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Contourite systems in the region of the southern São Paulo Plateau escarpment, South Atlantic
Borisov, D.G.; Murdmaa, I.O.; Ivanova, E.V.; Levchenko, O.V.; Yutsis, V.V.; Frantseva, T.N. (2013). Contourite systems in the region of the southern São Paulo Plateau escarpment, South Atlantic. Oceanology 53(4): 460-471. https://dx.doi.org/10.1134/s0001437013040012
In: Oceanology. Maik Nauka/Springer: Moscow. ISSN 0001-4370; e-ISSN 1531-8508
Peer reviewed article  
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Author keywords
    Marine Isotopic Stage; Benthic Foraminifer; Planktonic Foraminifer; North Atlantic Deep Water; Continental Rise
Auteurs  Top 
  • Borisov, D.G.
  • Murdmaa, I.O.
  • Ivanova, E.V.
  • Levchenko, O.V.
  • Yutsis, V.V.
  • Frantseva, T.N.
Abstract
    Seismoacoustic investigations with a high-resolution parametric echo-sounder “SES 2000 deep” carried out on cruises 33, 35, and 37 of the R/V Akademik Ioffe revealed several erosional-depositional contourite systems on the São Paulo Plateau escarpment and its toe in the South Atlantic. Two contourite terraces related to interfaces between different water masses are observable on the escarpment. These terraces presumably reflect the activity of internal waves and turbulent eddies. The São Paulo contourite channel and genetically related drift are traceable along the escarpment toe. Changes in planktonic foraminiferal assemblages in Core AI-2563 retrieved from the summit of the São Paulo contourite drift suggest a shallowing of the Weddell Sea Deep Water mass during glacial times. It is established that the contour current of the Weddell Sea Deep Water and Lower Circumpolar Water considerably affect the formation of contourite depositional systems on the escarpment and its toe.
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