A mixed turbidite – contourite system related to a major submarine canyon: The Marquês de Pombal Drift (south‐west Iberian margin)
نویسندگان
چکیده
Synchronous interaction between bottom currents and turbidity has been reported often in channel–levée systems where the thickness of exceeds that levées. Such interplay along-slope down-slope sedimentary processes is one mechanisms by which ‘mixed turbidite–contourite systems’ can originate. However, flow over large areas seafloor, including continental slopes characterized deeply incised submarine canyons rather than channel In these cases, a direct is, theoretically, unlikely to take place. this study, oceanographic, swath bathymetry, multichannel seismic data sediment cores are used investigate 25 km long, 10 wide up 0.5 thick deep-sea late Quaternary deposit sits adjacent north-west flank major North Atlantic, São Vicente Canyon, Alentejo Basin (south-west Iberian margin). The area receives influence strong current, Mediterranean Outflow Water, swept slope at different water depth ranges during glacial interglacial periods. Architectural patterns characteristics suggest body, named Marquês de Pombal Drift, result Water (particularly cold periods) flowing along Canyon. Because canyon significantly deeper (ca 1.5 km) currents, an additional process, comparison earlier models, needed allow with transport out canyon. likely other worldwide, contour requires intermediate nepheloid layers export finer-grained fraction boundary masses.
منابع مشابه
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ژورنال
عنوان ژورنال: Sedimentology
سال: 2021
ISSN: ['1365-3091', '0037-0746']
DOI: https://doi.org/10.1111/sed.12844