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• W2000964110 abstract "The Columbia Channel (CCS) system is a depositional system located in the South Brazilian Basin, south of the Vitoria–Trindade volcanic chain. It lies in a WNW–ESE direction on the continental rise and abyssal plain, at a depth of between 4200 and 5200 m. It is formed by two depocenters elongated respectively south and north of the channel that show different sediment patterns. The area is swept by a deep western boundary current formed by AABW. The system has been previously interpreted has a mixed turbidite–contourite system. More detailed study of seismic data permits a more precise definition of the modern channel morphology, the system stratigraphy as well as the sedimentary processes and control. The modern CCS presents active erosion and/or transport along the channel. The ancient Oligo-Neogene system overlies a “upper Cretaceous–Paleogene” sedimentary substratum (Unit U1) bounded at the top by a major erosive “late Eocene–early Oligocene” discordance (D2). This ancient system is subdivided into 2 seismic units (U2 and U3). The thick basal U2 unit constitutes the larger part of the system. It consists of three subunits bounded by unconformities: D3 (“Oligocene–Miocene boundary”), D4 (“late Miocene”) and D5 (“late Pliocene”). The subunits have a fairly tabular geometry in the shallow NW depocenter associated with predominant turbidite deposits. They present a mounded shape in the deep NE depocenter, and are interpreted as forming a contourite drift. South of the channel, the deposits are interpreted as a contourite sheet drift. The surficial U3 unit forms a thin carpet of deposits. The beginning of the channel occurs at the end of U1 and during the formation of D2. Its location seems to have been determined by active faults. The channel has been active throughout the late Oligocene and Neogene and its depth increased continuously as a consequence of erosion of the channel floor and deposit aggradation along its margins. Such a mixed turbidite–contourite system (or fan drift) is characterized by frequent, rapid lateral facies variations and by unconformities that cross the whole system and are associated with increased AABW circulation." @default.
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• W2000964110 date "2009-10-01" @default.
• W2000964110 modified "2023-09-25" @default.
• W2000964110 title "The Oligocene–Neogene deep-sea Columbia Channel system in the South Brazilian Basin: Seismic stratigraphy and environmental changes" @default.
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• W2000964110 doi "https://doi.org/10.1016/j.margeo.2009.07.009" @default.
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