Sediment geochronology and geochemical behavior of major and rare earth elements in the Oualidia Lagoon in the western Morocco

Mejjad, Nezha; Laissaoui, A.; El-Hammoumi, Ouafa; Benmansour, M.; Benbrahim, Samir; Bounouira, H.; Benkdad, Azzouz; Bouthir, Fatima Zohra; Fekri, Ahmed; Bounakhla, M.

doi:10.1007/s10967-016-4714-8

Cited by 39 publications

(13 citation statements)

References 30 publications

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“…Dans cette étude nous avons opté pour une échelle saisonnière car le fonctionnement est abordé à travers l'équilibre entre le bilan hydrique à partir des apports continentaux et des régimes des précipitation et d'évaporation, dominant en milieu lagunaire, ainsi que les échanges marins qui ont aussi un impact important sur la lagune en plus de l'impact continental (Mejjad et al, 2016 L´étude hydrologique de la lagune de Oualidia réalisée pendant l'année 2011 a mis en évidence une répartition hydrologique saisonnière et spatiale. En pleine mer, la lagune est plus influencée par l'envahissement des masses d´eau à caractéristique marine.…”

Section: Résultats Et Discussionunclassified

Etat Oceanographique De La Lagune De Oualidia, Maroc (2011-2012)

Makaoui

Idrissi

Agouzouk

et al. 2018

ESJ

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The study of the Oualidia lagoon aims to establish the state of knowledge of the environment of this ecosystem after the construction of an inner dam in 2011 and the ecological functioning of the lagoon. For that, several campaigns were carried out between February 2011 and October 2012 and were the subject of a seasonal monitoring for the collection of the main biotic and abiotic parameters of the environment of this ecosystem. During the construction of the inner dam on 2011, a hydrological variability was marked in summer by low oxygen levels and maximum temperature variation between the two tides. Since the completion of the construction of the inner dam, there has been a significant increase in nutrients, mainly nitrogenous elements, and an increase in turbidity caused by an improvement in hydrodynamics, which has particularly increased of the sandpit modified the morphology and moved on south, creating a new main channel structure in 2011. This hydrodynamic was manifested on the upstream area by a decrease of the sedimentary organic European Scientific Journal June 2018 edition Vol.14, No.18 ISSN: 1857 -7881 (Print) e -ISSN 1857 94 matter due to the trapping of fine sediments in the inner dam. At the immediate level of the upstream area (Slikkes and Schorres), the hydrodynamic is relatively low, which has reduced the sedimentation rate on the upstream of the lagoon. The Oualidia lagoon is situated in a littoral zone influenced by the enrichment in deep cold waters loaded with nutritive salts, which invade it during the high tide, and would be, consequently after construction of the inner dam, protected from any confinement of the ecosystem.

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Section: Résultats Et Discussionunclassified

Etat Oceanographique De La Lagune De Oualidia, Maroc (2011-2012)

Makaoui

Idrissi

Agouzouk

et al. 2018

ESJ

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“…3). Indeed, the percentage of sandy particles in the upmost layer of the SC-1 core is 50% versus 30% in the SC-2 core, which could result in enhancing 210 Pb content due to its high affinity to finer particles (Mejjad et al, 2016;Arias-Ortiz et al, 2018;Fontela et al, 2019). The vertical profiles shown in Figure 3 indicate a predominance of mud content and some degree of fluctuations in the upper layers, in particular in the SC-1 core.…”

Section: Dating Sediment Coresmentioning

confidence: 96%

Evaluating the historical sedimentation patterns in two different Mediterranean deep environments (Sardinia and Sicily Channels)

et al. 2019

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The sediment accumulation rate in the Sardinia and Sicily channels in the central part of the Mediterranean Sea was studied by using short-lived radionuclides (210Pb and 137Cs) in two deep sediment cores. Different sedimentation regimes were identified indicating substantial differences in accumulation rates and historical patterns. The 210Pb-derived mean accumulation rate found in the Strait of Sardinia was 0.05 g.cm-2.y-1, lower than that in Sicily Channel (0.1 g.cm-2.y-1) suggesting an inverse correlation with water depth. Excess 210Pb inventories were 24 ± 1 and 6.0 ± 0.4 kBq.m-2, while the fluxes to the sediment were 745 ± 31 and 188 ± 11 Bq.m-2.y-1 in Sicily and Sardinia channels, respectively. 137Cs failed to use for the validation of the established chronologies, while its inventories found 450 Bq.m-2 and 355 Bq.m-2 in the Sicily and Sardinia channel, respectively.

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“…As cerium was found to be significantly correlated with the other REEs, except Pr, it should be considered that post-depositional changes in Ce anomalies did not take place. However, the profiles are affected by two REEs inputs of different origins and periods: 1) the downcore negative anomaly is attributable to a natural event (possibly coastal upwelling associated with hydrological regime) which produced input of RREs depleted in Ce, characteristic of deep-sea waters [17][18][19][20][21][22][23], and 2) the positive anomaly recorded at the subsurface section is indicative of an anthropogenic source of REEs to the lagoon sediment, likely the phosphogypsum effluents and agricultural activities. Negative Ce anomalies were reported for sandy sediment from the Oualidia lagoon located at about 50 km from the study site [23].…”

Section: Correlations and Ce And Eu Anomaliesmentioning

confidence: 99%

Assessment of Chronological Records of Rare Earth Elements in Sidi Moussa Lagoon Sediment (North-Western Morocco)

Benmhammed¹,

Laissaoui²,

Mejjad³

et al. 2021

eer

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Rare Earth Elements and yttrium (REEs+Y) were measured by inductively Coupled Plasmas -Mass Spectrometry in two previously dated sediment cores collected from Sidi Moussa lagoon, located in the Moroccan Atlantic coast, in order to establish the historical inputs of these elements and to determine the contribution of anthropogenic activities. In an attempt to clarify the phase associations of REE+Y, the Ce anomaly profiles were partitioned into three parts: the upper part with negative anomalies, except for a positive Ce/Ce* peak in 1983, the middle part with positive anomalies rising to high Ce/Ce*, and the lower part with also fairly increasing positive anomalies. Pearson correlations were calculated between REE+Y and major elements (Mn, Fe and Al) in different parts of Core-1. REE+Ys, except for Pr, were significantly correlated only with Mn, which suggests that the associated phase in the upper part consists of Mn oxides. The central part is characterized by a negative correlation of REE+Y with Mn and a positive correlation with Fe. The maximal concentrations were observed in two horizons in the sediment cores being attributed to both natural and industrial sources. The association of REEs with manganese oxides, iron-rich minerals and detritus material was changing in different parts of the cores. Only in specific layers, all REEs were weakly to moderately enriched, while yttrium was moderately to strongly enriched. The notable reduction in the upper layers is a reflection of the environmental management plan implemented by the phosphate company and the change in the morphology of the lagoon, which has reduced communication with the ocean.

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Sediment geochronology and geochemical behavior of major and rare earth elements in the Oualidia Lagoon in the western Morocco

Cited by 39 publications

References 30 publications

Etat Oceanographique De La Lagune De Oualidia, Maroc (2011-2012)

Etat Oceanographique De La Lagune De Oualidia, Maroc (2011-2012)

Evaluating the historical sedimentation patterns in two different Mediterranean deep environments (Sardinia and Sicily Channels)

Assessment of Chronological Records of Rare Earth Elements in Sidi Moussa Lagoon Sediment (North-Western Morocco)

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