Changing sea-surface and deep-water conditions in the southern Cape Verde Basin during the mid-Pleistocene to Holocene

Kuleshova, L. A.; Bashirova, L. D.; Matul, A. G.; Andersen, Nils; Ponomarenko, E. P.

doi:10.1016/j.palaeo.2022.110921

Cited by 3 publications

(10 citation statements)

References 68 publications

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“…Да-лее проводили визуальное литологическое описание осадков и отбор проб из рабочей половины непрерывно с шагом 1 см. Ранее для колонки АНС-33047 была получена возрастная модель [Kuleshova et al, 2022], которая основана на сопоставлении данных стабильных изотопов кислорода с глобальной кривой LR04 [Lisiecki, Raymo, 2005], а также на результатах измерения магнитной восприимчивости и содержания карбоната кальция в осадке. Возраст основания вскрытых отложений составил 513 тыс.…”

Section: рис 1 карта района исследования и общая схема поверхностной ...unclassified

“…лет [Kamikuri et al, 2009]. Данный датировочный уровень не противоречит возрастной модели колонки АНС-33047, что повышает достоверность выполненного ранее стратиграфического расчленения осадочного разреза [Kuleshova et al, 2022].…”

Section: рис 1 карта района исследования и общая схема поверхностной ...unclassified

“…2. Сопоставление кривых распределения общей численности и процентного содержания экологических групп диатомей и радиолярий с результатами анализа планктонных фораминифер (ПФ) [Kuleshova et al, 2022] в колонке АНС-33047.…”

Section: рис 1 карта района исследования и общая схема поверхностной ...unclassified

“…Градиентными стрелками показаны интервалы развития глубоководного палеоапвеллинга, реконструированные по индексу R N/Gg [Kuleshova et al, 2022] КУЛЕШОВА И ДР.…”

Section: рис 1 карта района исследования и общая схема поверхностной ...unclassified

“…Настоящая работа посвящена изучению количественного распределения и таксономического со-става сообществ диатомей и радиолярий в колонке АНС-33047, отобранной в южной части котловины Зеленого Мыса к востоку от Срединно-Атлантического хребта на глубине более 4 км. Осадки исследуемой колонки имеют средне-позднечетвертичный возраст [Kuleshova et al, 2022]. Особенностью данного района является его близкое расположение к северной границе экваториального кремневого пояса, являющегося зоной повышенного накопления диатомово-радиоляриевых илов [Nigrini, 1967;Goll, Bjørklund, 1971;Матуль, 1989;Schrader et al, 1993;Sarmiento, Gruber, 2006;Boltovskoy, Correa, 2017].…”

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Quaternary Siliceous Microfossils of the Equatorial Atlantic and Their Role for Paleoceanographic Reconstructions

Kuleshova,

Matul,

Kazarina

et al. 2023

Lomonosov Geography Journal

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The paper presents the quantitative and taxonomic analysis of siliceous microfossils (diatoms and radiolarians) of the ANS-33047 deepsea core (08°16,380′ N, 31°42,870′ W, 4027 mbsl, 5,16 mbsf), from the southern part of the Cape Verde Basin in the eastern equatorial Atlantic. We recognized two groups of radiolarians representing typical tropical-equatorial and temperate North Atlantic microfauna. The assemblage of fossil diatoms includes tropical-equatorial species, as well as freshwater diatoms which indicate the aeolian transfer of particulate matter from Africa. Sporadic distribution of diatoms and radiolarians indicates pulsatile character of silica accumulation in the equatorial zone during the Quaternary, i.e. intermittent periods with relatively intense and definitely weak silica accumulation. Both diatoms and radiolarians were dominant silica producers during the short intervals of marine isotope stages (MIS) 13-8. Their higher concentrations at ca. 513, 430, 300, and 250 ka probably reflect the penetration of highly productive waters of the Equatorial Divergence into the study area. Low numbers of diatoms coupled with the radiolarian abundance during some intervals of MIS 7-1 are probably the evidence of less productive conditions in the surface water layer and the alternating influence of deep-water paleo-upwellings, primarily on the subsurface. The peak of the freshwater diatoms at ca. 464 ka (MIS 12) indicates the possible intensification of deflation processes and the Tropical Easterly Jet transporting aeolian dust f rom African arid areas to the Atlantic Ocean.

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Section: рис 1 карта района исследования и общая схема поверхностной ...unclassified

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Quaternary Siliceous Microfossils of the Equatorial Atlantic and Their Role for Paleoceanographic Reconstructions

Kuleshova,

Matul,

Kazarina

et al. 2023

Lomonosov Geography Journal

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Pleistocene Paleoceanographic Conditions in the Ioffe Drift Area (South Atlantic) Based on Benthic Foraminiferal Assemblages

Ovsepyan

Grechikhina

2023

Oceanology

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Pleistocene Paleoceanographic Conditions in the Ioffe Drift Area (South Atlantic) Based on Benthic Foraminiferal Assemblages

Ovsepyan,

Grechikhina

2023

Okeanologiâ

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The Ioffe Drift located in the western South Atlantic to the north-east to the Vema Channel was discovered in the 32nd cruise of the R/V “Akademik Ioffe” in 2010. The analysis of the seismoacoustic, biostratigraphic, lithological, grain-size, geochemical and X-ray fluorescence data allowed to estimate the Pleistocene age of the upper part of the drift as well as to confirm contourite genesis of the sediments. Quantitative analyses of benthic foraminiferal assemblages are carried out in the sediment core AI-2436 (26°51.6′ S, 34°01.40′ W, 3800 m water depth) collected near the drift summit. The obtained results allowed reconstructing relative changes of the organic matter flux to the seafloor, its periodicity and bottom current intensity as well as suggesting interplay of the deep-water masses during the Pleistocene. Visual evaluation of benthic foraminiferal tests allowed distinguishing three groups of damages of presumably variable genesis. First group includes damages possibly resulted from impacts of particles transporting by bottom currents. Second group consists of damages that appeared due to movement of the tests by strong bottom currents. Third group contains deformations caused by dissolution in carbonate-aggressive bottom-water environment. Thus, specific features of the tests in combination with traditional methods may serve as a supporting technique for diagnostics of contourites. However, this method demands a development of application criteria and should be verified on reliable material.

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Changing sea-surface and deep-water conditions in the southern Cape Verde Basin during the mid-Pleistocene to Holocene

Cited by 3 publications

References 68 publications

Quaternary Siliceous Microfossils of the Equatorial Atlantic and Their Role for Paleoceanographic Reconstructions

Quaternary Siliceous Microfossils of the Equatorial Atlantic and Their Role for Paleoceanographic Reconstructions

Pleistocene Paleoceanographic Conditions in the Ioffe Drift Area (South Atlantic) Based on Benthic Foraminiferal Assemblages

Pleistocene Paleoceanographic Conditions in the Ioffe Drift Area (South Atlantic) Based on Benthic Foraminiferal Assemblages

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