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Registros recuperados: 24
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Ambient noise Rayleigh wave tomography across the Madagascar island ArchiMer
Adimah, N I; Padhy, S.
The unusual complex lithospheric structure of Madagascar is a product of a number of important geological events, including: the Pan-African Orogeny, episodes of Late Cenozoic intraplate volcanism and several phases of deformation and metamorphism. Despite this rich history, its detailed crustal structure remains largely underexplored. Here, we take advantage of the recently obtained data set of the RHUM-RUM (Réunion Hotspot and Upper Mantle–Réunions Unterer Mantel) seismological experiment, in addition to previously available data sets to generate the first Rayleigh wave group velocity maps across the entire island at periods between 5 and 30 s using the ambient noise tomography technique. Prior to preliminary data preparation, data from Ocean Bottom...
Tipo: Text Palavras-chave: Seismic tomography; Africa; Crustal structure; Surface waves and free oscillations; Seismic noise..
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00600/71184/69539.pdf
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Contraintes par imagerie sismique pénétrante sur l'évolution d'une marge Cénozoïque réactivée en compression (cas de la marge algérienne, secteur de Tipaza) ArchiMer
Lepretre, Angelique.
The inversion of passive margins appears to be one of the first steps towards the initiation of new subduction zones. This crucial step in plate tectonics nevertheless still raises many questions. The study of margins currently reactivated by compressional tectonics is thus essential to better understand this process. These margins are uncommon, located in different geodynamic settings, and the factors determining their evolution are poorly constrained. The Algerian margin, located in North Africa, is one of handful of modern examples worldwide. The evolution of this margin, rifted during the Miocene, in a back-arc setting, is part ofthe complex puzzle of the western Mediterranean. Since a few million years, the margin has suffered inversion and...
Tipo: Text Palavras-chave: Marge algérienne; Structure crustale; Réactivation en compression; Bassin arrière-arc; Méditerranée Occidentale; Sismique-réflexion marine; Sismique grand-angle; Algerian margin; Crustal structure; Compressional reactivation; Back-arc basin; Western Mediterranean; Marine reflection-seismic profiles; Wide-angle seismic profile.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00498/60955/64358.pdf
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Crustal structure of the basin and ridge system west of New Caledonia (southwest Pacific) from wide-angle and reflection seismic data. ArchiMer
Klingelhoefer, Frauke; Lafoy, Y; Collot, Julien; Cosquer, Emmanuel; Geli, Louis; Nouze, Herve; Vially, R.
[1] During the Zoneco 11 marine geophysical survey (September 2004), two deep reflection seismic profiles recorded by ocean bottom seismometers were acquired in the offshore domain west of New Caledonia. The northern profile crosses the New Caledonia Basin, the Fairway Ridge, the Fairway Basin, and the Lord Howe Rise. The southern profile crosses the Norfolk Rise south of New Caledonia, the New Caledonia Basin, the Fairway Ridge and Basin, and ends at the foot of Lord Howe Rise. On the northern profile the Lord Howe Rise has a crustal thickness of 23 km and exhibits seismic velocities and velocity gradients characteristic of continental crust. The crust thins to 12-15 km in the neighboring Fairway Basin, which is interpreted to be of thinned continental...
Tipo: Text Palavras-chave: Crustal structure; SW Pacific; Wide angle seismic.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3543.pdf
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Crustal structure of the Ionian basin and eastern Sicily margin: results from a wide-angle seismic survey. ArchiMer
Dellong, David; Klingelhoefer, Frauke; Kopp, Heidrun; Graindorge, David; Margheriti, Lucia; Moretti, Milena; Murphy, Shane; Gutscher, Marc-andre.
In the Ionian Sea (Central Mediterranean) the slow convergence between Africa and Eurasia results in the formation of a narrow subduction zone. The nature of the crust of the subducting plate remains debated and could represent the last remnants of the Neo-Tethys ocean. The origin of the Ionian basin is also under discussion, especially concerning the rifting mechanisms as the Malta Escarpment could represent a remnant of this opening. This subduction retreat toward the south-east (motion occurring since the last 35 Ma) but is confined to the narrow Ionian Basin. A major lateral slab tear fault is required to accommodate the slab roll-back. This fault is thought to propagate along the eastern Sicily margin but its precise location remains controversial....
Tipo: Text Palavras-chave: Ionian basin; Crustal structure; Wide-angle seismic; Geodynamic; Mediterranean; Malta Escarpment.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00427/53885/54956.pdf
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Crustal structure of the NE Rockall Trough from wide-angle seismic data modeling - art. no. B11105 ArchiMer
Klingelhoefer, Frauke; Edwards, R; Hobbs, R; England, R.
[1] Two wide-angle seismic lines located in the northern Rockall Trough were acquired in May 2000. One line ( line E) crosses the trough from the continental shelf off Lewis to normal oceanic crust west of Lousy Bank in NW-SE direction. The other line ( line D) intersects with line E, crosses the Wyville-Thomson Ridge in a SW-NE direction and ends in the Faeroe-Shetland Basin. Sonobuoy data and expanding spread profiles acquired in the same area have been remodeled. Analysis of the seismic data using travel times and amplitudes reveals an up to 5 km thick sedimentary basin including an up to 1.5 km thick basaltic layer which is present in most of the trough. Further conclusions of this study are that the Rockall Trough is underlain by highly stretched...
Tipo: Text Palavras-chave: Crustal structure; Wide angle seismics; Rockall Trough.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-881.pdf
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Deep crustal structure across a young passive margin from wide-angle and reflection seismic data (The SARDINIA Experiment) - I. Gulf of Lion's margin ArchiMer
Moulin, Maryline; Klingelhoefer, Frauke; Afilhado, Alexandra; Aslanian, Daniel; Schnurle, Philippe; Nouze, Herve; Rabineau, Marina; Beslier, Marie-odile; Feld, Aurelie.
The conjugate margins system of the Gulf of Lion and West Sardinia (GLWS) represents a unique natural laboratory for addressing fundamental questions about rifting due to its landlocked situation, its youth, its thick sedimentary layers, including prominent palaeo-marker such as the MSC event, and the amount of available data and multidisciplinary studies. The main goals of the SARDINIA experiment, were to (i) investigate the deep structure of the entire system within the two conjugate margins: the Gulf of Lion and West Sardinia, (ii) characterize the nature of the crust, and (iii) define the geometry of the basin and provide important constrains on its genesis. This paper presents the results of P-wave velocity modelling on three coincident near-vertical...
Tipo: Text Palavras-chave: Marge continentale passive; Structure crustale; Réfraction; Golfe du Lion; Croûte océanique; Domaine transitionnel; Continental passive margin; Crustal structure; Wide-angle seismic; Gulf of Lion; Oceanic crust; Transitional domain.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00283/39422/38269.pdf
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Deep structure of the continental margin and basin off Greater Kabylia, Algeria – New insights from wide-angle seismic data modeling and multichannel seismic interpretation ArchiMer
Aidi, Chafik; Beslier, Marie-odile; Yelles-chaouche, Abdel Karim; Klingelhoefer, Frauke; Bracene, Rabah; Galve, Audrey; Bounif, Abdallah; Schenini, Laure; Hamai, Lamine; Schnurle, Philippe; Djellit, Hamou; Sage, Francoise; Charvis, Philippe; Deverchere, Jacques.
During the Algerian-French SPIRAL survey aimed at investigating the deep structure of the Algerian margin and basin, two coincident wide-angle and reflection seismic profiles were acquired in central Algeria, offshore Greater Kabylia, together with gravimetric, bathymetric and magnetic data. This ~260 km-long offshore-onshore profile spans the Balearic basin, the central Algerian margin and the Greater Kabylia block up to the southward limit of the internal zones onshore. Results are obtained from modeling and interpretation of the combined data sets. The Algerian basin offshore Greater Kabylia is floored by a thin oceanic crust (~4 km) with P-wave velocities ranging between 5.2 and 6.8 km/s. In the northern Hannibal High region, the atypical 3-layer...
Tipo: Text Palavras-chave: Mediterranean Sea; Algerian margin; Crustal structure; Tectonic inversion; Post-accretion magmatism; Deep seismics.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00425/53677/54519.pdf
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Deep structure of the Santos Basin-São Paulo Plateau System, SE Brazil ArchiMer
Evain, Mikael; Afilhado, A.; Rigoti, C.; Loureiro, Afonso; Alves, D.; Klingelhoefer, Frauke; Schnurle, Philippe; Feld, Aurelie; Fuck, R.; Soares, J.; De Lima, M. Vinicius; Corela, C.; Matias, L.; Benabdellouahed, Massinissa; Baltzer, Agnes; Rabineau, Marina; Viana, A.; Moulin, Maryline; Aslanian, Daniel.
The structure and nature of the crust underlying the Santos Basin-São Paulo Plateau System (SSPS), in the SE Brazilian margin, are discussed based on five wide-angle seismic profiles acquired during the Santos Basin (SanBa) experiment in 2011. Velocity models allow us to precisely divide the SSPS in six domains from unthinned continental crust (Domain CC) to normal oceanic crust (Domain OC). A seventh domain (Domain D), a triangular shape region in the SE of the SSPS, is discussed by Klingelhoefer et al. (2014). Beneath the continental shelf, a ~100 km wide necking zone (Domain N) is imaged where the continental crust thins abruptly from ~40 km to less than 15 km. Toward the ocean, most of the SSPS (Domains A and C) shows velocity ranges, velocity...
Tipo: Text Palavras-chave: Santos Basin; SAo Paulo Plateau; Crustal structure; Wide-angle seismic.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00276/38715/37232.pdf
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Geological constraints on the evolution of the Angolan margin based on reflection and refraction seismic data (ZaïAngo project) ArchiMer
Moulin, Maryline; Aslanian, Daniel; Olivet, Jean-louis; Contrucci, Isabelle; Matias, Luis; Geli, Louis; Klingelhoefer, Frauke; Nouze, Herve; Rehault, Jean Pierre; Unternehr, Patrick.
Deep penetration multichannel reflection and Ocean Bottom Seismometer wide-angle seismic data from the CongoAngola margin were collected in 2000 during the ZaïAngo cruise. These data help constrain the deep structure of the continental margin, the geometry of the pre-salt sediment layers and the geometry of the Aptian salt layer. Dating the deposition of the salt relative to the chronology of the margin formation is an issue of fundamental importance for reconstructing the evolution of the margin and for the understanding of the crustal thinning processes. The data show that the crust thins abruptly, from a 3040 km thickness to less than 10 km, over a lateral distance of less than 50 km. The transitional domain is a 180-km-wide basin. The pre-salt sediment...
Tipo: Text Palavras-chave: Deep seismic reflection and refraction; Sub salt imaging; Transitional domain; Crustal structure; Non volcanic passive continental margin.
Ano: 2005 URL: https://archimer.ifremer.fr/doc/2005/publication-349.pdf
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Geophysical evidence for a transform margin offshore Western Algeria: a witness of a subduction-transform edge propagator? ArchiMer
Badji, Rabia; Charvis, Philippe; Bracene, Rabah; Galve, Audrey; Badsi, Madjid; Ribodetti, Alessandra; Benaissa, Zahia; Klingelhoefer, Frauke; Medaouri, Mourad; Beslier, Marie-odile.
For the first time, a deep seismic data set acquired in the frame of the Algerian-French SPIRAL program provides new insights regarding the origin of the westernmost Algerian margin and basin. We performed a tomographic inversion of traveltimes along a 100-km-long wide-angle seismic profile shot over 40 ocean bottom seismometers offshore Mostaganem (Northwestern Algeria). The resulting velocity model and multichannel seismic reflection profiles show a thin (3-4 km thick) oceanic crust. The narrow ocean-continent transition (less than 10 km wide) is bounded by vertical faults and surmounted by a narrow almost continuous basin filled with Miocene to Quaternary sediments. This fault system, as well as the faults organized in a negative-flower structure on the...
Tipo: Text Palavras-chave: Seismic tomography; Continental margins: transform; Crustal structure; Africa; Europe..
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00255/36670/35278.pdf
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Imaging exhumed lower continental crust in the distal Jequitinhonha basin, Brazil ArchiMer
Loureiro, Afonso; Schnurle, Philippe; Klingelhofer, F.; Afilhado, A.; Pinheiro, Joao Marcelo; Evain, Mikael; Gallais, Flora; Dias, N. A.; Rabineau, Marina; Baltzer, Agnes; Benabdellouahed, Massinissa; Soares, J.; Fuck, R.; Cupertino, J. A.; Viana, A.; Matias, L.; Moulin, Maryline; Aslanian, Daniel; Vinicius Aparecido Gomes De Lima, M..
Twelve combined wide-angle refraction and coincident multi-channel seismic profiles were acquired in the Jequitinhonha-Camamu-Almada, Jacuípe, and Sergipe-Alagoas basins, NE Brazil, during the SALSA experiment in 2014. Profiles SL11 and SL12 image the Jequitinhonha basin, perpendicularly to the coast, with 15 and 11 four-channel ocean-bottom seismometers, respectively. Profile SL10 runs parallel to the coast, crossing profiles SL11 and SL12, imaging the proximal Jequitinhonha and Almada basins with 17 ocean-bottom seismometers. Forward modelling, combined with pre-stack depth migration to increase the horizontal resolution of the velocity models, indicates that sediment thickness varies between 3.3 km and 6.2 km in the distal basin. Crustal thickness at...
Tipo: Text Palavras-chave: NE Brazil; South Atlantic Ocean; Passive margins; Wide-angle refraction seismic; PSDM; Crustal structure; Cretaceous breakup; Lower continental crust.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00428/53928/55054.pdf
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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
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La marge sud-marocaine et les premières phases d'ouverture de l'océan Atlantique Central ArchiMer
Labails, Cinthia.
We here propose a twofold approach to study the continental margins of the Central Atlantic Ocean, with special focus on the South Morocco Margin, in front of Reguibat bloc. This approach is based on plate kinematics reconstructions and geological field studies to map and constrain the geometry of the plate boundary though time and seismic sections (reflection and refraction) to decipher the tectonic and sedimentary history of the margin. Sahabi et al. (2004) recently showed that the opening of the central Atlantic Ocean started 195 my ago (Sinemurian basis) (i.e. 20 my later than what was generally proposed in earlier models). Based on this result and on the analysis of geophysical data (including new seismic lines, a new magnetic anomaly grid and...
Tipo: Text Palavras-chave: Tectonic inheritance; Combined wide angle and deep reflection seismic; South Moroccan margin; Crustal structure; Non volcanic continental passive margin; Héritage tectonique; Sismique réflexion et réfraction; Structure crustale; Marge continentale passive Sud Maroc.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-3791.pdf
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Limits of the seismogenic zone in the epicentral region of the 26 December 2004 great Sumatra-Andaman earthquake: Results from seismic refraction and wide-angle reflection surveys and thermal modeling ArchiMer
Klingelhoefer, Frauke; Gutscher, M. -a.; Ladage, S.; Dessa, J. -x.; Graindorge, D.; Franke, D.; Andre, Camille; Permana, H.; Yudistira, T.; Chauhan, A..
The 26 December 2004 Sumatra earthquake (M-w = 9.1) initiated around 30 km depth and ruptured 1300 km of the Indo-Australian-Sunda plate boundary. During the Sumatra-OBS (ocean bottom seismometer) survey, a wide-angle seismic profile was acquired across the epicentral region. A seismic velocity model was obtained from combined travel time tomography and forward modeling. Together with reflection seismic data from the SeaCause II cruise, the deep structure of the source region of the great earthquake is revealed. Four to five kilometers of sediments overlie the oceanic crust at the trench, and the subducting slab can be imaged down to a depth of 35 km. We find a crystalline backstop 120 km from the trench axis, below the fore-arc basin. A high-velocity zone...
Tipo: Text Palavras-chave: Middle america trench; Fore arc basin; Bottom seismographic observation; Subduction zone; Crustal structure; Accretionary prism; Mantle serpentinization; Aftershock distribution; Megathrust earthquakes; Velocity structure.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00000/11155/7737.pdf
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Lithospheric structuration onshore-offshore of the Sergipe-Alagoas passive margin, NE Brazil, based on wide-angle seismic data ArchiMer
Pinheiro, Joao Marcelo; Schnurle, Philippe; Evain, Mikael; Afilhado, A.; Gallais, Flora; Klingelhoefer, Frauke; Loureiro, Afonso; Fuck, R.; Soares, J.; Cupertino, J. A.; Viana, A.; Rabineau, Marina; Baltzer, Agnes; Benabdellouahed, Massinissa; Dias, N.; Moulin, Maryline; Aslanian, Daniel; Morvan, Laetitia; Maze, Jean-pierre; Pierre, Delphine; Pitel-roudaut, Mathilde; Rio, I; Alves, D.; Barros Junior, P.; Biari, Youssef; Corela, C.; Crozon, Jacques; Duarte, J. L.; Ducatel, Cecile; Falcao, C.; Fernagu, Philippe; Le Piver, David; Mokeddem, Zohra; Pelleau, Pascal; Rigoti, C.; Roest, Walter; Roudaut, Mickael.
The structure and nature of the crust underlying the Camamu-Almada-Jequitinhonha-Sergipe-Alagoas basins System, in the NE Brazilian margin, were investigated based on the interpretation of 12 wide-angle seismic profiles acquired during the SALSA (Sergipe ALagoas Seismic Acquisition) experiment in 2014. In this work, we present two 220-km-long NW-SE combined wide-angle and reflection seismic profiles, SL 01 and SL 02, that have been acquired using 15 ocean-bottom-seismometers along each profile, offshore the southern part of the Sergipe Alagoas Basin (SAB), north of the Vaza-Barris Transfer zone. The SL 02 has a 150-km long inland continuation with 20 land-seismic-stations until the Sergipano Fold Belt (SFB). Wide-angle seismic forward modeling allows us to...
Tipo: Text Palavras-chave: South Atlantic ocean; NE Brazil; Sergipe-Alagoas basin; Passive margins; Wide-angle refraction seismics; Crustal structure; Tectonic inheritance.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00461/57263/59315.pdf
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Multiphased tectonic evolution of the Central Algerian margin from combined wide-angle and reflection seismic data off Tipaza, Algeria ArchiMer
Lepretre, Angelique; Klingelhoefer, Frauke; Graindorge, David; Schnurle, Philippe; Beslier, M. O.; Yelles, K.; Deverchere, Jacques; Bracene, R..
The origin of the Algerian margin remains one of the key questions still discussed in the Western Mediterranean sea, due to the imprecise nature and kinematics of the associated basin during the Neogene. For the first time, the deep structure of the Maghrebian margin was explored during the SPIRAL seismic survey. In this work, we present a N-S transect off Tipaza (west of Algiers), a place where the margin broadens due to a topographic high (Khayr-al-Din Bank). New deep penetration seismic profiles allow us to image the sedimentary sequence in the Algerian basin and the crustal structure at the continent-ocean boundary. Modeling of the wide-angle data shows thinning of the basement, from more than 15km in the continental upper margin to only 5–6km of...
Tipo: Text Palavras-chave: Algerian margin; Crustal structure; Wide-angle seismic data; Multiphased tectonic evolution; Western Mediterranean back-arc basins; Contractional reactivation.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00152/26333/24412.pdf
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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
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Seismic structure of the northwestern margin of the South China Sea: implication for asymmetric continental extension ArchiMer
Huang, Haibo; Qiu, Xuelin; Pichot, Thibaud; Klingelhoefer, Frauke; Zhao, Minghui; Wang, Ping; Hao, Tianyao.
Evolution of the continental margins of the South China Sea (SCS) is one of the open questions when discussing continental breakup and seafloor spreading. We processed data from a wide-angle seismic profile (OBS2011–1), which passes through the northwestern margin of the SCS, and performed travel time modeling to obtain the seismic velocity structures. The modeling results show a stepwise variation of the crustal thicknesses from continental margin to oceanic basin. Stretching factor of the upper crust is nearly double the estimate of the lower crust along the Zhongsha Trough. The lower crust shows asymmetrical upwelling towards the trough center, accompanied by ∼0.3 km/s of the velocity increase due to magmatic addition. The upper and lower crusts have...
Tipo: Text Palavras-chave: Seismic tomography; Continental tectonics: extensional; Crustal structure; Rheology: crust and lithosphere.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00500/61189/64720.pdf
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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
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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
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