Consulta: subjectFacets:"Mud volcano"
Registros recuperados: 11
Data/hora: 09/06/2024 15:46:50

Sediment damage caused by gas exsolution: a key mechanism for mud volcano formation
Provedor de dados: 5
Autores: Blouin, Arthur; Sultan, Nabil; Callot, Jean-paul; Imbert, Patrice.
Gassy sediments are common in marine environments and are characterized by a specific mechanical behavior significantly different from that of water-saturated sediments. It is shown that gas causes damage and initiates fractures in sediments. To define the controlling parameters dominating the damage process during gas exsolution and its consequences in terms of hydro-mechanical behavior, we developed a specific consolidation apparatus to test sediments collected from the active Absheron Mud Volcano. Indeed, mud volcano formation is initiated by gas exsolution and subsequent mud generation at depth from stratified sediments. Gas was generated in the samples by circulating carbonated water through the fine-grained sediments, then decreasing the total...
Tipo: Text
Palavras-chave: Consolidation testing; Gas exsolution; Gassy sediments; Sediment damage; Mud volcano.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00588/70043/67974.pdf

Evolution model for the Absheron mud volcano: from in-situ observations to numerical modeling
Provedor de dados: 5
Autores: Blouin, Arthur; Imbert, Patrice; Sultan, Nabil; Callot, Jean-paul.
The morphology of mud volcanoes (MV) has been extensively studied over the last few decades. Although recent research has begun to focus on deep processes and structures, little is known about mud generation mechanisms. This study aims to investigate the feeder system and formation of an active kilometer‐scale MV by relying on a 3‐D seismic survey and an in‐situ dataset on the Absheron anticline (South Caspian Basin). Seismic data show a depleted area in the Anhydritic Surakhany Formation (ASF), whose mineralogical composition fits with surface mud. Well data show that the ASF is a succession of evaporitic beds and low temperature shales near its fracture pressure. Biostratigraphic analysis confirms a Pliocene origin for the mud, suggesting that the ASF...
Tipo: Text
Palavras-chave: Mud volcano; Pore pressure; Methane; Modeling; Seismic.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00481/59304/62057.pdf

Menes caldera, a highly active site of brine seepage in the Eastern Mediterranean sea: "In situ" observations from the NAUTINIL expedition (2003)
Provedor de dados: 5
Autores: Huguen, Caroline; Foucher, Jean-paul; Mascle, J.; Ondreas, Helene; Thouement, M.; Gontharet, S.; Stadnitskaia, A.; Pierre, C.; Bayon, Germain; Loncke, L.; Boetius, A.; Bouloubassi, I.; De Lange, G.; Caprais, Jean-claude; Fouquet, Yves; Woodside, J.; Dupre, Stephanie.
This paper reports the first "in situ" seafloor observations of fluid escape structures in a fault-controlled caldera-type depression of about 8 km diameter, named the Menes caldera, in the Eastern Mediterranean sea off Egypt (western province of the Nile Deep Sea Fan). A detailed analysis of seven Nautile dives, performed during the Nautinil cruise in 2003, focused on determining the nature, origin, importance, mechanisms and environmental impacts of the fluid escape processes from the geological observations. Seafloor maps, constructed from direct visual observations and video records made from the submersible, and sampling results, for three mud volcanoes of the caldera, Cheops, Chephren and Mykerinos show differences in activity but many common...
Tipo: Text
Palavras-chave: Mediterranean Sea; Nile Deep Sea Fan; Mud volcano; Brine seep.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11089/10627.pdf

Estimating mud expulsion rates from temperature measurements on Hakon Mosby Mud Volcano, SW Barents Sea
Provedor de dados: 5
Autores: Kaul, Norbert; Foucher, Jean-paul; Heesemann, M.
The HAkon Mosby Mud Volcano (HMMV), located on the Norwegian-Barents-Svalbard continental margin in 1250 m water depth, has been identified and described as a structure caused by upward transport of mud, pore water and gas [e.g. Eldhohn, O., Sundvor, E., Vogt, P.R., Hjelstuen, B.O., Crane, K., Nilsen, A.K., Gladczenko, T.P., 1999. SW Barents Sea continental margin heat flow and HAkon Mosby Volcano. Geo-Marine Letters 19, 29-37]. During R V Polarstern expedition ARK XIX/3b in 2003, an integrated study took place to investigate the detailed morphology, biology, chemistry and geophysical aspects of HMMV [Kiages, M., Thiede, J., Foucher, J.-P., 2004. The Expeditions ARK XIX 3a, 3b and 3c, Berichte zur Polarforschung, 488.]. In this paper, we describe a...
Tipo: Text
Palavras-chave: SW Barents Sea; Convection; Heat flow; Mud volcano; Seafloor hydrothermal system.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2002.pdf

Gas occurrence and shallow conduit systems in the Western Sea of Marmara: a review and new acoustic evidence
Provedor de dados: 5
Autores: Saritas, Hakan; Cifci, Gunay; Geli, Louis; Thomas, Yannick; Marsset, Bruno; Henry, Pierre; Grall, Celine; Rochat, Alexis.
Based on 3D and 2D high-resolution multichannel seismic reflection data in the Western High-Sea of Marmara, this study reviews shallow gas occurrence and related structures and classifies gas conduit systems within the upper, few hundred meter-thick sediment layers below the seafloor. Acoustic anomalies including high amplitude-reverse polarity reflections (bright spots), low amplitude transparent zones, chaotic or discontinuous reflections, pull-down effects, and plumes in the water column are interpreted in terms of natural gas occurrence and fluid flow structures (e.g., mud volcanoes, pockmarks). The gas occurrence is thought to be mostly of thermogenic origin. Mud volcanoes are one of the primary gas conduits forming craters on the seabed due to...
Tipo: Text
Palavras-chave: Shallow gas; Gas conduit systems; Mud volcano; Pockmark; 2D-3D seismic; Western High; Sea of Marmara.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00456/56737/58689.pdf

Microbial methane oxidation and sulfate reduction at cold seeps of the deep Eastern Mediterranean Sea
Provedor de dados: 5
Autores: Omoregie, Enoma O.; Niemann, Helge; Mastalerz, Vincent; De Lange, Gert J.; Stadnitskaia, Alina; Mascle, Jean; Foucher, Jean-paul; Boetius, Antje.
The Eastern Mediterranean hosts a variety of active cold seep systems, such as gas chimneys, mud volcanoes and pockmarks, in water depths of 500 to 3200 m. As part of the NAUTINIL expedition in 2003, the sediments of cold seeps on the Nile Deep Sea Fan (NDSF) were sampled for the first time for biogeochemical and microbiological analyses. Here we compare rates of the anaerobic oxidation of methane (AOM) and sulfate reduction (SR) as well as the microbial community structure of a variety of cold seep systems including mud volcanoes, pockmarks and brine seeps. Our results revealed strong differences in microbial activity among the different seep systems of the Eastern, Central and Western provinces of the NDSF, as well as the Olimpi field (Central...
Tipo: Text
Palavras-chave: Methane oxidation; Sulfate reduction; Archaea; Cold seeps; Mud volcano; Pockmarks; Nile Deep Sea Fan.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11087/7910.pdf

Evolution model for the Absheron Mud Volcano: from stratified sediments to fluid mud generation
Provedor de dados: 5
Autores: Blouin, Arthur; Sultan, Nabil; Pierron, Alexandra; Imbert, Patrice; Callot, Jean‐paul.
Submarine mud volcanoes are one of the most spectacular methane expulsion features at the seafloor and they represent a significant geohazard worldwide. In this work we focus on the physical processes controlling the initiation and early evolution of the Absheron mud volcano (AMV). Our analyses were carried out based on basin modeling calibrated thanks to existing seismic interpretation of the AMV, analysis of sediment samples from seabed, and data from two exploration wells. Acquired laboratory geotechnical data allowed us to derive laws considering the impact of gas exsolution on host sediment behaviors. In this study, we identified key geological and physical conditions that led to mud volcano formation: by coupling diffusion processes with...
Tipo: Text
Palavras-chave: Mud volcano; Numerical modeling; Geohazard; Sediment remobilization; Methane.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00658/77002/78258.pdf

Diversité et activité des communautés microbiennes dans des sédiments marins associés aux émissions de fluides froids
Provedor de dados: 5
Autores: Lazar, Cassandre Sara.
A large portion of the greenhouse gas methane on Earth is trapped in marine sediments. However, little methane actually reaches the hydrsphere and the atmosphere, because it is efficiently consumed by anaerobic methane-oxidizing Archaea (ANME). This methane is mainly biogenic in marine sédiments, and is produced by methanogenic Archaea. Methane ascends from deep sources to the seabed, in cold seep sites of continental margins. In order to study microbial community diversity in cold seeps, and to determine geochemical factors that control these microbial communities, we compared four geochemically and geologically distinct sites. In this work, molecular tools (PCR, RT-PCR, DGGE, cloning) as well as genetic markers (16S rRNA, mcrA, dsrB) were employed, to...
Tipo: Text
Palavras-chave: Diversité moléculaire; Archaea; Méthanogène; ANME; McrA; DsrB; DGGE; Volcan de boue; Pockmark; Saumures; Fluides froids; Méthane; Mer de Norvège; Mer Méditerranée; Sédiments.; Molecular diversity; Archaea; Methanogen; ANME; McrA; DsrB; DGGE; Mud volcano; Pockmark; Brines; Cold seep; Methane; Norwegian Sea; Mediterranean Sea; Sediments.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00031/14250/11534.pdf

Origine et circulation des fluides dans les sédiments des marges. Contribution de l'hélium et du méthane dans la compréhension des processus. Étude de 2 zones actives
Provedor de dados: 5
Autores: Chaduteau, Carine.
Fluid migration is a very important process in marine sediments on margins. Studying fluids is fundamental to constrain the energy potential of margins. Methane is the predominant gas in marine sediments, deriving primarily from the degradation of organic matter. However methane could be also generated through the serpentinization of mantle rocks underlying the sedimentary cover in some specific geodynamical settings. One way to test this hypothesis is to use helium isotopes, which are known to be powerful tracers of the fluid-mantle interaction. To this purpose, a new method has been developed for the sampling and the quantitative extraction of dissolved helium from sediment pore-waters. During the Zairov2 and Vicking cruises, samples were collected in...
Tipo: Text
Palavras-chave: Mantle; Serpentinization; Advection; Mud volcano; Pockmark; Methane; Helium; Fluid; Margin; Manteau; Serpentinisation; Advection; Volcan de boue; Pockmark; Méthane; Hélium; Fluide; Marge.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-3724.pdf

Formation de boue à partir de sédiments stratifiés dans un contexte de volcanisme de boue: le rôle du gaz
Provedor de dados: 5
Autores: Blouin, Arthur.
This manuscript assesses the role of gas in the mud generation processes by focusing on a dense and multidisciplinary dataset of the active Absheron mud volcano (AMV), South Caspian Basin. The study is divided in three main parts: definition of the mud source; analysis of the hydro-mechanical behavior of compacted sediments after gas exsolution; numerical modeling of the AMV formation.First, I identified the source of the AMV as being the Anhydritic Surakhany Fm. (ASF): seismic geomorphology evidences a depletion zone below the AMV and samples from surface mudflows indicate a Pliocene age and the same mineralogy as the ASF. The ASF is composed of interstratified anhydritic beds and low-density overpressured and undercompacted clay-rich layers. The mud...
Tipo: Text
Palavras-chave: Bassin sud caspien; Exsolution de gaz; Génération de boue; Remobilisation de sédiments; Sédiment gazeux; Volcan de boue; Sédiments (géologie) -- Teneur en gaz; Volcans de boue; Gassy sediment; Mud generation; Mud volcano; Sediment remobilization; South Caspian Basin.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00640/75223/75365.pdf

Plant growth promoting capability and genetic diversity of bacteria isolated from mud volcano and lime cave of Andaman and Nicobar Islands
Provedor de dados: 58
Autores: Venkadesaperumal,Gopu; Amaresan,Natrajan; Kumar,Krishna.
Twenty four bacterial strains from four different regions of mud volcano and lime cave were isolated to estimate their diversity, plant growth promoting and biocontrol activities to use them as inoculant strains in the fields. An excellent antagonistic effect against four plant pathogens and plant growth promoting properties such as IAA production, HCN production, phosphate solubilization, siderophore production, starch hydrolysis and hydrolytic enzymes syntheses were identified in OM5 (Pantoea agglomerans) and EM9 (Exiguobacterium sp.) of 24 studied isolates. Seeds (Chili and tomato) inoculation with plant growth promoting strains resulted in increased percentage of seedling emergence, root length and plant weight. Results indicated that co-inoculation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant growth promotion; Phytopathogens; Mud volcano; Lime cave; Amplified ribosomal DNA restriction analysis (ADRDA).
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400018