Evidence for strong sediment redistribution by bottom currents along the southeast Indian ridge

Dezileau, Laurent; Bareille, Gilles; Reyss, Jean Louis; Lemoine, Flavien

doi:10.1016/s0967-0637(00)00008-x

Cited by 87 publications

(122 citation statements)

References 65 publications

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“…1) show that magnetic susceptibility is not related to variations in grain sizes but reflects changes in the flux of magnetite (Mazaud et al, 2007). Although the authors do not discuss their results in terms of aeolian input magnetic susceptibility profiles strongly resemble variations in Antarctic dust concentrations (Dezileau et al, 2000;Mazaud et al, 2007;Pugh et al, 2009). Potentially, in Laguna Potrok Aike grain size could only act as an indicator for aeolian activity but changes in the magnetic susceptibility signal might also be enhanced or solely related to changes in the flux of highly susceptible material.…”

Section: Aeolian Inputmentioning

confidence: 96%

Late Pleistocene dust deposition in the Patagonian steppe - extending and refining the paleoenvironmental and tephrochronological record from Laguna Potrok Aike back to 55 ka

Haberzettl

Anselmetti

Bowen

et al. 2009

Quaternary Science Reviews

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a b s t r a c tPaleoenvironmental records extending well into the last glacial period are scarce in the steppe regions of southern South America. Here, we present a continuous record for the past 55 ka from the maar lake Laguna Potrok Aike (51 58 0 S, 70 23 0 W, southern Patagonia, Argentina). Previous studies on a sedimentary core from a lake level terrace near the northern margin of the lake covered parts of Oxygen Isotope Stage (OIS) 3 (59-29 ka) whereas a second core from the centre of the basin comprised the last 16 ka. Tephrostratigraphical constraints and OSL ages from a third core located below the lake level terrace provide the crucial piece to close the gap between the previous coring sites. High-resolution XRF and magnetic susceptibility as well as grain size data indicate a positive hydrological balance alongside with relatively high aeolian activity during the glacial which is contemporaneous with increased dust fluxes in Antarctica. This is therefore the first evidence for contemporaneity of aeolian deposition in both the target area (Antarctica) and in the major source area of Patagonia. During the Holocene climatic conditions driving sediment deposition seem to have been more variable and less dominated by wind compared to glacial times. The identification of a minor lake level lowering at approximately 4 cal ka BP allows to refine earlier paleoenvironmental reconstructions for the Holocene. Within error margins the OSL ages are consistent with published radiocarbon-dated records offering hence a valuable tool for further studies of the sediments from Laguna Potrok Aike. The new chronology confirms the age of three tephra layers up to now only found in Laguna Potrok Aike sediments and ascribed to OIS 3.

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Section: Aeolian Inputmentioning

confidence: 96%

Late Pleistocene dust deposition in the Patagonian steppe - extending and refining the paleoenvironmental and tephrochronological record from Laguna Potrok Aike back to 55 ka

Haberzettl

Anselmetti

Bowen

et al. 2009

Quaternary Science Reviews

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“…Indeed, although significant progress was made to quantify the extent of advection through radionuclides (e.g., 231 Pa and 230 Th; Yu et al, 2001), nothing can be done to recuperate the original composition of sinking particles once diluted with resuspended material. Furthermore, lateral advection can redistribute particles on the seafloor affecting mass accumulation rates and therefore resulting in overestimating or underestimating burial fluxes (Dezileau et al, 2000;Geibert et al, 2005;Kienast et al, 2007;Sayles et al, 2001). Therefore, in areas where lateral advection is significant (Tesi et al, 2008(Tesi et al, , 2010, budgets of bioactive elements can be inaccurate if fluxes in the water column and to the seabed are exclusively interpreted as passive sinking of particles (Francois et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Particulate export and lateral advection in the Antarctic Polar Front (Southern Pacific Ocean): One-year mooring deployment

Tesi

Langone

Ravaioli

et al. 2012

Journal of Marine Systems

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“…Abott found E. antarctica abundantly throughout the Sub an tarc tic in the southeast Indian Ocean. Dezileau et al (2000) studied sediment redistribution around Southeast In di an Ridge and Kerguelen plateau stressing on the role of AABW. Shemesh et al (1989) have demonstrated that dissolution also acts as an important factor in the temporal and spatial variations of sedimentary diatom assemblages of the SO.…”

Section: Discussion a N D C O N C L U S I O N Smentioning

confidence: 99%

Study of Entrained Antarctic Diatoms from the Southwest Indian Ocean

Singh¹,

Singh²

2015

Bot Pac

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The study of surface sediments collected at a depth of 4100 m from the South west Indian Ocean reveals presence of only biogenic siliceous morphotypes con tai ning high amount of Antarctic diatoms. In addition the sediment also con tains radiolarians, silicoflagellates, and sponge spicules in decreasing order of abun dance after diatoms. The diatoms make about 70 % of the total siliceous com po nents and the assemblage is dominated by the Antarctic diatoms Thalassiosira len ti ginosa (Janisch) Fryxell, Fragilariopsis kerguelensis (O'Meara) Hustedt and Eucam pia an tarc tica (Castracane) Mangin. This study tries to look for the possible me cha nism of entrained Antarctic diatoms from their place of origin, Southern Ocean to as far as the southern limit of Indian Ocean. The long range lateral trans port has been viewed to have occurred under the influence of deep moving An tarc tic bottom water from the Southern Ocean to the Indian Ocean. The role of lateral transport in deep ocean siliceous sediment redeposition cannot be overlooked in the global ocean carbon transport. Р Е З Ю М ЕСингх В., Сингх Н. Исследование диатомей Юго-Западного Индийс-кого океана, принесенных из Антарктики. Исследование поверх ност ных отложений с глубины 4100 м югозападной части Индийского оке ана показало преобладание в осадках биогенных кремнистых морфотипов, со дер жа щих большое количество антарктических диатомовых водорослей. Кроме того, осадки содержат также радиолярии, силикофлагелляты и спи ку лы губок в порядке убывания обилия после диатомовых водорослей. Диа томеи составляют около 70 % от общего объема кремнистых компо нен тов, и в сообществе доминируют антарктические диатомеи Thalassiosira len ti gi nosa (Janisch) Fryxell, Fragilariopsis kerguelensis (O'Meara) Hustedt и Eucampia an tarc tica (Castracane) Mangin. Исследование представляет попытку поиска воз мож ного механизма дальнего переноса антарктических диатомей от их мес та происхождения -Южного океана, до южной границы Индийского оке ана. Столь дальний горизонтальный перенос представляется воз мож ным благо даря глубинным течениям придонных вод из Южного в Ин дийс кий океан. Горизонтальный перенос глубинными океаническими те че ниями кремни стых отложений не может быть проигнорирован в во просах глобального транспорта углерода в океане.

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Evidence for strong sediment redistribution by bottom currents along the southeast Indian ridge

Cited by 87 publications

References 65 publications

Late Pleistocene dust deposition in the Patagonian steppe - extending and refining the paleoenvironmental and tephrochronological record from Laguna Potrok Aike back to 55 ka

Late Pleistocene dust deposition in the Patagonian steppe - extending and refining the paleoenvironmental and tephrochronological record from Laguna Potrok Aike back to 55 ka

Particulate export and lateral advection in the Antarctic Polar Front (Southern Pacific Ocean): One-year mooring deployment

Study of Entrained Antarctic Diatoms from the Southwest Indian Ocean

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