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| Registros recuperados: 11 | |
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| Burnard, P.; Bourlange, S.; Henry, Pierre; Geli, Louis; Tryon, M. D.; Natal'In, B.; Sengor, A. M. C.; Ozeren, M. S.; Cagatay, M. N.. |
| Fluids venting from the submarine portion of the Marmara Main Fault (part of the North Anatolian Fault system, Turkey) were sampled in Ti bottles deployed by submersible. The fluids consist of mixtures of fault derived gases, fault related cold seep fluids, and ambient seawater; these components can readily be distinguished using the isotopes of He and the He/Ne ratios. He-3/He-4 ratios range between 0.03 +/- 0.1 and 4.9 +/- 0.4 Ra, indicating that both crustal and mantle derived sources of helium are sampled by the fault. The dominant gas in all the samples analyzed is methane with the abundance of CO2 below detection (<= 2%) in the mantle rich (high He-3/He-4) fluids. This is in contrast to nearly all mantle derived fluids where the C species are... |
| Tipo: Text |
Palavras-chave: Fluids; Gas emission; Helium; Marmara Sea; North Anatolian Fault. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00098/20954/18576.pdf |
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| Ritt, Benedicte; Sarrazin, Jozee; Caprais, Jean-claude; Noel, Philippe; Gauthier, Olivier; Pierre, Catherine; Henry, Pierre; Desbruyeres, Daniel. |
| A brackish-water cold seep on the North Anatolian Fault (NAF) in the Marmara Sea was investigated with the Nautile submersible during the MarNaut cruise in 2007. This active zone has already been surveyed and revealed evidence of active seeping on the seafloor, such as bubble emissions, patches of reduced sediments, microbial mats and authigenic carbonate crusts. MarNaut was the first opportunity to sample benthic communities in the three most common microhabitats (bioturbated and reduced sediments, carbonate crust) and to examine their relationships with environmental conditions. To do so, faunal communities were sampled and chemical measurements were taken close to the organisms. According to diversity indices, the bioturbated microhabitat exhibited the... |
| Tipo: Text |
Palavras-chave: Marmara Sea; Cold seep; Benthic fauna; Biological diversity; Environmental conditions; Chemosynthetic. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00014/12506/9528.pdf |
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| Geli, Louis; Henry, P; Zitter, T; Dupre, Stephanie; Tryon, M; Cagatay, M; De Lepinay, B; Le Pichon, X; Sengor, A; Gorur, N; Natalin, B; Ucarkus, G; Oezeren, S; Volker, D; Gasperini, L; Burnard, P; Bourlange, S. |
| The submerged section of the North Anatolian fault within the Marmara Sea was investigated using acoustic techniques and submersible dives. Most gas emissions in the water column were found near the surface expression of known active faults. Gas emissions are unevenly distributed. The linear fault segment crossing the Central High and forming a seismic gap - as it has not ruptured since 1766, based on historical seismicity [Ambraseys, N.N., and Jackson, J.A., (2000), Seismicity of the Sea of Marmara (Turkey) since 1500, Geophys. J. Int., 141, (3), F1-F6. (doi:10.1046/j.1365-246x.2000.00137.x: Ambraseys, N., (2002), The seismic activity of the Marmara Region over the last 2000 years, Bull. Seism. Soc. Am., 92, 1-18; Parson, T., (2004), Recalculated... |
| Tipo: Text |
Palavras-chave: North Anatolian Fault; Marmara Sea; Gas emission; Fluids; Seismicity. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4681.pdf |
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| Ritt, Benedicte; Duperron, Sebastien; Lorion, Julien; Lazar, Cassandre; Sarrazin, Jozee. |
| Recently, small Idas-like mussels have been discovered living on carbonate crusts associated with cold-seeps in the Marmara Sea. These mussels, here referred to as Idas-like nov. sp., differ morphologically and genetically from another species identified as Idas aff. modiolaeformis, living in the same type of ecosystem in the Nile Deep-Sea Fan (eastern Mediterranean Sea). A phylogenetic analysis confirms the distinction between the two species, which belong to highly divergent lineages. Carbon stable isotope values, as well as the detection of thiotroph-related bacteria in the gill tissue, support the presence of a symbiotic, thiotroph-derived nutrition. In contrast, Idas aff. modiolaeformis displays six different types of symbionts. Finally our... |
| Tipo: Text |
Palavras-chave: Mytilidae; Idas-like; Cold-seeps; Marmara Sea; Phylogeny; Symbiosis; Stable isotopes. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00098/20915/19672.pdf |
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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.; Ruffine, Livio. |
| 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.... |
| Tipo: Text |
Palavras-chave: Marmara Sea; Tekirdag Basin; Methane; Authigenic seep-carbonate; Sulfate reduction; Anaerobic oxidation of methane; Stromatolitic structure; Stable isotopes; Lipid biomarkers. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00417/52857/53764.pdf |
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| Sakic, P.; Piete, Helene; Ballu, V.; Royer, J. -y.; Kopp, H.; Lange, D.; Petersen, F.; Ozeren, M. S.; Ergintav, S.; Geli, Louis; Henry, P.; Deschamps, Anne. |
| The submarine Istanbul-Silivri fault segment, within 15 km of Istanbul, is the only portion of the North Anatolian Fault that has not ruptured in the last 250 years. We report first results of a seafloor acoustic ranging experiment to quantify current horizontal deformation along this segment and assess whether the segment is creeping aseismically or accumulating stress to be released in a future event. Ten transponders were installed to monitor length variations along 15 baselines. A joint least squares inversion for across-fault baseline changes, accounting for sound speed drift at each transponder, precludes fault displacement rates larger than a few millimeters per year during the 6 month observation period. Forward modeling shows that the data better... |
| Tipo: Text |
Palavras-chave: Seafloor geodesy; North Anatolian Fault; Marmara Sea; Acoustic ranging. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00344/45513/45067.pdf |
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| Eris, K. K.; Ryan, W. B. F.; Cagatay, M. N.; Lericolais, Gilles; Sancar, U.; Bard, E.; Menot, G.. |
| In their comment Hiscott and co-authors adhere rigidly to ages and sources for sedimentary units in the subsurface of the Marmara shelf that they have previously reported in their publications from 2002 through 2007. This adherence is in spite of a superior age-depth model from our 13 m-long sediment core that penetrated deeply into the deposits under consideration and in disregard to the results of subsequent more-detailed and full-coverage mapping of the region under scrutiny. The age revisions are dismissed by the authors of the comment as representing sediments severely disturbed during coring. We rebut this criticism. The Bosporus source attributed by them to the sedimentary units sampled and dated by us appears to be driven by their conception that... |
| Tipo: Text |
Palavras-chave: Spillway; Black Sea; Marmara Sea; Dardanelles; Bosporus. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-5915.pdf |
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| Eris, K; Ryan, W; Cagatay, M; Sancar, U; Lericolais, Gilles; Menot, G; Bard, E. |
| High-resolution reflection seismic profiles with core analyses of sedimentary sequence near the Sea of Marmara (SoM) entrance to the Strait of İstanbul (SoI, Bosphorus) provide detailed record of sealevel changes since the Late Glacial Maximum (LGM). The sequence is deposited over the LGM erosional surface at a maximum depth of -105 m. It includes seven seismic units that can be confidently correlated with 14C-dated sedimentary units in the cores. Unit 6 represents levee deposits of the paleo-SoI channel that was deposited by a Black Sea outflow during 11.2-10.6 kyr BP. The reflection surfaces at base of Unit 5 and 4 correspond to wave-cut terraces at -71and -63 m, respectively, and are estimated to be 10.6 and 9.8 kyr BP. The seismic Unit 2, overlaying a... |
| Tipo: Text |
Palavras-chave: Sapropel; Delta; Marmara Sea; Holocene; Sea level; Seismic stratigraphy. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3574.pdf |
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| Registros recuperados: 11 | |
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