25 results on '"Ruffine L"'
Search Results
2. Characterizing the variability of natural gas hydrate composition from a selected site of the Western Black Sea, off Romania
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Chazallon, B., Rodriguez, C.T., Ruffine, L., Carpentier, Y., Donval, J.-P., Ker, S., and Riboulot, V.
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- 2021
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3. Types of fluid-related features controlled by sedimentary cycles and fault network in deepwater Nigeria
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Marsset, T., Ruffine, L., Gay, A., Ker, S., and Cauquil, E.
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- 2018
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4. Corrigendum to “Phase behaviour of mixed-gas hydrate systems containing carbon dioxide” [J. Chem. Thermodyn. 42 (2010) 605–611]
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Ruffine, L. and Trusler, J.P.M.
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- 2024
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5. Influence of impurities (nitrogen and methane) on the CO2 storage capacity as sediment-hosted gas hydrates – Application in the area of the Celtic Sea and the Bay of Biscay
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Burnol, A., Thinon, I., Ruffine, L., and Herri, J.-M.
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- 2015
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6. Experimental study of gas hydrate formation and destabilisation using a novel high-pressure apparatus
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Ruffine, L., Donval, J.P., Charlou, J.L., Cremière, A., and Zehnder, B.H.
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- 2010
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7. Phase behaviour of mixed-gas hydrate systems containing carbon dioxide
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Ruffine, L. and Trusler, J.P.M.
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- 2010
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8. Sound-Speed Sensor for Gas Pipeline Applications
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Ruffine, L. and Trusler, J. P. M.
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- 2009
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9. Gas and seismicity within the Istanbul seismic gap
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Geli L., Henry P., Grall C., Tary J.-B., Lomax A., Batsi E., Riboulot V., Cros E., Gurbuz C., Islk S.E., Sengor A.M.C., Le Pichon X., Ruffine L., Dupre S., Thomas Y., Kalafat D., Bayrakci G., Coutellier Q., Regnier T., Westbrook G., Saritas H., Cifci G., Cagatay M.N., Ozeren M.S., Gorur N., Tryon M., Bohnhoff M., Gasperini L., Klingelhoefer F., Scalabrin C., Augustin J.-M., Embriaco D., Marinaro G., Frugoni F., Monna S., Etiope G., Favali P., Becel A., Institut Français de Recherche pour l'Exploitation de la Mer - Brest ( IFREMER ), Institut Français de Recherche pour l'Exploitation de la Mer ( IFREMER ), Centre européen de recherche et d'enseignement de géosciences de l'environnement ( CEREGE ), Centre National de la Recherche Scientifique ( CNRS ) -Institut de Recherche pour le Développement ( IRD ) -Aix Marseille Université ( AMU ) -Collège de France ( CdF ) -Institut National de la Recherche Agronomique ( INRA ) -Institut national des sciences de l'Univers ( INSU - CNRS ), Lamont-Doherty Earth Observatory ( LDEO ), Columbia University [New York], University of Alberta [Edmonton], Unité de recherche Géosciences Marines (Ifremer) ( GM ), IFREMER, Institut des Sciences Chimiques de Rennes ( ISCR ), Université de Rennes 1 ( UR1 ), Université de Rennes ( UNIV-RENNES ) -Université de Rennes ( UNIV-RENNES ) -Ecole Nationale Supérieure de Chimie de Rennes-Institut National des Sciences Appliquées ( INSA ) -Centre National de la Recherche Scientifique ( CNRS ), Department of Earth and Environmental Sciences, University of Birmingham [Birmingham], Dokuz Eylul University, Institute of Marine Sciences and Technology, Dokuz Eylül University, Istanbul Technical University, GeoForschungsZentrum - Helmholtz-Zentrum Potsdam ( GFZ ), Istituto di Science Marine - ISMAR (Italy), Istituto Nazionale di Geofisica e Vulcanologia, Institut de Physique du Globe de Paris ( IPGP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -IPG PARIS-Université Paris Diderot - Paris 7 ( UPD7 ) -Université de la Réunion ( UR ) -Centre National de la Recherche Scientifique ( CNRS ), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Lamont-Doherty Earth Observatory (LDEO), University of Alberta, Collège de France (CdF (institution)), Unité de recherche Géosciences Marines (Ifremer) (GM), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), School of Geography, Earth and Environmental Sciences [Birmingham], Dokuz Eylül Üniversitesi = Dokuz Eylül University [Izmir] (DEÜ), GeoForschungsZentrum - Helmholtz-Zentrum Potsdam (GFZ), Istituto di Science Marine (ISMAR ), Consiglio Nazionale delle Ricerche (CNR), Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Roma (INGV), Institut de Physique du Globe de Paris (IPGP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), EU [036851], MARSITE Integrated Project [308417], CNR, Ifremer, CNRS [MA201301A], Institut Carnot Ifremer-Edrome [06/11/2013], Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Géosciences Marines (GM), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), and ANR-16-CE03-0010,MAREGAMI2016,Caractérisation de la lacune sismique dans la région d'Istanbul(2016)
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[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics ,architecture ,north anatolian fault ,central basin ,sea ,[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,Science ,[SDU.STU]Sciences of the Universe [physics]/Earth Sciences ,[ SDU.STU ] Sciences of the Universe [physics]/Earth Sciences ,[ SDU.STU.TE ] Sciences of the Universe [physics]/Earth Sciences/Tectonics ,trough ,izmit earthquake ,Article ,[ SDU.STU.GP ] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,main marmara fault ,evolution ,turkey ,Medicine ,NORTH ANATOLIAN FAULT ,MAIN MARMARA FAULT ,IZMIT EARTHQUAKE ,CENTRAL BASIN ,SEA ,EVOLUTION ,ARCHITECTURE ,TURKEY ,TROUGH ,ZONE ,zone ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience; 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 range, from where pressurized gas is expected to migrate along the MMF, up to the surface sediment layers. Hence, gas-related processes should also be considered for a complete interpretation of the micro-seismicity (similar to M < 3) within the Istanbul offshore domain.
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- 2018
10. Carbon and silica megasink in deep-sea sediments of the Congo terminal lobes
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Rabouille, C., Dennielou, B., Baudin, F., Raimonet, M., Droz, L., Khripounoff, A., Martinez, P., Mejanelle, L., Michalopoulos, P., Pastor, L., Pruski, A., Ragueneau, O., Reyss, J.-L., Ruffine, L., Schnyder, J., Stetten, E., Taillefert, M., Tourolle, J., and Olu, K.
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- 2019
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11. The Aquitaine Shelf Edge (Bay of Biscay): A Primary Outlet for Microbial Methane Release.
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Dupré, S., Loubrieu, B., Pierre, C., Scalabrin, C., Guérin, C., Ehrhold, A., Ogor, A., Gautier, E., Ruffine, L., Biville, R., Saout, J., Breton, C., Floodpage, J., and Lescanne, M.
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METHANE ,OFFSHORE sailing ,CONTINENTAL shelf ,WATER depth ,SUBMARINE topography ,GAS seepage ,METHANE hydrates - Abstract
A few thousand (2,612) seeps are releasing microbial methane bubbles from the seafloor at the Aquitaine Shelf edge (Bay of Biscay) at shallow water depths (140–220 m). This methane contributes to the formation of meter‐scale subcircular carbonate structures, which are (sub)outcropping over 375 km2. Based on in situ flow rate measurements and acoustic data, and assuming steady and continuous fluxes over time, the methane entering the water column is estimated at 144 Mg/yr. Microbial methane circulation has been ongoing for at least a few thousand years. This discovery highlights the importance of microbial methane generation, disconnected from deep thermogenic sources and gas hydrates, at continental shelves. The shelf edge may be viewed as a focus area for methane circulation and release and related diagenesis, all having an impact on the shaping of continental shelves and potentially on the oceanic and atmospheric carbon budget. Plain Language Summary: At the Aquitaine Shelf of the Bay of Biscay (Northeast Atlantic Ocean), the recent acoustic, chemical, and visual investigations of microbial methane release at the seafloor have led to the discovery of a vast fluid system. This methane escapes as bubbles from the seafloor into the seawater at 2,612 sites, all located at shallow water depths (140–220 m) along the edge of the continental shelf. Methane‐derived authigenic carbonates that are by‐products of gas seepage cover the (sub)seafloor over a large area of 375 km2. These carbonates form subcircular meter‐scale pavements and mounds, less than 2 m in height above the surrounding seafloor. Based on the growth rate of authigenic carbonates, it can be inferred that methane circulation has occurred for at least a few thousand years. The amount of methane released from the Aquitaine Shelf seafloor into the water column, estimated at 144 t/yr, questions the fate of the methane in the ocean and its possible passage to the atmosphere with therefore consequent potential contribution to the oceanic and atmospheric carbon budget over time. Key Points: Up to 2,612 gas bubbling sites at the Aquitaine Shelf edge release 144 Mg/yr of microbial methane into the water columnMethane‐derived authigenic (sub)outcropping carbonates cover 375 km2Methane‐rich fluids have been circulating for at least a few thousand years [ABSTRACT FROM AUTHOR]
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- 2020
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12. Pore water geochemistry at two seismogenic areas in the Sea of Marmara
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Ruffine L., Germain Y., Polonia A., De Prunele A., Croguennec C., Donval J.-P., Pitel-Roudaut M., Ponzevera E., Caprais J.-C., Brandily C., Grall C., Bollinger C., Geli L., and Gasperini L.
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Sea of Marmara ,North Anatolian Fault ,pore water geochemistry ,anaerobic oxidation of methane ,seismic activity - Abstract
Within the Sea of Marmara, the highly active North Anatolian Fault (NAF) is responsible for major earthquakes (Mw>=7), and acts as a pathway for fluid migration from deep sources to the seafloor. This work reports on pore water geochemistry from three sediment cores collected in the Gulfs of Izmit and Gemlik, along the Northern and the Middle strands of the NAF, respectively. The resulting data set shows that anaerobic oxidation of methane (AOM) is the major process responsible for sulfate depletion in the shallow sediment. In the Gulf of Gemlik, depth concentration profiles of both sulfate and alkalinity exhibit a kink-type profile. The Sulfate Methane Transition Zone (SMTZ) is located at moderate depth in the area. In the Gulf of Izmit, the low concentrations observed near the seawater-sediment interface for sulfate, calcium, strontium, and magnesium result from rapid geochemical processes, AOM, and carbonate precipitation, occurring in the uppermost part of the sedimentary column and sustained by free methane accumulation. Barite dissolution and carbonate recrystallization have also been identified at deeper depth at the easternmost basin of the Gulf of Izmit. This is supported by the profile of the strontium isotope ratios (87Sr/86Sr) as a function of depth which exhibits negative anomalies compared to the modern seawater value. The strontium isotopic signature also shows that these carbonates had precipitated during the reconnection of the Sea of Marmara with the Mediterranean Sea. Finally, a first attempt to interpret the sulfate profiles observed in the light of the seismic activity at both sites is presented. We propose the hypothesis that seismic activity in the areas is responsible for the transient sulfate profile, and that the very shallow SMTZ depths observed in the Gulf of Izmit is likely due to episodic release of significant amount of methane.
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- 2015
13. Discovery of widespread biogenic methane emissions and authigenic carbonate mound-like structures at the Aquitaine shelf (Bay of Biscay)
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Dupré, Stéphanie, Loubrieu, B., Scalabrin, C., Ehrhold, A., Gautier, E., Ruffine, L., Pierre, Catherine, Battani, A., Le Bouffant, N., Berger, L., Biogéochimie-Traceurs-Paléoclimat (BTP), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), AGU, Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636))
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[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2014
14. Free gas and gas hydrates from the Sea of Marmara, Turkey Chemical and structural characterization
- Author
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Bourry, C., Chazallon, B., Charlou, J.L., Donval, J.P., Ruffine, L., Henry, P, Geli, L., Namik Cagatay, M., Inan, S., Moreau, M., Unité de recherche Géosciences Marines (Ifremer) (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Istanbul Technical University, Istanbul, TUBITAK Institute of Earth and Marine Sciences, TUBITAK Marmara Research Center (TUNITAK-MAM), Laboratoire de Spectrochimie Infrarouge et Raman - UMR 8516 (LASIR), Centre National de la Recherche Scientifique (CNRS)-Université de Lille, Géosciences Marines (GM), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Istanbul Technical University (ITÜ), Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 (LASIRE), Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), and Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille Institut (CLIL)
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Sea of Marmara ,Isotopes ,Gas hydrate ,[CHIM.OTHE]Chemical Sciences/Other ,Thermogenic gas ,Gas bubbles - Abstract
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 Çinarcik Basin (eastern part of the Sea of Marmara). Methane is the major component of hydrates (66.1%), but heavier gases such as C2, C3, and i-C4 are also present in relatively high concentration. The methane contained within gas hydrate is clearly thermogenic as evidenced by a low C1/C2 + C3 ratio of 3.3, and carbon and hydrogen isotopic data (δ13CCH4 of − 44.1‰ PDB and δDCH4 of − 219‰ SMOW). A similar signature is found for the associated gas bubbles (C1/C2 + C3 ratio of 24.4, δ13CCH4 of − 44.4‰ PDB) which have the same composition as natural gas from K. Marmara-af field. Gas bubbles from Central High show also a thermogenic origin as evidenced by a C1/C2 + C3 ratio of 137, and carbon and hydrogen isotopic data (δ13CCH4 of − 44.4‰ PDB and δDCH4 of − 210‰ SMOW), whereas those from the Çinarcik Basin have a primarily microbial origin (C1/C2 + C3 ratio of 16,600, δ13CCH4 of − 64.1‰ PDB). UV-Raman spectroscopy reveals structure II for gas hydrates, with CH4 trapped in the small (512) and large (51264) cages, and with C2H6, C3H8 and i-C4H10 trapped in the large cages. Hydrate composition is in good agreement with equilibrium calculations, which confirm the genetic link between the gas hydrate and gas bubbles at Western High and the K.Marmara-af offshore gas field located north of the Western High. We calculate the characteristics of the hydrate stability zone at Western High and in the Çinarcik Basin using the CSM-GEM computer program. The base of the structure II hydrate stability field is at about 100 m depth below the seafloor at the Western High site, whereas in the Çinarcik Basin, P–T conditions at the seafloor correspond to the uppermost range for structure I hydrate formation from microbial gas.
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- 2009
15. Evidence for intense REE scavenging at cold seeps from the Niger Delta margin
- Author
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Bayon, G., Birot, D., Ruffine, L., Caprais, J.-C., Ponzevera, E., Bollinger, C., Donval, J.-P., Charlou, J.-L., Voisset, M., and Grimaud, S.
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- 2011
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16. Pockmark formation and evolution in deep water Nigeria: Rapid hydrate growth versus slow hydrate dissolution.
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Sultan, N., Bohrmann, G., Ruffine, L., Pape, T., Riboulot, V., Colliat, J.-L., De Prunelé, A., Dennielou, B., Garziglia, S., Himmler, T., Marsset, T., Peters, C.A., Rabiu, A., and Wei, J.
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- 2014
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17. Living (stained) deep-sea foraminifera from the Sea of Marmara: A preliminary study.
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Fontanier, C., Dissard, D., Ruffine, L., Mamo, B., Ponzevera, E., Pelleter, E., Baudin, F., Roubi, A., Chéron, S., Boissier, A., Gayet, N., Bermell-Fleury, S., Pitel, M., Guyader, V., Lesongeur, F., and Savignac, F.
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FORAMINIFERA , *METHANE , *OXYGENATION (Chemistry) , *DEOXYGENATION , *CHEMICAL reactions , *ALLOGROMIIDAE - Abstract
Abstract In this preliminary study, we investigate living (stained) foraminifera from the Sea of Marmara. We focus on the faunal composition and geochemical signatures (trace elements, carbon and oxygen stable isotopes) in foraminiferal tests at two deep-sea sites (329 and ~ 1240 m depth respectively). Documented by ROV observations and sampling, both study areas are heterogeneous (including bacterial mats and carbonate concretions), proximal to cold seeps and consist of dysoxic bottom water (O 2 < 20 µmol/L). The prevailing dysoxia at both study areas restricts foraminiferal diversity to very low values (S < 9, H' < 0.97). Stress-tolerant species Bolivina vadescens and Globobulimina affinis dominate living faunas at both sites. The highest foraminiferal standing stock is recorded at the shallowest site underneath a spreading bacterial mat. No benthic foraminifera from either site possess geochemical signatures of methane seepage. Our biogeochemical results show that use of foraminiferal Mn/Ca ratios as a proxy for bottom water oxygenation depends strongly on regional physiography, sedimentary processes and water column structure. [ABSTRACT FROM AUTHOR]
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- 2018
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18. Methane-derived stromatolitic carbonate crust from an active fluid seepage in the western basin of the Sea of Marmara: Mineralogical, isotopic and molecular geochemical characterization.
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Akhoudas, C., Chevalier, N., Blanc-Valleron, M.-M., Klein, V., Mendez-Millan, M., Demange, J., Dalliah, S., Rommevaux, V., Boudouma, O., Pierre, C., and Ruffine, L.
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SEEPAGE , *SOIL percolation , *STROMATOLITES , *ARAGONITE , *METHANOTROPHS , *METHANE - Abstract
Abstract Cold seeps along the North Anatolian fault in the Sea of Marmara (Turkey) were explored during submersible dives of the Marsite cruise in November 2014 when sediments, pore waters and carbonate crusts were sampled at active fluid seeping sites. In this study, we investigate the mineralogy, carbon and oxygen isotopic compositions and the lipid biomarkers of a carbonate crust from the western Tekirdağ basin of the Sea of Marmara. This crust exhibits a laminated domal structure that resembles stromatolite. The mineralogy of authigenic seep-carbonate is mostly represented by aragonite associated with minor amounts of high-magnesian calcite. The abundance of pyrite associated with the authigenic seep-carbonate points to very intense bacterial sulfate reduction. The carbon (−42.6‰ to −34.4‰) and oxygen (−1.5‰ to +1.1‰) isotopic compositions of the authigenic seep-carbonate crust indicate that carbonate precipitation was related to anaerobic oxidation of methane and occurred in mixtures of bottom seawater with brackish water expelled from the underlying sediments. Abundant microbial lipid biomarkers with negative δ13C values (−121‰ to −96‰), confirm that anaerobic oxidation of methane (AOM) coupled with sulfate reduction, was mediated by methanotrophic archaea (ANME) and sulfate reducing bacteria (SRB). Diagnostic lipid fingerprints indicate that ANME-2 archaea and associated SRB were the prevalent AOM-mediating consortia, which characterize moderate to high methane flow at this site. Moreover, changes in microbial lipid distribution within the carbonate crust suggest a variation in the intensity of methane emission. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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19. Sulfate-dependent anaerobic oxidation of methane at a highly dynamic bubbling site in the Eastern Sea of Marmara (Çinarcik Basin).
- Author
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Teichert, B.M.A., Chevalier, N., Gussone, N., Bayon, G., Ponzevera, E., Ruffine, L., and Strauss, H.
- Subjects
- *
METHANE , *CARBONATE analysis , *MICROBIAL communities , *BACTERIAL communities , *STRONTIUM , *CALCIUM - Abstract
Abstract During the MARSITECruise expedition in November 2014 on board the RV Pourquoi Pas? , multidisciplinary sampling was carried out with the ROV Victor 6000 in order to investigate biogeochemical processes taking place at cold seep environments in the Sea of Marmara. Pore water, bottom water, sediment and authigenic carbonate samples were collected from two short push cores (MRS-DV5-PC04 − 8 cm, MRS-DV5-PC01 − 12.5 cm) at an active methane bubbling site in the southeastern part of the Çinarcik Basin. Sulfate sulfur and oxygen isotope data as well as sulfide isotope data indicate that sulfate-dependent anaerobic oxidation of methane is the dominant process in the sediments. This is confirmed by archaeal lipids diagnostic for anaerobic methane oxidizers detected with strong 13C-depletions. The available data even allows to distinguish the dominant AOM assemblages. Specific lipid patterns are consistent with a dominance of ANME-2 archaea within the microbial community. Abundant authigenic carbonates (mostly aragonite), found at all depths, show a narrow range in δ13C values between −27.69‰ and −33.40‰. The carbon isotopic composition of the dissolved inorganic carbon as well as strontium and calcium isotopes confirm that the current reaction zone (sulfate-methane transition zone) starts at the bottom of the core. All shallower carbonates are witnesses of paleo seepage activity. U-Th dating of four pure aragonite samples show the short time span that is preserved in core MRS-DV5-PC01 (235 ± 60 yr B.P.). Two major earthquakes of 1766 CE and 1754 CE in the Çinarcik Basin might potentially have triggered the increased seepage of methane at this location. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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20. Characterization of porous texture in composite adsorbents based on exfoliated graphite and polyfurfuryl alcohol
- Author
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Suárez-García, F., Martínez-Alonso, A., Tascón, J.M.D., Ruffine, L., Furdin, G., Marêché, J.F., and Celzard, A.
- Subjects
- *
ACTIVATED carbon , *ADSORPTION (Chemistry) - Abstract
Composite activated carbon monoliths were prepared from polyfurfuryl alcohol-impregnated compressed expanded graphite (CEG) blocks by pyrolysis at 923 K followed by steam activation at 1073 K. The porous texture of these materials was analysed from physical adsorption measurements of N2 at 77 K and CO2 at 273 K. Pyrolysis gives rise to a nitrogen surface area higher than for many conventional carbonised precursors of active carbons. Activation develops even more the porosity. At low burn-offs, there is principally creation of new pores (including ultramicropores). At higher burn-offs (of the order of 40%), opening of preexisting pores takes place. The materials obtained are essentially microporous and exhibit a rather narrow pore size distribution. [Copyright &y& Elsevier]
- Published
- 2002
21. Evidence for methane isotopic bond re-ordering in gas reservoirs sourcing cold seeps from the Sea of Marmara.
- Author
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Giunta, T., Labidi, J., Kohl, I.E., Ruffine, L., Donval, J.P., Géli, L., Çağatay, M.N., Lu, H., and Young, E.D.
- Subjects
- *
GAS reservoirs , *WATER temperature , *METHANE , *FOREIGN exchange rates , *COLD gases - Abstract
• Δ13CH 3 D and Δ12CH 2 D 2 investigated in marine cold seeps from the Sea of Marmara. • Microbial/thermogenic samples show equilibrium temperatures up to 130 °C. • Non-enzymatic mechanism for isotope bond ordering to reservoirs temperatures. The measurement of methane clumped isotopologues (Δ 13 CH 3 D and Δ 12 CH 2 D 2) allows exploring isotope bond ordering within methane molecules, and may reveal equilibrium temperatures. Whether such temperature reflects the formation or re-equilibration temperature of the methane is not well understood, but would have critical implications for the use of methane clumped isotopologues as geo-thermometers. Here we investigate gas bubbles from vigorous emissions at cold seeps (n = 14) in the Sea of Marmara, Turkey. These cold seeps are sourced from deeper sedimentary reservoirs. Conventional geochemical tracers such as carbon and hydrogen bulk isotopic ratios (13C/12C and D/H) or n -alkane molecular ratios, suggest these gases reflect various degrees of mixing between thermogenic and microbial sources. Some samples would generally be considered purely microbial in origin (C 1 / C 2 + > 1500 ; δ 13 C < − 60 ‰). We report measurements of Δ 13 CH 3 D and Δ 12 CH 2 D 2 showing that a fraction of those gases are in internal thermodynamic equilibrium, with the abundances of the two mass-18 isotopologues indicating concordant temperatures of ∼90 °C and ∼130 °C. These concordant temperatures are recorded by gases of putative microbial and thermogenic origin; the temperatures of equilibration are irrespective of the formation mechanism of the gases. We conclude that the two high-temperatures recorded by Δ 13 CH 3 D and Δ 12 CH 2 D 2 are best explained by non-enzymatic re-equilibration at two local subsurface temperatures. First principles suggest that unequal rates of exchange are possible. Disequilibrium signatures where the two isotopologues yield discordant apparent temperatures are exhibited by other samples. In those cases the data define a trend of variable Δ 13 CH 3 D at nearly constant Δ 12 CH 2 D 2. These signatures are enigmatic, and we investigate and reject multiple possible explanations including mixing, diffusion or Anaerobic Oxidation of Methane. Different rates of re-equilibration between the two rare isotopologues are implied, although lacks experimental foundation at present. In general, all of these data point towards re-equilibration of the mass-18 methane isotopologues as an important process. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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22. Volume and non-equilibrium crystallization of clathrate hydrates
- Author
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Baptiste Bouillot, Jean-Michel Herri, Centre Sciences des Processus Industriels et Naturels (SPIN-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire Georges Friedel (LGF-ENSMSE), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Département Procédés pour l'Environnement et Géoressources (PEG-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), BROSETA, D., RUFFINE, L., DESMEDT, A., Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Toucas, Andrée-Aimée, BROSETA, D., RUFFINE, L., and DESMEDT, A.
- Subjects
crystallization ,[SPI.GPROC] Engineering Sciences [physics]/Chemical and Process Engineering ,LHE ,Clathrate hydrate ,non-equilibrium thermodynamic models ,Thermodynamics ,kinetic models ,liquid hydrate equilibrium ,02 engineering and technology ,symbols.namesake ,020401 chemical engineering ,Phase (matter) ,[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ,Gas composition ,0204 chemical engineering ,Physics::Chemical Physics ,Equilibrium constant ,Component (thermodynamics) ,Chemistry ,021001 nanoscience & nanotechnology ,clathrate hydrates ,Gibbs free energy ,Volume (thermodynamics) ,symbols ,0210 nano-technology ,Hydrate - Abstract
International audience; Phase equilibria involving clathrate hydrates are usually modeled by using equations and tools from classical thermodynamics. For given temperature and pressure conditions (T and P), the equilibria between the different phases (hydrate, liquids, vapor, etc.) are obtained by minimizing the Gibbs free energy or, if there is no ambiguity, by equalizing the chemical potentials (or fugacities) of each component in each phase, as described in numerous studies .The usual approach for modeling liquid hydrate equilibrium (LHE) consists of determining the equilibrium curve (PT) for a given gas composition. In addition, for this given gas composition, the hydrate cage filling is commonly determined from a Langmuir-like approach. Furthermore, the compositions of the fluid phases in equilibrium with the hydrate are also of interest. Gibbs phase law states that the degree of freedom (or number of independent intensive variables) is 2 + n – Φ, where n is the number of components and Φ is the number of phases at equilibrium. As a result, considering the vapor–liquid hydrate equilibrium, the hydrate composition xH (fraction of guest molecules in occupied cavities) can be seen as a function of the temperature T (or pressure P) and the liquid (or gas) composition.
- Published
- 2017
23. A GC-SSIM-CRDS system: Coupling a gas chromatograph with a Cavity Ring-Down Spectrometer for onboard Twofold analysis of molecular and isotopic compositions of natural gases during ocean-going research expeditions.
- Author
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Brandily C, LeCuff N, Donval JP, Guyader V, De Prunele A, Cathalot C, Croguennec C, Caprais JC, and Ruffine L
- Subjects
- Carbon Isotopes analysis, Chromatography, Gas, Gases, Spectrum Analysis, Expeditions, Natural Gas
- Abstract
Carbon dioxide (CO
2 ) and methane (CH4 ) are two climate-sensitive components of gases migrating within sediments and emitted into the water column on continental margins. They are involved in several key biogeochemical processes entering into the global carbon cycle. In order to perform onboard measurements of both the molecular and stable carbon isotope ratios (δ13 C) of CH4 and CO2 of natural gases during oceanic cruises, we have developed a novel approach coupling gas chromatography (GC) with cavity ring-down spectroscopy (CRDS). The coupled devices are connected to a small sample isotope module (SSIM) to form a system called GC-SSIM-CRDS. Small volumes of natural gas samples (<1 mL) are injected into the GC using a headspace autosampler or a gas-tight syringe to separate the chemical components using a Shincarbon ST packed column and for molecular quantification by thermal conductivity detection (TCD). Subsequently, CO2 from the sample is trapped in a 7 mL loop at 32 °C before being transferred to the CRDS analyzer for sequential determination of the stable carbon isotope ratios of CH4 and CO2 in 24 min. The loop is an open column (without stationary phase). This approach does not require the use of adsorbents or cooling for the trapping step. Optimization of the separation step prior to analysis was focused on the influence of two key separation factors 1) the flow of the carrier gas and 2) the temperature of the oven. Our analytical system and the measurement protocol were validated on samples collected from gas seeps in the Sea of Marmara (Turkey). Our results show that the GC-SSIM-CRDS system provides a reliable determination of the molecular identification of CH4 and CO2 in complex natural gases, followed by the stable carbon isotope ratios of methane and carbon dioxide., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2021 Elsevier B.V. All rights reserved.)- Published
- 2021
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24. Freshwater lake to salt-water sea causing widespread hydrate dissociation in the Black Sea.
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Riboulot V, Ker S, Sultan N, Thomas Y, Marsset B, Scalabrin C, Ruffine L, Boulart C, and Ion G
- Abstract
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 stability zone in a region covering at least 2800 square kilometers which focus seepages at the observed sites. We suspect this process to occur in other world regions (e.g., Caspian Sea, Sea of Marmara).
- Published
- 2018
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25. New insights into the transport processes controlling the sulfate-methane-transition-zone near methane vents.
- Author
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Sultan N, Garziglia S, and Ruffine L
- Abstract
Over the past years, several studies have raised concerns about the possible interactions between methane hydrate decomposition and external change. To carry out such an investigation, it is essential to characterize the baseline dynamics of gas hydrate systems related to natural geological and sedimentary processes. This is usually treated through the analysis of sulfate-reduction coupled to anaerobic oxidation of methane (AOM). Here, we model sulfate reduction coupled with AOM as a two-dimensional (2D) problem including, advective and diffusive transport. This is applied to a case study from a deep-water site off Nigeria's coast where lateral methane advection through turbidite layers was suspected. We show by analyzing the acquired data in combination with computational modeling that a two-dimensional approach is able to accurately describe the recent past dynamics of such a complex natural system. Our results show that the sulfate-methane-transition-zone (SMTZ) is not a vertical barrier for dissolved sulfate and methane. We also show that such a modeling is able to assess short timescale variations in the order of decades to centuries.
- Published
- 2016
- Full Text
- View/download PDF
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