Consulta: subjectFacets:"Passive margin"
Registros recuperados: 4
Data/hora: 11/06/2024 16:04:53

Oblique rifting and segmentation of the NE Gulf of Aden passive margin
Provedor de dados: 5
Autores: Fournier, M; Bellahsen, N; Fabbri, O; Gunnell, Y.
The Gulf of Aden is a young, obliquely opening, oceanic basin where tectonic structures can easily be followed and correlated from the passive margins to the active mid-oceanic ridge. It is an ideal laboratory for studies of continental lithosphere breakup from rifting to spreading. The northeastern margin of the Gulf of Aden offers the opportunity to study on land the deformation associated with oblique rifting over a wide area encompassing two segments of the passive margin, on either side of the Socotra fracture zone, exhibiting distinct morphologic, stratigraphic, and structural features. The western segment is characterized by an elevated rift shoulder and large grabens filled with thick synrift series, whereas the eastern segment exhibits low...
Tipo: Text
Palavras-chave: Continental breakup; Gulf of Aden; Oblique rifting; Paleostress; Passive margin; Segmentation; Continental margins and sedimentary basins; Continental tectonics-extensional; Stresses-crust and lithosphere.
Ano: 2004
URL: https://archimer.ifremer.fr/doc/00226/33728/32200.pdf

Crustal structure of the NW Moroccan margin from deep seismic data (SISMAR Cruise)
Provedor de dados: 5
Autores: Jaffal, Mohammed; Klingelhoefer, Frauke; Matias, Luis; Teixeira, Fernando; Amrhar, Mostafa.
During the SISMAR cruise (spring 2001), new deep seismic data were acquired on the Atlantic Moroccan margin. The purpose of the present work is to analyse and to interpret a part of the data consisting of four wide-angle seismic profiles (4, 5, 8 and 10) recorded offshore El Jadida. Lines 4 and 5, perpendicular to the margin, show a crustal thickness of 35 km under the western Moroccan Meseta which thins progressively seaward where it reaches a minimum thickness of 10 km. The calculated velocity models show that this crust consists of two crustal layers overlain by a sedimentary cover corresponding to the post-Paleozoic sediments, characterised by a low velocity. The detailed shallow structure is obtained primarily from multichannel seismic data. Half...
Tipo: Text
Palavras-chave: Morocco; Passive margin; Gravity; OBS; Velocity model; Deep seismic.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6588.pdf

Evidence for pre-Messinian submarine canyons on the Gulf of Lions slope (Western Mediterranean)
Provedor de dados: 5
Autores: Lofi, J; Berne, Serge.
On the Gulf of Lions margin, the Messinian Salinity Crisis (MSC) event led to a significant and widespread erosion of the Miocene shelf and slope. It is thus difficult nowadays to restore the morphology of the margin at the beginning of the crisis, and to study the Middle-Upper Miocene series rarely preserved from erosion. In this study, thanks to the use of multichannel seismic reflection data from the Gulf of Lions western slope, it has been possible to image the Miocene slope deposits. Interpretation of the data reveals several diachronic sediment bodies just beneath the Miocene/Pliocene boundary. These bodies are related to slope erosional-depositional complexes, underlain by erosional unconformities outlined by seismic reflector truncations. They are...
Tipo: Text
Palavras-chave: Messinian salinity crisis; Passive margin; Miocene/Pliocene; Submarine canyon.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4779.pdf

Buried fluvial incisions as a record of Middle-Late Miocene eustasy fall on the Armorican Shelf (Bay of Biscay, France)
Provedor de dados: 5
Autores: Paquet, Fabien; Menier, David; Estournes, Guilhem; Bourillet, Jean-francois; Leroy, Pascal; Guillocheau, Francois.
High-resolution seismic data have been acquired in June 2008 on the Armorican Shelf (AS), in the northern Bay of Biscay, in order to reassess its stratigraphic architecture in detail and to study the impact of eustasy, tectonic and sediment delivery on the margin sedimentary record. Several profiles show fluvial-type incisions of several tens of meters (up to 54 m) associated to a widespread erosion surface. Several hypotheses are proposed for the stratigraphic position of this surface and incisions. We suggest Middle to Late Miocene age. Considering the relatively quiescent tectonic activity of the margin, we infer that the relative sea-level fall responsible of aerial incision on the Miocene shelf is eustasy-related. We propose the attested...
Tipo: Text
Palavras-chave: Armorican Shelf; Incised valleys; Miocene; Eustasy; Passive margin.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00001/11200/8048.pdf