Investigations of Lateral Sedimentation and Water Mass Properties in the Tropical Atlantic during Cruise 60 of the R/V Akademik Ioffe

Иванова, Е. В.; Borisov, D. G.; Demidov, A. N.; Dmitrevskiy, N. N.; Shulga, N. A.; Dufour, A.; Krasheninnikova, S. B.; Kirillova, O. I.; Drobosuk, N. S.

doi:10.1134/s000143702204004x

Cited by 6 publications

(1 citation statement)

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“…The high-resolution sub-bottom (seismoacoustic) profiles were collected during the RV Akademik Ioffe cruise 60 (2022) 60 . The survey was carried out using the SES 2000 deep narrow-beam parametric sub-bottom profiler with the center frequency of 4 kHz.…”

Section: Methodsmentioning

confidence: 99%

Unveiling the contourite depositional system in the Vema Fracture Zone (Central Atlantic)

Borisov,

Frey,

Ivanova

et al. 2023

Sci Rep

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A combination of a high sediment input and intense bottom currents often leads to the formation of contourites (sediments deposited or significantly reworked by bottom currents). Both of these components are present in the Vema Fracture Zone valley which is the most important passageway for the distribution of the Antarctic Bottom Water from the West to the North-East of the Atlantic. However, no contourite drifts, moats or contourite channels have been found in this region in more than half a century of research. The prevailing sedimentation paradigm postulates that turbidity currents have predominantly governed sedimentation in this region during the Pleistocene. This work describes the first example of contourite depositional system identified in the Vema Fracture Zone. The discovery was made through detailed high-resolution sub-bottom profiling, as well as numerical modeling and direct measurements of bottom current velocities. Such systems are exceptionally uncommon in fracture zones. This study highlights the importance of further research of contourites along the Vema Fracture Zone based on modern concepts of contourite and mixed depositional systems. The work also emphasizes the need to reevaluate the impact of bottom currents on sedimentation in this region, and particularly in the narrow segments of the fracture zone valley.

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Section: Methodsmentioning

confidence: 99%