Artículo
Environmental radioactivity in a sediment core from Algiers Bay: Radioecological assessment, radiometric dating and pollution records
Autor/es | Errahmani, Djabel Taieb
Noureddine, Abdelkader Abril Hernández, José María Boulahdid, Mostefa |
Departamento | Universidad de Sevilla. Departamento de Física Aplicada I |
Fecha de publicación | 2020 |
Fecha de depósito | 2022-10-03 |
Publicado en |
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Resumen | The sedimentary system of the Algiers Bay has been impacted in the last decades by the exponential increases in population, urbanism and industrial activities of the city of Algiers, and by episodic floods, mudflows, ... The sedimentary system of the Algiers Bay has been impacted in the last decades by the exponential increases in population, urbanism and industrial activities of the city of Algiers, and by episodic floods, mudflows, earthquakes and tsunamis. Activity concentrations of environmental gamma-emitters, namely 210Pb, 226Ra, 40K, 228Ra, 228Th and 137Cs, were measured in a sediment core sampled in 2015 at the central zone of this bay, at 73 m depth from the surface water. The 210Pb-based radiometric dating was challenging due to the incomplete recovery of the inventory, the absence of 137Cs peaks, and the failure of classical models. The analysis of clusters in the logarithmic plot of the excess 210Pb versus mass depth profile allowed for establishing a reliable chronology. Fluxes of excess 210Pb and sediment accumulation rates (SAR) have both varied over the last five decades. Recent SAR values are of 0.73 ± 0.21 g cm−2y−1. Major and trace elements were determined by X-Ray Fluorescence in some selected sediment slices. Moderate enrichments have been observed for Mn, Zn, Br, Rb, Sr, Y and Pb in the 0–1 cm sediment layer (when using Al as normalization element), being governed by Fe-rich carriers. The major impact is observed in the carbon content, which increased by two orders of magnitude (from their basal values) for three decades since early 70's. The dataset also allowed for a radioecological assessment in the area, performed using the ERICA software. |
Cita | Errahmani, D.T., Noureddine, A., Abril Hernández, J.M. y Boulahdid, M. (2020). Environmental radioactivity in a sediment core from Algiers Bay: Radioecological assessment, radiometric dating and pollution records. Quaternary Geochronology, 56 (March 2020, art. nº 101049), 1-12. |
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