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Crustal structure variations along the NW-African continental margin: a comparison of new and existing models from wide-angle and reflection seismic data ArchiMer
Klingelhoefer, Frauke; Biari, Youssef; Sahabi, Mohamed; Aslanian, Daniel; Schnabel, Michael; Matias, Luis; Benabdellouahed, Massinissa; Funck, Thomas; Gutscher, Marc-andre; Reichert, Christian; Austin, James A..
Deep seismic data represent a key to understand the geometry and mechanism of continental rifting. The passive continental margin of NW-Africa is one of the oldest on earth, formed during the Upper Triassic–Lower Liassic rifting of the central Atlantic Ocean over 200 Ma. We present new and existing wide-angle and reflection seismic data from four study regions along the margin located in the south offshore DAKHLA, on the central continental margin offshore Safi, in the northern Moroccan salt basin, and in the Gulf of Cadiz. The thickness of unthinned continental crust decreases from 36 km in the North to about 27 km in the South. Crustal thinning takes place over a region of 150 km in the north and only 70 km in the south. The North Moroccan Basin is...
Tipo: Text Palavras-chave: Moroccan continental margin; Wide-angle seismic; Passive margins; Deep structure; Plate reconstruction.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00316/42685/42058.pdf
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Response of Cenozoic turbidite system to tectonic activity and sea-level change off the Zambezi Delta ArchiMer
Castelino, Jude A.; Reichert, Christian; Jokat, Wilfried.
Submarine fans and turbidite systems are important and sensitive features located offshore from river deltas that archive tectonic events, regional climate, sea level variations and erosional process. Very little is known about the sedimentary structure of the 1800 km long and 400 km wide Mozambique Fan, which is fed by the Zambezi and spreads out into the Mozambique Channel. New multichannel seismic profiles in the Mozambique Basin reveal multiple feeder systems of the upper fan that have been active concurrently or consecutively since Late Cretaceous. We identify two buried, ancient turbidite systems off Mozambique in addition to the previously known Zambezi-Channel system and another hypothesized active system. The oldest part of the upper fan, located...
Tipo: Text Palavras-chave: Mozambique Fan; Turbidite systems; Late Cretaceous bottom current; Beira High Channel-levee system; African Uplift; Zambezi River.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00376/48698/49032.pdf
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