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Title: 133,000 Years of Sedimentary Record in a Contourite Drift in the Western Alboran Sea: Sediment Sources and Paleocurrent Reconstruction
Author: López González, Nieves
Alonso, Belén (Alonso Martínez)
Juan, Carmen
Ercilla, Gemma
Bozzano, Graziella
Cacho Lascorz, Isabel
Casas, David
Palomino, Desirée
Vázquez, Juan-Tomás
Estrada, Ferran
Bárcenas, Patricia
Acremont, Elia d'
Gorini, Christian
El Moumni, Bouchta
Keywords: Paleoceanografia
Sediments marins
Marine sediments
Issue Date: 7-Aug-2019
Publisher: MDPI
Abstract: The Djibouti Ville Drift is part of a contourite depositional system located on the southern side of the Djibouti Ville Seamount in the Alboran Sea (Western Mediterranean). The sedimentary record of a core located in the drift deposits has been characterized to achieve the possible sediment sources for the Saharan dust supply and the paleocurrent variability related to Mediterranean intermediate waters for the last 133 kyr. Three end-member grain-size distributions characterize the sediment record transported by the bottom current to address the different aeolian populations, i.e., coarse EM1, silty EM2, and fine EM3. For these particles, the most likely source areas are the Saharan sedimentary basins and deserts, as well as the cratonic basins of the Sahara-Sahel Dust Corridor. The prevalence of these main source areas is shown in the core record, where a noticeable change occurs during the MIS 5 to MIS 4 transition. Some punctual sediment inputs from the seamount have been recognized during sea-level lowstand, but there is no evidence of fluvial supply in the drift deposits. The paleocurrent reconstruction allows the characterizing of the stadial and cold periods by large increases in the mean sortable silt fraction and UP10, which point to an enhanced bottom current strength related to intermediate water masses. Conversely, interglacial periods are characterized by weaker bottom current activity, which is associated with denser deep water masses. These proxies also recorded the intensified Saharan wind transport that occurred during interstadial/stadial transitions. All these results point to the importance of combining sediment source areas with major climatic oscillations and paleocurrent variability in palaeoceanographic sedimentary archives, which may help to develop future climate prediction models.
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It is part of: Geosciences, 2019, vol. 9, num. 8
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ISSN: 2076-3263
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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