria, is proposed to be responsible for authigenic carbonate formation. A methane-derived carbonate chimney was collected from the Shenhu area, northern South China Sea. The membrane lipids and their very low carbon isotopic compositions (115‰ to 104‰) in the Shenhu chimney suggest the presence of an AOM process. Three specific archaeal and bacterial biomarkers were detected, including Ar, DAGE 1f, and monocyclic MDGD. Their strongly depleted   13 C values (115‰ to 104‰), which are lower than those of the normal marine lipids in sediments, reveal biogenic methane as their origin. The carbonate deposits exhibiting a chimney structure indicate that a vigorous methane-rich fluid expulsion may have occurred at the seafloor. We propose that the decomposition of gas hydrates at depth is the likely cause of seepage and cold seep carbonate formation in the Shenhu area.

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“…Under CALMAR A, the elevated RQ (0.97) could be the indicator of inorganic carbon dissolution due to the decrease of pH connected to the CO 2 production. Napoli mud volcano is characterized by extensive areas of authigenic carbonate crusts associated with methane emissions and induced by microbial anaerobic activity (Aloisi et al 2000). The area was also rich in shell debris.…”

Section: Discussionmentioning

confidence: 99%

A new CALMAR benthic chamber operating by submersible: First application in the cold‐seep environment of Napoli mud volcano (Mediterranean Sea)

Caprais

Lantéri

Crassous

et al. 2010

Limnology & Ocean Methods

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Ocean chemistry and marine biogeochemical cycles depend strongly on the exchanges at the deep-sea floor. Mineralization processes within sediments and the exchange of compounds across the sediment-water interface are, however, regulated by a balance between chemical and biological processes. Turnover between particulate and dissolved states is characteristic of bioactive element cycles, and this process is particularly rapid on the deep sea floor (Jahnke et al. 1989). The diffusive and advective transfer of chemical compounds across the sediment represents significant sources or sinks in oceanic budgets. The coupling between sediment and the water column interface have been done by several authors, and the aim of their studies was to calculate the rates of chemical exchanges (Smith Jr. et al. 1983;Patching et al. 1986;Jahnke et al. 1989;Pfannkuche 1993; Jahnke et al. 1994). Over the last 20 years, benthic landers have been developed to estimate these deep benthic exchanges. Two approaches are generally used. The first approach uses core-sampled sediments to extract interstitial waters or to measure with microprobe the chemical gradients, and then calculate advective-diffusive fluxes within the sediment. This approach has limitations because nutrient concentrations are difficult to measure with precision at fine scale and transport coefficients are rarely accurately determined. A possible re-equilibration of the system during its recovery can also affect the distribution of porewater components. The second approach uses in situ benthic chambers in which a known volume of seawater is placed in contact with the sediment and incubated. This approach directly measures the solute flux, and contrary to the other method, does not need calculation using model or coefficient. The incubation is made on a great sediment surface and the AbstractA new submersible-operated benthic chamber has been developed to measure benthic organism metabolism and chemical exchange rates at the sediment-water interface up to 6000 m depth. This equipment can be used everywhere on soft sediment, but particularly to deploy it on small area reached only by submersible-like cold seep. The chamber, 41 cm diameter cylinder, includes six 100 mL-sampling cells to isolate aliquots, which are sampled at predetermined intervals and an oxygen-optode probe. This chamber named CALMAR (Chambre Autonome Légère MAnipulable par ROV) was used for the first time during the Medeco cruise (2007) in Eastern Mediterranean Sea. It allowed measurement of fluxes of oxygen, dissolved inorganic carbon, and methane on the Napoli mud volcano site. Two benthic chambers were deployed with the ROV Victor, respectively, on small, active, cold seep colonized by Siboglinidae worms and mussels (Station A), and at about 3 m from the first where no visible animals were observed (Station B). The oxygen flux was 35 mmol O 2 m -2 d -1 in sediment colonized by large organisms (Station A) and 13.5 mmol O 2 m -2 d -1 on the inactive area (CALMAR B). In terms of inorganic carbon, the flu...

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Methane-related authigenic carbonates of eastern Mediterranean Sea mud volcanoes and their possible relation to gas hydrate destabilisation

Cited by 358 publications

References 38 publications

Laser Raman spectroscopy as a technique for identification of seafloor hydrothermal and cold seep minerals

Laser Raman spectroscopy as a technique for identification of seafloor hydrothermal and cold seep minerals

Glycerol ether biomarkers and their carbon isotopic compositions in a cold seep carbonate chimney from the Shenhu area, northern South China Sea

A new CALMAR benthic chamber operating by submersible: First application in the cold‐seep environment of Napoli mud volcano (Mediterranean Sea)

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