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Registros recuperados: 6
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A moderate melting model for the Voring margin (Norway) based on structural observations and a thermo-kinematical modelling: Implication for the meaning of the lower crustal bodies ArchiMer
Gernigon, Laurent; Lucazeau, Francis; Brigaud, Frederic; Ringenbach, Jean-claude; Planke, Sverre; Le Gall, Bernard.
High P-wave velocities (7.1-7.8 km/s) lower crustal bodies (LCBs) imaged along volcanic margins are commonly interpreted as plume and break-up-related thick mafic underplating. This interpretation is partly challenged in this paper based on new seismic observations and modelling of the outer Voring Basin (Norway). An exceptional strong amplitude reflection, the T Reflection, is particularly well defined below the North Gjallar Ridge (NGR) between 7 and 8 s TWT. The T Reflection is located near the volcanic lava flows emplaced during the NE Atlantic breakup (similar to 55-54 Ma ago) and coincides with the top of the LCB, forming a mid-crustal dome. Based on structural and temporal relationships, we show that the dome clearly influences the structural...
Tipo: Text Palavras-chave: Mantle plume; Norwegian margin; Underplating; Breakup; Modelling; Rifting; Volcanic margins.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1042.pdf
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Forêts de laminaires à Molène : approches multi-échelles des fonds rocheux de l’archipel ArchiMer
Ehrhold, Axel; Bajjouk, Touria; Cordier, Celine; Le Nilliot, Philippe; Hamdi, Anouar; Drussel, Benjamin; Guerin, Charline; Le Gall, Bernard; Populus, Jacques.
Tipo: Text Palavras-chave: Habitat; Laminaires; Systèmes acoustiques; Lidar; Géomorphologie; MNT.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00281/39230/37790.pdf
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Imagerie LiDAR du socle hercynien immergé de l’archipel de Molène, Ouest Massif Armoricain. Evidence d’un duplex ductile décrochant et d’intrusions syntectoniques ArchiMer
Le Gall, Bernard; Authemayou, Christine; Ehrhold, Axel.
Tipo: Text
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00363/47439/47464.pdf
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LiDAR offshore structural mapping and U/Pb zircon/monazite dating of Variscan strain in the Leon metamorphic domain, NW Brittany ArchiMer
Le Gall, Bernard; Authemayou, Christine; Ehrhold, Axel; Paquette, Jean-louis; Bussien, Denise; Chazot, Gilles; Aouizerat, Arthur; Pastol, Yves.
An exceptional structural picture of the immerged Variscan basement, offshore the Leon metamorphic domain, is supplied by high-resolution LiDAR and echosounder data recorded in the Molene archipelago, western Brittany (France). Various types of fabrics are identified and, from in situ rock sample analyses further combined with field structural data, are interpreted on a lineament trajectory map as the trace of magmatic and tectonic structures. Our onshore/offshore study leads us to propose a two-phase kinematic model that emphasizes the role of a strike-slip duplex in an EW-trending relay zone linking the North Armorican and Pierres Noires ductile shear zones (NASZ, PNSZ). Dextral shearing occurred within a transtensional setting, synchronously with...
Tipo: Text Palavras-chave: Armorican massif; Leon metamorphic domain; Offshore structural mapping; LiDAR records; Dextral ductile shearing; U/Pb zircon/monazite dating.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00194/30490/28895.pdf
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Tectonique extensive tertiaire à l’extrémité occidentale du Massif armoricain. Les blocs tiltés d’Ouessant et de Molène ArchiMer
Le Gall, Bernard; Ehrhold, Axel; Authemayou, Christine.
Tipo: Text
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00363/47441/47468.pdf
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Young rift kinematics in the Tadjoura rift, western Gulf of Aden, Republic of Djibouti ArchiMer
Daoud, Mohamed A.; Le Gall, Bernard; Maury, Rene; Rolet, Joel; Huchon, Philippe; Guillou, Herve.
The Tadjoura rift forms the westernmost edge of the westerly propagating Sheba ridge, between Arabia and Somalia, as it enters into the Afar depression. From structural and remote sensing data sets, the Tadjoura rift is interpreted as an asymmetrical south facing half-graben, about 40 km wide, dominated by a large boundary fault zone to the north. It is partially filled up by the 1-3 Myr old Gulf Basalts which onlapped the older Somali Basalts along its shallower southern flexural margin. The major and trace element analysis of 78 young onshore lavas allows us to distinguish and map four distinct basaltic types, namely the Gulf, Somali, Goumarre, and Hayyabley Basalts. These results, together with radiometric age data, lead us to propose a revised...
Tipo: Text
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00200/31103/29502.pdf
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