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Registros recuperados: 13
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Comments on "Shallow gas off the Rhone prodelta, Gulf of Lions" by Garcia-Garcia et al. (2006) Marine Geology 234 (215-231) - Reply ArchiMer
Garcia Garcia, A; Orange, D; Lorenson, T; Radakovitch, O; Tesi, T; Miserocchi, S; Berne, Serge; Friend, P; Nittrouer, C; Normand, Alain.
We really appreciate the interest and comments regarding our manuscript. We hope we address all the lingering issues in this reply. This also gives us the opportunity of publishing an update on our dataset that will complete the original manuscript (see Table 1). We have followed the author pattern in our answers: I-Gas sampling procedure, 2-Reported gas concentrations results, 3-General remarks, 4-Conclusions. (c) 2007 Elsevier B.V. All rights reserved.
Tipo: Text Palavras-chave: Gulf of Lions; Rhone prodelta; Flood deposits; Biogenic methane; Shallow gas.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3846.pdf
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Deep-penetration heat flow probes raise questions about interpretations from shorter probes ArchiMer
Géli, Louis; Turon, J.-l.; Aslanian, Daniel; Balut, Y.; Beuzart, Paul; Cochran, J.; Francheteau, J.; Harmegnies, Francois; Landuré, Jean-yves; Le Suavé, Raymond; Mazaud, A.; Michel, E.; Normand, Alain; Pichon, Jack; Vlastelic, Ivan.
Tipo: Text
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00288/39943/38491.pdf
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First results of a geophysical survey on the northern flank of the Storegga. slides (Norway). ArchiMer
Nouze, Herve; Contrucci, Isabelle; Foucher, Jean-paul; Marsset, Bruno; Thomas, Yannick; Thereau, Estelle; Normand, Alain; Le Drezen, Eliane; Didailler, Stephane; Regnault, Jean-pierre; Le Conte, Sandie; Guidart, Stéphanie; Lekens, Win; Dean, Simon; Throo, Alexandre.
The Storegga slides, off Norway, are among the largest submarine slides ever known on a continental slope. The HYDRATECH cruise on N/O Le Suro (i) over capt aimed at a high-resolution survey of an area at the northern boundary of the slides. This survey images in great detail the bottom simulating reflector (BSR) extent and properties, the various fluid escape structures and the sediment deformations. The combination and the quality of the data help to understand the still poorly constrained relationships between fluid escapes, gas hydrates and slope stability in the survey area.
Tipo: Text Palavras-chave: Slope stability; Fluid escapes; Gas hydrates; Storegga.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-511.pdf
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Geological context and vents morphology of the ultramafic-hosted Ashadze hydrothermal areas (Mid-Atlantic Ridge 13 degrees N) ArchiMer
Ondreas, Helene; Cannat, Mathilde; Fouquet, Yves; Normand, Alain.
Recent ROV dives and high-resolution bathymetric data acquired over the Ashadze fields on the Mid-Atlantic Ridge (13 degrees N) allow us to derive constraints on the regional and local geological setting of ultramafic-hosted hydrothermal fields. The active vent fields of Ashadze hydrothermal fields are located in the western axial valley wall, downslope from the termination of a prominent corrugated surface and in a transitional domain with respect to ridge segmentation. The study of the shipboard and ROV bathymetry shows that decameter (100 m by 60 m) to kilometer-scaled rockslides shape the axial valley wall slopes in this region. The Ashadze 1 vent field occurs on a coherent granular landslide rock mass that is elongated in an E-W direction. The Ashadze...
Tipo: Text Palavras-chave: Ashadze; Mid-Atlantic Ridge; Hydrothermal activity; Hydrothermal explosion crater; Ultramafic rocks.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00111/22223/19895.pdf
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High-resolution bathymetry reveals contrasting landslide activity shaping the walls of the Mid-Atlantic Ridge axial valley ArchiMer
Cannat, Mathilde; Mangeney, Anne; Ondreas, Helene; Fouquet, Yves; Normand, Alain.
Axial valleys are found along most slow-spreading mid-ocean ridges and are one of the most prominent topographic features on Earth. In this paper, we present the first deep-tow swath bathymetry for the axial valley walls of the Mid-Atlantic Ridge. These data allow us to analyze axial valley wall morphology with a very high resolution (0.5 to 1 m compared to 50 m for shipboard multibeam bathymetry), revealing the role played by landslides. Slow-spreading ridge axial valleys also commonly expose mantle-derived serpentinized peridotites in the footwalls of large offset normal faults (detachments). In our map of the Ashadze area (lat. 13 degrees N), ultramafic outcrops have an average slope of 18 degrees and behave as sliding deformable rock masses, with...
Tipo: Text Palavras-chave: Landslides; Detachment faults; Basalts; Mid-ocean ridges; Serpentinized peridotites.
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00284/39516/38004.pdf
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L'énigmatique Fosse Centrale de la Manche : une approche de sa morphologie et de son remplissage par géophysique haute résolution ArchiMer
Lericolais, Gilles; Auffret, J.p.; Bourillet, Jean-francois; Berne, Serge; Guennoc, Pol; Le Drezen, Eliane; Normand, Alain; Guillocheau, Francois.
New high resolution geophysical results from EM1000 swath-bathymetry system and Very High Resolution reflection seismic data are presented. A Neogene tectonical origin of the Hurd Deep and the interplay of erosion, sedimentation during the last glacial, inter-glacial periods are here argued by interpretation of these results in term of geomorphology and sequence stratigraphy.
Tipo: Text
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00071/18205/15772.pdf
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Marine Atlas of the Sea of Marmara (Turkey). Data collected on board R. V Le Suroît, September 2000 ArchiMer
Rangin, Claude; Demirbag, Emin; Imren, Caner; Crusson, Alban; Normand, Alain; Le Drezen, Eliane; Le Bot, André.
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Ano: 2001 URL: http://archimer.ifremer.fr/doc/00279/39006/37571.pdf
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Morphological changes and sedimentary processes induced by the December 2003 flood event at the present mouth of the Grand Rhone River (southern France) ArchiMer
Maillet, Grégoire M.; Vella, Claude; Berne, Serge; Friend, Patrick L.; Amos, Carl L.; Fleury, Thomas J.; Normand, Alain.
The study, which is based on repetitive bathymetric surveys, assesses changes and effects of one of the most important floods recorded in the Rhone Delta area: bottom morphology and sediment distribution in the Rhone outlet after the December 2003 flood are discussed by comparison between Digital Terrain maps (DTMs) of November 2003 and January 2004. The post-flood morphology shows that the whole of the system is active, mainly in the east. The channel of the Rhbne has been hollowed out on the left bank by more than 5 m, the eastern coast of the mouth has retreated 400 m, the mouth-bar has prograded 200 m and the slope of the delta front has increased by 0.19. The overlay of pre- and post-flood DTMs makes it possible to estimate the total volume deposited...
Tipo: Text Palavras-chave: Bathymetric maps; Sedimentation rate; Flood processes; Prodelta; Delta front; Mouth bar.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2304.pdf
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Recent volcanic events and the distribution of hydrothermal venting at the Lucky Strike hydrothermal field, Mid-Atlantic Ridge ArchiMer
Ondreas, Helene; Cannat, M.; Fouquet, Yves; Normand, Alain; Sarradin, Pierre-marie; Sarrazin, Jozee.
We present new high-resolution bathymetry and backscatter data acquired in 2006 with the ROV Victor 6000 over the Lucky Strike hydrothermal field, Mid-Atlantic Ridge. As long-term monitoring of the Lucky Strike area (MoMAR project) is being implemented, these new high-resolution data offer an unprecedented view of the distribution of hydrothermal edifices, eruptive facies, and small-scale tectonic features in the Lucky Strike vent field. We show that vents located in the NW and NE correspond with wide expanses of lumpy seafloor which we interpret as primarily made of broken chimneys and sulfide edifices. They are found above scarps with relief > 50 m or on associated mass wasting deposits. By contrast, the SE and SW vents correspond with small expanses...
Tipo: Text Palavras-chave: Hydrothermalism; Lava lake; Lucky Strike; Mid Atlantic Ridge.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6161.pdf
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Shallow gas off the Rhone prodelta, Gulf of Lions ArchiMer
Garcia Garcia, Ana; Orange, D; Lorenson, T; Radakovitch, O; Tesi, T.; Miserocchi, S; Berne, Serge; Friend, P.l.; Nittrouer, C; Normand, Alain.
Sediment cores acquired in 2004 off the Rhone prodelta show consistent anomalous methane concentrations of up to 87,440 ppm. Methane compositional and isotopic data support a biogenic origin, although there are a few sites that show strongly depleted delta C-13 values (-53%o PDB) suggesting a mixed source for the gas (biogenic and thermogenic). Anomalous methane concentrations (samples with more than 90 ppm) are discussed and integrated with organic carbon data, sedimentary rates and ADCP profiles. Highest gas concentrations were found directly off the river mouth (20-40 m water depth) and where the IFREMER models point to the thickest accumulation (> 2 m) in response to the Rhone flood event. In areas unaffected by the high flux of organic matter and...
Tipo: Text Palavras-chave: Gulf of Lions; Rhone prodelta; Flood deposits; Biogenic methane; Shallow gas.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2396.pdf
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Tectonic significance of the Taitung Canyon, Huatung Basin, east of Taiwan (vol 25, pg 95, 2004) ArchiMer
Sibuet, Jean-claude; Hsu, Shu-kun; Normand, Alain.
Since the beginning of formation of Proto-Taiwan, the subducting Philippine (PH) Sea plate has moved continuously through time in the N307° direction with respect to Eurasia (EU), tearing the EU plate. The subducting EU plate includes a continental part in the north and an oceanic part in the south. The boundary B between these two domains corresponds to the eastern prolongation of the northeastern South China Sea ocean-continent transition zone. In the Huatung Basin (east of Taiwan), the Taitung Canyon is N065° oriented and is close and parallel to B. Seismic profiles show that the southern flank of the canyon corresponds to a fault with a normal component of a few tens of meters in the sediments and possible dextral shearing. Several crustal earthquakes...
Tipo: Text Palavras-chave: Underlying slab deformation along trasition zone; Slip fault; Right lateral strike; Taitung Canyon.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3035.pdf
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The Danube submarine canyon (Black Sea): morphology and sedimentary processes ArchiMer
Popescu, Irina; Lericolais, Gilles; Panin, Nicolae; Normand, Alain; Dinu, Cornel; Le Drezen, Eliane.
The Danube Canyon is a large shelf-indenting canyon that has developed seaward of the late Pleistocene paleo-Danube valley. Mechanisms of canyon evolution and factors that controlled it are revealed by analyzing the morphology and the sedimentary structure of the canyon, as well as the main features of the continental margin around the canyon. This is based on investigation by swath bathymetry in the canyon area combined with different types of seismic data. The canyon is a major erosional trough with a flat bottom cut by an entrenched axial thalweg. The thalweg path varies from highly meandering to fairly straight in relation to the local gradient. Segments of the canyon are characterized by specific morphology, orientation and gradient along the axial...
Tipo: Text Palavras-chave: Gas; Wave cut terrace; Buried fluvial channels; Headward erosion; Submarine canyon; Black Sea.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-476.pdf
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Understanding continent-ocean sediment transfer ArchiMer
Mulder, Thierry; Cirac, Pierre; Gaudin, Mathieu; Bourillet, Jean-francois; Trainer, J.; Normand, Alain; Weber, O.; Griboulard, R.; Jouanneau, Jean-marie; Anschutz, Pierre; Jorissen, Frans.
Submarine canyons are narrow but deep submarine valleys that extend for hundreds of meters. They represent the most impressive structures that shape the present morphology of passive continental margins. They can occur off the mouth of rivers: the Tagus, Zaire, Amazon, and Orinoco in the Atlantic; the Indus in the Indian Ocean; and the Var, Rhone, and Ebro in the Mediterranean. Some are at times disconnected from any stream mouth such as the Nazare canyon, off Portugal, despite the fact that it is close to the coast. Some were connected to a river mouth during lowstands of sea level, such as the Wilmington canyon in the northwest Atlantic, or the Blackmud canyon in the northeast Atlantic.
Tipo: Text
Ano: 2004 URL: http://archimer.ifremer.fr/doc/00071/18201/15769.pdf
Registros recuperados: 13
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