Geochemical and mineralogical fingerprints of the sediments supply and early diagenetic processes in the Bizerte Lagoon (Tunisia)

Type Article
Date 2016-10
Language English
Author(s) Zaaboub Noureddine1, Alves Martins Maria VirginiaORCID2, 3, Laraterroso Denise3, Helali Mohamed Amine1, Bejaoui Bechir1, El Bour Monia1, Boukef-Benomrane Imen1, Louzada Pereira Aline2, Dardon Ulisses2, Oueslati Walid4, Ennouri Rym1, Galgani Francois5, Ferreira Da Silva EduardoORCID3, Rocha Fernando3, Aleya Lotfi6
Affiliation(s) 1 : Inst Natl Sci & Technol Mer, Lab Milieu Marin, Salammbo 2025, Tunisia.
2 : Univ Estado Rio De Janeiro, LMP, Lab Micropaleontol, Fac Geol,Dept Estratig & Paleontol, Av Sao Francisco Xavier 524,Sala 4037F, BR-20550013 Rio De Janeiro, RJ, Brazil.
3 : Univ Aveiro, Dept Geociencias, Unidade Invest GeoBioTec, Campus Santiago, P-3810193 Aveiro, Portugal.
4 : Univ Tunis El Manar, Fac Sci Tunis, Dept Geol, Lab Ressources Miner & Environm, Tunis 2092, Tunisia.
5 : IFREMER, LER, PAC, Immeuble Agostini, F-20600 Bastia, France.
6 : Univ Bourgogne Franche Comte, CNRS, Lab Chronoenvironm, UMR 6249, F-25030 Besancon, France.
Source Journal Of Sedimentary Environments (2447-9462) (Univ Estado Rio De Janeiro, Fac Geologia), 2016-10 , Vol. 1 , N. 4 , P. 432-448
DOI 10.12957/jse.2016.26881
WOS© Times Cited 2
Keyword(s) Mediterranean coastal lagoon, Allochthonous sediments, Autochthonous sediments, Circulation, Multiproxy approach, Bizerte Lagoon
Abstract

The Bizerte Lagoon (Tunisia) functions as a sedimentation environment characterized by receiving allochthonous sediments mainly transported by the Ben Hassine, Rharek and Guenich streams, as well as marine sediments from the Mediterranean Sea. It is subjected to significant environmental changes due to the natural and anthropic influences altering the natural patterns of circulation, extraction and/or deposition of mineralogical materials. The aim of this investigation is to analyze the sediments supply and early diagenetic processes in Bizerte Lagoon. The physicochemical parameter of the sediment pore water, as well as their texture, mineralogical composition (X-Ray diffraction technique - XRD), magnetic susceptibility and their geochemical composition (namely lithogenic and biogenic chemical elements analyzed by ICP-MS) were analyzed in 10 sampling stations. The water temperature with an average of 15.2 degrees C was stable in the study area. The sediments were generally characterized by fine granulometry, mainly mud and sandy mud, poorly to very poorly sorted, and constituted by two or more granulometric particle modes. The mineralogical results revealed the presence of phyllosilicates, quartz, pyrite, calcite, anatase and K-feldspar, and other minerals in smaller proportions. The fine sediment and high phyllosilicates and Al contents indicate the presence of weak currents in most part of the studied area. The results of sorting, skewness and kurtosis suggest that the currents are more active in the northern region of the lagoon, near the channel of communication with the Mediterranean Sea. They also evidence a coarser particle contribution of the Ben Hassine stream to the lagoon. The other streams seem to introduce mostly fine-grained sediments in the lagoon. The currents circulation, the water residence time and the biological productivity influence the mineralogical and geochemical characteristics of the bottom sediments. The industrial activity is also an important factor, since it results in the accumulation of high levels of some metals, such as Fe. Metals are mostly retained in the sediment in areas with active biogeochemical activity due to high organic matter accumulation. Mineralogical and geochemical patterns indicate contributions from different rocks sources, diverse processes of transport and deposition of sediments and varied processes of production of autochthonous materials.

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Zaaboub Noureddine, Alves Martins Maria Virginia, Laraterroso Denise, Helali Mohamed Amine, Bejaoui Bechir, El Bour Monia, Boukef-Benomrane Imen, Louzada Pereira Aline, Dardon Ulisses, Oueslati Walid, Ennouri Rym, Galgani Francois, Ferreira Da Silva Eduardo, Rocha Fernando, Aleya Lotfi (2016). Geochemical and mineralogical fingerprints of the sediments supply and early diagenetic processes in the Bizerte Lagoon (Tunisia). Journal Of Sedimentary Environments, 1(4), 432-448. Publisher's official version : https://doi.org/10.12957/jse.2016.26881 , Open Access version : https://archimer.ifremer.fr/doc/00709/82142/