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Registros recuperados: 40
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Behaviour of rare earth and trace elements during fluid venting at cold seeps ArchiMer
Birot, Dominique; Bayon, Germain; Ruffine, Livio; Caprais, Jean-claude; Bollinger, C.; Ponzevera, Emmanuel; Rongemaille, Emmanuelle; Voisset, Michel.
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00023/13414/10493.pdf
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Corrigendum to “Multiple gas reservoirs are responsible for the gas emissions along the Marmara fault network” ArchiMer
Ruffine, Livio; Donval, Jean-pierre; Croguennec, Claire; Burnard, Pete; Lu, Hailong; Germain, Yoan; Legoix, Ludovic N.; Bignon, Laurent; Çağatay, M. Namık; Marty, Bernard; Madre, David; Pitel-roudaut, Mathilde; Henry, Pierre; Géli, Louis.
The authors regret a mistake on the value of δ13C of methane for one of the investigated gas samples. This concerns sample MRS-DV3-PE03, taken as end member and for which the correct methane δ13C value is -41.9‰ and not -34‰. The sample was collected at in situ pressure (~100 bars) from a CO2-rich seep, in a liquid state. The mistake likely results from a partial extraction (i.e. done by expansion of the sampler volume to allow vaporization) of the pressurized sample for subsampling. Additional analyses have been carried out from fully vaporized samples. This error has resulted in updating the geochemical diagrams used for the discussion, and revising both the gas origin for sample MRS-DV3-PE03 and the section entitled “Delineation of sources, reservoirs...
Tipo: Text
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00471/58253/61076.pdf
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Evidence and age estimation of mass wasting at the distal lobe of the Congo deep-sea fan ArchiMer
Croguennec, Claire; Ruffine, Livio; Dennielou, Bernard; Baudin, Francois; Caprais, Jean-claude; Guyader, Vivien; Bayon, Germain; Brandily, Christophe; Le Bruchec, Julie; Bollinger, Claire; Germain, Yoan; Droz, Laurence; Babonneau, Nathalie; Rabouille, Christophe.
On continental margins, sulfate reduction occurs within the sedimentary column. It is coupled with the degradation of organic matter and the anaerobic oxidation of methane. These processes may be significantly disturbed by sedimentary events, leading to transient state profiles for the involved chemical species. Yet, little is known about the impact of turbidity currents and mass wasting on the migration of chemical species and the redox reactions in which they are involved. Due to its connection to the River, the Congo deep-sea fan continuously receives huge amount of organic matter-rich sediments primarily transported by turbidity currents, which impact on the development of the associated ecosystems (Rabouille et al., 2016). Thus, it is well suited to...
Tipo: Text
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00363/47410/47403.pdf
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Evidence for intense REE scavenging at cold seeps from the Niger Delta margin ArchiMer
Bayon, Germain; Birot, Dominique; Ruffine, Livio; Caprais, Jean-claude; Ponzevera, Emmanuel; Bollinger, C.; Donval, Jean-pierre; Charlou, Jean-luc; Voisset, Michel; Grimaud, S..
For many trace elements, continental margins are the location of intense exchange processes between sediment and seawater, which control their distribution in the water column, but have yet to be fully understood. In this study, we have investigated the impact of fluid seepage at cold seeps on the marine cycle of neodymium. We determined dissolved and total dissolvable (TD) concentrations for REE and well-established tracers of fluid seepage (CH4, TDFe, TDMn), and Nd isotopic compositions in seawater samples collected above cold seeps and a reference site (i.e. away from any fluid venting area) from the Niger Delta margin. We also analyzed cold seep authigenic phases and various core-top sediment fractions (pore water, detrital component, easily leachable...
Tipo: Text Palavras-chave: Rare earth elements; Neodymium isotopes; Seawater; Cold seeps; Fe-Mn oxyhydroxides; Benthic fluxes.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00066/17754/15571.pdf
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Experimental study of gas hydrate formation and destabilisation using a novel high-pressure apparatus ArchiMer
Ruffine, Livio; Donval, Jean-pierre; Charlou, Jean-luc; Cremiere, Antoine; Zehnder, B. H..
A novel variable-volume type high-pressure apparatus has been designed, constructed and used for gas hydrate investigations. The apparatus has an operating temperature ranging from 253 K to 473 K and pressure ranging from 0.1 MPa to 60 MPa. Its central component consists of a viewing windows cell to which several sensors or analytical instruments can be connected. At its present configuration, a Raman spectrometer and a gas chromatograph are connected for the study of the liquid (or solid) and the gas phases respectively. The apparatus was used for the study of two different systems. The first system was composed of carbon dioxide (CO2) and water for which the hydrate formation and dissolution has been investigated by injecting water into liquid CO2. The...
Tipo: Text Palavras-chave: Gas hydrates; Thermogenic; Carbon dioxide; Formation; Destabilisation; Novel apparatus; Raman spectroscopy; Chromatography.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00006/11759/8472.pdf
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Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH4, CO2 and N2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange ArchiMer
Legoix, Ludovic; Ruffine, Livio; Deusner, Christian; Haeckel, Matthias.
This article presents gas hydrate experimental measurements for mixtures containing methane (CH 4 ), carbon dioxide (CO 2 ) and nitrogen (N 2 ) with the aim to better understand the impact of water (H 2 O) on the phase equilibrium. Some of these phase equilibrium experiments were carried out with a very high water-to-gas ratio that shifts the gas hydrate dissociation points to higher pressures. This is due to the significantly different solubilities of the different guest molecules in liquid H 2 O. A second experiment focused on CH 4 -CO 2 exchange between the hydrate and the vapor phases at moderate pressures. The results show a high retention of CO 2 in the gas hydrate phase with small pressure variations within the first hours. However, for our system...
Tipo: Text Palavras-chave: Gas hydrates; CH4; CO2; N-2; High-pressure experiments; Phase equilibrium; Gas exchange.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00452/56345/57935.pdf
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Exploring methane-hydrate formation and dissociation in geologic materials through laboratory experiments: Kinetic behavior and morphology ArchiMer
Ruffine, Livio.
To gain in-depth understanding of natural gas hydrate behavior it is necessary to identify key parameters that affect their formation, distribution and destabilization within sediments. Hydrate formation kinetics in porous media is amongst the aspects which deserve important considerations as it may provide useful information on the formation history and the formation mechanisms of natural gas hydrate accumulations. Yet, it is at its early stage. In this paper, experiments on methane hydrate formation and dissociation in porous media are reported and discussed. The first part of this work is devoted to the investigation of the kinetics of methane hydrate formation within silica sand using a custom-design apparatus. The latter is suitable for investigating...
Tipo: Text Palavras-chave: Geologic matrices; Hydrate morphology; Kinetics; Methane hydrates; Novel apparatus.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00245/35580/34209.pdf
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Fluids and processes at the seismically active fault zone in the Sea of Marmara ArchiMer
Ruffine, Livio; Cagatay, M. Namik; Geli, Louis.
Tipo: Text
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00463/57473/59866.pdf
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Focused hydrocarbon-migration in shallow sediments of a pockmark cluster in the Niger Delta (Off Nigeria) ArchiMer
De Prunele, Alexis; Ruffine, Livio; Riboulot, Vincent; Peters, Carl A.; Croguennec, Claire; Guyader, Vivien; Pape, Thomas; Bollinger, Claire; Bayon, Germain; Caprais, Jean-claude; Germain, Yoan; Donval, Jean-pierre; Marsset, Tania; Bohrmann, Gerhard; Geli, Louis; Rabiu, Abdulkarim; Lescanne, Marc; Cauquil, Eric; Sultan, Nabil.
The Niger Delta is one of the largest hydrocarbon basin offshore Africa and it is well known for the presence of active pockmarks on the seabed. During the Guineco-MeBo cruise in 2011, long cores were taken from a pockmark cluster in order to investigate the state of its current activity. Gas hydrates, oil and pore-water were sampled for geochemical studies. The resulting dataset combined with seismic data reveal that shallow hydrocarbon migration in the upper sedimentary section was focused exclusively within the pockmarks. There is a clear tendency for gas migration within the hydrate-bearing pockmarks, and oil migration within the carbonate-rich one. This trend is interpreted as a consequence of hydrate dissolution followed by carbonate precipitation...
Tipo: Text Palavras-chave: Anaerobic oxidation of methane; Cluster of pockmarks; Fluid flow; Gas hydrates; Pore-water profiles; Transient state.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00365/47647/47676.pdf
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Free gas and gas hydrates from the Sea of Marmara, Turkey Chemical and structural characterization ArchiMer
Bourry, Christophe; Chazallon, Bertrand; Charlou, Jean-luc; Donval, Jean-pierre; Ruffine, Livio; Henry, Pierre; Geli, Louis; Cagatay, M. Namik; Inan, Sedat; Moreau, Myriam.
Gas hydrates and gas bubbles were collected during the MARNAUT cruise (May-June 2007) in the Sea of Marmara along the North Anatolian Fault system, Turkey. Gas hydrates were sampled in the western part of the Sea of Marmara (on the Western High), and three gas-bubble samples were recovered on the Western High, the Central High (center part of the Sea of Marmara) and in the Cinarcik Basin (eastern part of the Sea of Marmara). Methane is the major component of hydrates (66.1%), but heavier gases such as C-2, C-3, and i-C-4 are also present in relatively high concentration. The methane contained within gas hydrate is clearly thermogenic as evidenced by a low C-1/C-2 + C-3 ratio of 3.3, and carbon and hydrogen isotopic data (delta C-13(CH4) of -44.1 parts per...
Tipo: Text Palavras-chave: Isotopes; Thermogenic gas; Gas bubbles; Gas hydrate; Sea of Marmara.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6844.pdf
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Freshwater lake to salt-water sea causing widespread hydrate dissociation in the Black Sea ArchiMer
Riboulot, Vincent; Ker, Stephan; Sultan, Nabil; Thomas, Yannick; Marsset, Bruno; Scalabrin, Carla; Ruffine, Livio; Boulart, Cedric; Ion, Gabriel.
Gas hydrates, a solid established by water and gas molecules, are widespread along the continental margins of the world. Their dynamics have mainly been regarded through the lens of temperature-pressure conditions. A fluctuation in one of these parameters may cause destabilization of gas hydrate-bearing sediments below the seafloor with implications in ocean acidification and eventually in global warming. Here we show throughout an example of the Black Sea, the world’s most isolated sea, evidence that extensive gas hydrate dissociation may occur in the future due to recent salinity changes of the sea water. Recent and forthcoming salt diffusion within the sediment will destabilize gas hydrates by reducing the extension and thickness of their thermodynamic...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00418/52981/53916.pdf
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Gas and seismicity within the Istanbul seismic gap ArchiMer
Geli, Louis; Henry, P.; Grall, Celine; Tary, Jean-baptiste; Lomax, A.; Batsi, Evangelia; Riboulot, Vincent; Cros, Estelle; Gurbuz, C.; Isik, S. E.; Sengor, A. M. C.; Le Pichon, X.; Ruffine, Livio; Dupre, Stephanie; Thomas, Yannick; Kalafat, D.; Bayrakci, G.; Coutellier, Q.; Regnier, Thibaut; Westbrook, Graham; Saritas, H.; Cifci, G.; Cagatay, M. N.; Ozeren, M. S.; Gorur, N.; Tryon, M.; Bohnhoff, M.; Gasperini, L.; Klingelhoefer, Frauke; Scalabrin, Carla; Augustin, Jean-marie; Embriaco, D.; Marinaro, G.; Frugoni, F.; Monna, S.; Etiope, G.; Favali, P.; Becel, A..
Understanding micro-seismicity is a critical question for earthquake hazard assessment. Since the devastating earthquakes of Izmit and Duzce in 1999, the seismicity along the submerged section of North Anatolian Fault within the Sea of Marmara (comprising the “Istanbul seismic gap”) has been extensively studied in order to infer its mechanical behaviour (creeping vs locked). So far, the seismicity has been interpreted only in terms of being tectonic-driven, although the Main Marmara Fault (MMF) is known to strike across multiple hydrocarbon gas sources. Here, we show that a large number of the aftershocks that followed the M 5.1 earthquake of July, 25th 2011 in the western Sea of Marmara, occurred within a zone of gas overpressuring in the 1.5–5 km depth...
Tipo: Text
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00439/55072/56500.pdf
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Gas hydrate distributions in sediments of pockmarks from the Nigerian Margin - Results and interpretation from shallow drilling ArchiMer
Wei, Jiangong; Pape, Thomas; Sultan, Nabil; Colliat, Jean-louis; Himmler, Tobias; Ruffine, Livio; De Prunele, Alexis; Dennielou, Bernard; Garziglia, Sebastien; Marsset, Tania; Peters, Carl A.; Rabiu, Abdulkarim; Bohrmann, Gerhard.
A joint research expedition between the French IFREMER and the German MARUM was conducted in 2011 using the R/V Pourquoi pas? to study gas hydrate distributions in a pockmark field (1141 – 1199 meters below sea surface) at the continental margin of Nigeria. The sea floor drill rig MeBo of MARUM was used to recover sediments as deep as 56.74 meters below seafloor. The presence of gas hydrates in specific core sections was deduced from temperature anomalies recorded during continuous records of infrared thermal scanning and anomalies in pore water chloride concentrations. In situ sediment temperature measurements showed elevated geothermal gradients of up to 258 °C/km in the center of the so-called pockmark A which is up to 4.6 times higher than that in the...
Tipo: Text Palavras-chave: Gas hydrate; Pockmark; Chloride profile; Infrared thermal imaging; Fluid flow; Nigerian continental margin; MeBo drill rig.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00213/32382/30846.pdf
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Gas Hydrates 1: Fundamentals, Characterization and Modeling ArchiMer
Broseta, Daniel; Ruffine, Livio; Desmedt, Arnaud.
Gas hydrates, or clathrate hydrates, are crystalline solids resembling ice, in which small (guest) molecules, typically gases, are trapped inside cavities formed by hydrogen-bonded water (host) molecules. They form and remain stable under low temperatures – often well below ambient conditions – and high pressures ranging from a few bar to hundreds of bar, depending on the guest molecule. Their presence is ubiquitous on Earth, in deep-marine sediments and in permafrost regions, as well as in outer space, on planets or comets. In addition to water, they can be synthesized with organic species as host molecules, resulting in milder stability conditions: these are referred to as semi-clathrate hydrates. Clathrate and semi-clathrate hydrates are being...
Tipo: Text
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00453/56506/58852.pdf
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Gas Hydrates 2 : Geoscience Issues and Potential Industrial Applications ArchiMer
Ruffine, Livio; Broseta, Daniel; Desmedt, Arnaud.
In recent years, interest for clathrate hydrates has increased, motivated both by their fascinating physiochemical and thermophysical properties and their industrial and practical promises in various areas of application. Following the 2017 publication of Volume 1, which focused on fundamental aspects, modeling and characterization methods, this volume gathers a series of contributions addressing the natural occurrence of clathrate hydrates in sediments on Earth, with implications for the methane cycle, geohazards and energy resources, and then a few promising industrial applications. This volume is intended for scientists, PhD students and engineers who wish to start working on clathrate hydrates and/or want to acquire general knowledge in this area. It...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00453/56507/58855.pdf
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Gas Seepage along the Edge of the Aquitaine Shelf (France): Origin and Local Fluxes ArchiMer
Ruffine, Livio; Donval, Jean-pierre; Croguennec, Claire; Bignon, Laurent; Birot, Dominique; Battani, Anne; Bayon, Germain; Caprais, Jean-claude; Lanteri, Nadine; Levache, Denis; Dupre, Stephanie.
During the scientific expedition GAZCOGNE2 at the Bay of Biscay nine gas seeps were sampled for the first time and their flux was measured using an in situ pressure-preservation sampler (PEGAZ, ©IFREMER). Overall, three sites were investigated to determine the nature and the origin of the gases bubbling at the seafloor and forming acoustic plumes into the water column, as this was the question raised fromthe first geologic study of the area.This has guided our study and accordingly corresponds to themain purpose of the present article.Thus, themolecular and isotopic (𝛿D and 𝛿13C) analyses revealed that the gas seeps were primarily composed of methane. Both methane and ethane are of microbial origin, and the former has been generated by...
Tipo: Text
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00394/50579/51270.pdf
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Geochemical Characteristics of Iron in Sediments from the Sea of Marmara ArchiMer
Yang, Hailin; Lu, Hailong; Ruffine, Livio.
Two ~1000 cm long sediment cores were recovered from the Sea of Marmara, one with the occurrence of gas hydrates in the Western High, and the other without hydrates in the Cinarcik Basin. Differences in mineralogical and chemical compositions have been identified between the two sediment cores. Based on the results of the mineralogical and geochemical analyses, the main sources of the sediments are quite similar for both investigated areas, but the authigenic components are different, particularly iron sulfides and carbonates. Authigenic Fe(II) carbonate are much higher in Core MRS-CS-05 in the Western High, while crystalline Fe(III) phases are more abundant in Core MRS-CS-16 in the Cinarcik Basin. Notably, the enrichments of greigite (Fe3S4), a metastable...
Tipo: Text Palavras-chave: Iron geochemistry; The Sea of Marmara; Sediment; Redox environment.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00423/53455/54347.pdf
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Geochemical Dynamics of the Natural-Gas Hydrate System in the Sea of Marmara, Offshore Turkey ArchiMer
Ruffine, Livio; Fandino Torres, Olivia; Etoubleau, Joel; Cheron, Sandrine; Donval, Jean-pierre; Germain, Yoan; Ponzevera, Emmanuel; Guyader, Vivien; Dennielou, Bernard; Etiope, Giuseppe; Gasperini, Luca; Bortoluzzi, Giovanni; Henry, Pierre; Grall, Celine; Cagatay, M. Namik; Charlou, Jean-luc; Geli, Louis.
Tipo: Text
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00139/24982/23065.pdf
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Interpretation of Late‐Pleistocene/Holocene transition in the Sea of Marmara from geochemistry of bulk carbonates ArchiMer
Liu, Yujia; Lu, Hailong; Yin, Xijie; Ruffine, Livio; Çağatay, M. Namik; Yang, Hailin; Chen, Chunqing; He, Dong; Zhu, Zhenli; Yalamaz, Burak.
Isotopic, mineralogical and elemental analyses have been conducted for the geochemical characteristics of the bulk carbonates in the sediment cores from the Western High and Çınarcık Basin in the Sea of Marmara to investigate the authigenic, biogenic and detrital components and their possible use in paleoceanographic studies. The Western High is a relatively shallow (‐500 to ‐800 m) compressional area characterized by relatively low sedimentation rates (30‐40 cm/kyr) whereas the Çnarcık Basin is a deep (~1250 m) transtentional area represented by high sedimentation rates (>1 m/kyr). Both 87Sr/86Sr and δ18O of bulk carbonates from the Western High exhibit significant variations, increasing steeply from 87Sr/86Sr of 0.708437 to 0.708916 and δ18O of ‐3.2‰...
Tipo: Text Palavras-chave: Bulk carbonates; Carbon and oxygen isotopes; Strontium isotopes; Transgression; Anaerobic biodegradation; Sea of Marmara.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00514/62518/66821.pdf
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Investigation on the geochemical dynamics of a hydrate-bearing pockmark in the Niger Delta ArchiMer
Ruffine, Livio; Caprais, Jean-claude; Bayon, Germain; Riboulot, Vincent; Donval, Jean-pierre; Etoubleau, Joel; Birot, Dominique; Pignet, Patricia; Rongemaille, Emmanuelle; Chazallon, Bertrand; Grimaud, Sylvie; Adamy, Jerome; Charlou, Jean-luc; Voisset, Michel.
A joint industrial project with IFREMER and Total provides insights into the tectonic setting and the geochemistry of a large active pockmark offshore W-Africa in the Niger Delta. The study combines both geophysical (seismic) and geochemical data to infer the dynamics of a 300 m wide pockmark located at 667 m water depth. Two Calypso cores, one at the centre and one outside the pockmark, along with three box-cores, two inside the pockmark and one outside, were collected to study the geochemistry of gas hydrates, carbonates and pore waters. Two seismic lines, a 3D high resolution random line and a 2D high resolution seismic line, provide a good description of the plumbing of the system. The integrated results depict a very active pockmark characterized by...
Tipo: Text Palavras-chave: Active pockmark; Anaerobic oxidation of methane; Gas hydrates; Carbonates; Seismic surveys; Fault system; U/Th dating.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00139/24981/23102.pdf
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