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	Provedor de dados ArchiMer (8) Autor Sibuet, Jean-claude (3) Aslanian, Daniel (2) Hall, Jeremy (2) Klingelhoefer, Frauke (2) Moulin, Maryline (2) Schnurle, Philippe (2) Afilhado, A. (1) Agoudjil, A. (1) Al-lazki, A. (1) Alves, D. (1) Badsi, M. (1) Baltzer, Agnes (1) Benabdellouahed, Massinissa (1) Benaissa, Z. (1) Bracene, R. (1) D'Acremont, E. (1) Deemer, S. (1) Deemer, Sharon (1) Djelit, H. (1) Ebinger, C. (1) Mais... Palavra-chave Continental margins: divergent (8) Crustal structure (6) Atlantic Ocean (4) Controlled source seismology (4) Continental tectonics: extensional (3) Africa (2) South America (2) Submarine tectonics and volcanism (2) Continental margins: transform (1) Hotspots (1) Indian Ocean (1) Mid-ocean ridge processes (1) Plate motions (1) Seismic tomography (1) Submarine tectonics and Volcanism (1) Tomography (1) Mais... Tipo do documento Text (8) Ano 2015 (1) 2014 (1) 2011 (1) 2010 (3) 2009 (2) País France (8) Idioma Inglês (8)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 8 Primeira ... 1 ... Última Seismic evidence for plume-derived volcanism during formation of the continental margin in southern Davis Strait and northern Labrador Sea ArchiMer Gerlings, Joanna; Funck, Thomas; Jackson, H. Ruth; Louden, Keith E.; Klingerhoefer, Frauke. The crustal structure in the southern Davis Strait and the adjacent ocean-continent transition zone in NE Labrador Sea was determined along a 185-km-long refraction/wide-angle reflection seismic transect to study the impact of the Iceland mantle plume to this region. A P-wave velocity model was developed from forward and inverse modelling of dense airgun shots recorded by ocean bottom seismographs. A coincident industry multichannel reflection seismic profile was used to guide the modelling as reflectivity could be identified down to Moho. The model displays a marked lateral change of velocity structure. The sedimentary cover (velocities 1.8-3.9 km s(-1)) is up to 4 km thick in the north and thins to 1 km in the south. The segment of the line within... Tipo: Text Palavras-chave: Crustal structure; Hotspots; Continental margins: transform; Continental margins: divergent. Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6848.pdf Structure and development of the southeast Newfoundland continental passive margin: derived from SCREECH Transect 3 ArchiMer Deemer, Sharon; Hall, Jeremy; Solvason, Krista; Lau, K. W. Helen; Louden, Keith; Srivastava, Shiri; Sibuet, Jean-claude. P>New seismic reflection data from the Grand Banks of Newfoundland and the Newfoundland Basin add to the growing knowledge of the composition, structure and history of this non-volcanic margin. Geophysical imaging is now approaching the extent of that done previously on the conjugate margin along Iberia, providing a valuable database for the development of rifting models. Two parallel profiles over the shelf platform image deep crustal fabric representing Precambrian or possibly Appalachian deformation as well as Mesozoic extension. Progressively more intense extension of continental crust is imaged oceanwards without the highly reflective detachments frequently seen on profiles off Galicia. A landward-dipping event 'L' is imaged sporadically and... Tipo: Text Palavras-chave: Atlantic Ocean; Submarine tectonics and Volcanism; Continental margins: divergent; Crustal structure. Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6919.pdf The crustal structure of the north-eastern Gulf of Aden continental margin: insights from wide-angle seismic data ArchiMer Watremez, Louise; Leroy, Sylvie; Rouzo, Stephane; D'Acremont, E.; Unternehr, P.; Ebinger, C.; Lucazeau, F.; Al-lazki, A.. P>The wide-angle seismic (WAS) and gravity data of the Encens survey allow us to determine the deep crustal structure of the north-eastern Gulf of Aden non-volcanic passive margin. The Gulf of Aden is a young oceanic basin that began to open at least 17.6 Ma ago. Its current geometry shows first- and second-order segmentation: our study focusses on the Ashawq-Salalah second-order segment, between Alula-Fartak and Socotra-Hadbeen fracture zones. Modelling of the WAS and gravity data (three profiles across and three along the margin) gives insights into the first- and second-order structures. (1) Continental thinning is abrupt (15-20 km thinning across 50-100 km distance). It is accommodated by several tilted blocks. (2) The ocean-continent transition... Tipo: Text Palavras-chave: Controlled source seismology; Continental margins: divergent; Crustal structure; Indian Ocean. Ano: 2011 URL: http://archimer.ifremer.fr/doc/00200/31102/29507.pdf Imaging proto-oceanic crust off the Brazilian Continental Margin ArchiMer Klingelhoefer, Frauke; Evain, Mikael; Afilhado, A.; Rigoti, Caesar; Loureiro, Afonso; Alves, D.; Lepretre, Angelique; Moulin, Maryline; Schnurle, Philippe; Benabdellouahed, Massinissa; Baltzer, Agnes; Rabineau, Marina; Feld, Aurelie; Viana, A.; Aslanian, Daniel. During the Sanba (Santos basin seismic transect) experiment in 2010–2011, a 380-km-long combined wide-angle and reflection seismic profile has been acquired using 30 ocean-bottom seismometers, a 4.5 km seismic streamer and a 8900 in.3 airgun array. The Sanba 3 profile crosses the southern flank of the Sao Paulo Plateau, the Sao Paulo Ridge and the easternmost Santos Basin in an east–west direction. Its eastern end is located on undisturbed oceanic crust. Tomographic and forward modelling of the wide-angle seismic data reveals that the sedimentary thickness is variable with only 1–2 km on top of the ridge and thickening to 4–5 km in the basin. Crustal thickness at the ridge is about 18 km and the relative layer thickness and velocity gradients indicate a... Tipo: Text Palavras-chave: Controlled source seismology; Seismic tomography; Mid-ocean ridge processes; Continental margins: divergent; Continental tectonics: extensional; Crustal structure; South America. Ano: 2015 URL: http://archimer.ifremer.fr/doc/00242/35296/33826.pdf Comment on 'A new scheme for the opening of the South Atlantic Ocean and the dissection of an Aptian salt basin' by Trond H. Torsvik, Sonia Rousse, Cinthia Labails and Mark A. Smethurst ArchiMer Aslanian, Daniel; Moulin, Maryline. P>Torsvik et al. recently presented a revised model for the opening of the South Atlantic Ocean. According to these authors, this new plate tectonic model is internally consistent and consistent with globally balanced plate motion solutions and takes into account realistic intraplate deformation. However, this model shows a number of kinematic and geological problems that we underline here, together with some comparisons with the new kinematic model recently proposed by Moulin et al. Tipo: Text Palavras-chave: Plate motions; Continental margins: divergent; Africa; Atlantic Ocean; South America. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00014/12504/9878.pdf Structure and rifting evolution of the northern Newfoundland Basin from Erable multichannel seismic reflection profiles across the southeastern margin of Flemish Cap ArchiMer Welford, J. K.; Smith, J. A.; Hall, J.; Deemer, S.; Srivastava, S. P.; Sibuet, Jean-claude. We present the results from processing and interpreting five lines from the 1992 Erable multichannel seismic reflection experiment extending from the southeastern margin of Flemish Cap into the northern Newfoundland Basin. These profiles reveal significant along strike variations in the rifting styles experienced by Flemish Cap. In the southwest, a 100-km-wide transition zone is identified between thinned continental crust and thin oceanic crust. Similar to the conjugate Galicia Bank and Iberian margins, this transition zone contains a section of deep basement adjacent to a series of shallower ridges and is interpreted as exhumed serpentinized mantle. Along strike towards the northeast, this transition zone pinches out completely within 100 km and is... Tipo: Text Palavras-chave: Controlled source seismology; Submarine tectonics and volcanism; Continental margins: divergent; Continental tectonics: extensional; Crustal structure; Atlantic Ocean. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00001/11202/7876.pdf Seismic imaging of the eastern Algerian margin off Jijel: integrating wide-angle seismic modelling and multichannel seismic pre-stack depth migration ArchiMer Mihoubi, A.; Schnurle, Philippe; Benaissa, Z.; Badsi, M.; Bracene, R.; Djelit, H.; Geli, Louis; Sage, F.; Agoudjil, A.; Klingelhoefer, Frauke. This study presents the results of a deep seismic survey across the north Algerian margin, based on the combination of 2-D multichannel and wide-angle seismic data simultaneously recorded by 41 ocean bottom seismometers deployed along a north-south line extending 180 km off Jijel into the Algerian offshore basin, and 25 land stations deployed along a 100-km-long line, cutting through the Lesser Kabylia and the Tellian thrust-belt. The final model obtained using forward modelling of the wide-angle data and pre-stack depth migration of the seismic reflection data provides an unprecedented view of the sedimentary and crustal structure of the margin. The sedimentary layers in the Algerian basin are 3.75 km thick to the north and up to 4.5-5 km thick at the... Tipo: Text Palavras-chave: Tomography; Continental margins: divergent; Africa. Ano: 2014 URL: http://archimer.ifremer.fr/doc/00217/32836/32150.pdf Structure across the northeastern margin of Flemish Cap, offshore Newfoundland from Erable multichannel seismic reflection profiles: evidence for a transtensional rifting environment ArchiMer Welford, J. Kim; Hall, Jeremy; Sibuet, Jean-claude; Srivastava, Shiri P.. P>We present the results from processing and interpreting nine multichannel seismic reflection lines collected during the 1992 Erable experiment over the northeastern margin of Flemish Cap offshore Newfoundland. These lines, combined into five cross-sections, provide increased seismic coverage over this lightly probed section of the margin and reveal tectonically significant along-strike variations in the degree and compartmentalization of crustal thinning. Similar to the southeastern margins of Flemish Cap and the Grand Banks, a transitional zone of exhumed serpentinized mantle is interpreted between thinned continental and oceanic crust. The 25 km wide transitional zone bears similarities to the 120 km wide transitional zone interpreted as exhumed... Tipo: Text Palavras-chave: Controlled source seismology; Continental margins: divergent; Continental tectonics: extensional; Submarine tectonics and volcanism; Crustal structure; Atlantic Ocean. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00017/12776/11313.pdf Registros recuperados: 8 Primeira ... 1 ... Última

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