Consulta: subjectFacets:"Seeps"
Registros recuperados: 3
Data/hora: 09/06/2024 12:30:18

Basin-wide estimates of the input of methane from seeps and clathrates to the Black Sea
Provedor de dados: 5
Autores: Kessler, Jd; Reeburgh, Ws; Southon, J; Seifert, R; Michaelis, W; Tyler, Sc.
Numerous methane-emitting bottom features, such as seeps, methane clathrate hydrates (clathrates), and mud volcanoes, have been identified recently in the Black Sea. The fluxes of methane from these sources averaged over large spatial scales are unknown. Here we take advantage of the fact that the Black Sea is a semi-enclosed basin with restricted deep water circulation to establish first-order estimates of basin-wide fluxes of methane from these sources to the water column and atmosphere. First, we measured tile natural radiocarbon content of methane (C-14-CH4) dissolved in the water column and emitted from seeps. The C-14-CH4 results showed that the dominant source of methane to the water column is emitted from seeps and a smaller source is...
Tipo: Text
Palavras-chave: Methane; Seeps; Methane clathrate hydrates; Black Sea; Methane radiocarbon; Seep methane flux.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00209/31994/30436.pdf

Deep-sea ophiuroids (Echinodermata) from reducing and non-reducing environments in the North Atlantic Ocean
Provedor de dados: 5
Autores: Stohr, Sabine; Segonzac, Michel.
The animal communities associated with the deep-sea reducing environment have been studied for almost 30 years, but until now only a single species of ophiuroid, Ophioctenella acies, has been found at both hydrothermal vents and methane cold seeps. Since the faunal overlap between vent and seep communities is small and many endemic species have been found among other taxa (e.g. Mollusca, Crustacea), additional species of ophiuroids were expected at previously unstudied sites. Chemical compositions at reducing sites differ greatly from the nearby bathyal environment. Generally, species adapted to chemosynthetic environments are not found in non-chemosynthetic habitats, but occasional visitors of other bathyal species to vent and seep sites have been...
Tipo: Text
Palavras-chave: Habitat description; Distribution record; Seeps; Methane; Hydrothermal vents; Ophiuroids.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-427.pdf

Multiple gas reservoirs are responsible for the gas emissions along the Marmara fault network
Provedor de dados: 5
Autores: Ruffine, Livio; Donval, Jean-pierre; Croguennec, Claire; Burnard, Pete; Lu, Hailong; Germain, Yoan; Legoix, Ludovic N.; Bignon, Laurent; Cagatay, M. Namik; Marty, Bernard; Madre, David; Pitel-roudaut, Mathilde; Henry, Pierre; Geli, Louis.
On continental margins, upward migration of fluids from various sources and various subsurface accumulations, through the sedimentary column to the seafloor, leads to the development of cold seeps where chemical compounds are discharged into the water column. MarsiteCruise was undertaken in November 2014 to investigate the dynamics of cold seeps characterized by vigorous gas emissions in the Sea of Marmara (SoM). A previous paper published by Bourry et al. (2009) presented the gas geochemistry of three seeps sampled along three different segments in the SoM. Their findings showed that the seeps were sourced by three different reservoirs. In this paper, seventeen seeps were investigated to determine the gas sources, unravel reservoir contributions, and...
Tipo: Text
Palavras-chave: Abiotic CO2-source; Gas bubbles; Molecular and isotopic compositions; Primary and secondary methanogenesis; Sea of Marmara; Seeps; Thermogenic gases.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00411/52203/52926.pdf