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Registros recuperados: 3
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Buoyancy and localizing properties of continental mantle lithosphere: Insights from thermomechanical models of the eastern Gulf of Aden ArchiMer
Watremez, L.; Burov, E.; D'Acremont, E.; Leroy, Sylvie; Huet, B.; Lepourhiet, L.; Bellahsen, N..
Physical properties of the mantle lithosphere have a strong influence on the rifting processes and rifted structures. In particular, in context of rifting, two of these properties have been overlooked: (1) Mohr-Coulomb plasticity (localizing pressure dependent) may not be valid at mantle depths as opposed to nonlocalizing pressure-independent plasticity (hereafter, perfect plasticity), and (2) lithosphere buoyancy can vary, depending on the petrological composition of the mantle. Focussing on the Arabian plate, we show that the lithosphere may be negatively buoyant. We use thermomechanical modeling to investigate the importance of mantle rheology and composition on the formation of a passive margin, ocean-continent transition (OCT) and oceanic basin. We...
Tipo: Text Palavras-chave: Thermomechanical modeling; Rifting; Ocean-continent transition; Plasticity; Lithosphere buoyancy; Gulf of Aden.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00199/31070/29483.pdf
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Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) ArchiMer
Lafosse, M.; Gorini, C.; Le Roy, P.; Alonso, B.; D'Acremont, E.; Ercilla, G.; Rabineau, Marina; Vazquez, J. T.; Rabaute, A.; Ammar, A..
In active basins, tectonics can segment the continental shelf and control its stratigraphic architecture and physiography. Segmentation can explain the local evolution and morphology of the continental shelf because of sea-level variations, local tectonic segmentation and hydrodynamic processes. Here we investigate the tectonically active Morocco continental margin (southern Alboran Sea) using high-resolution seismic profiles and multibeam bathymetric data. The active faults bounding the transtensive Nekor basin triggered the segmentation of the shelf into three sectors showing different subsidence rates: a western sector corresponding to an extensive fault relay, a central sector corresponding to the subsiding Al-Hoceima Bay and an eastern sector...
Tipo: Text Palavras-chave: Seismic stratigraphy; Active tectonic; Pleistocene; Continental shelf; Swath bathymetry; Geomorphology; Western Mediterranean.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00451/56232/57812.pdf
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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
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