Paleoredox reconstruction of bituminous shales from the Miocene Hançili Formation, Çankırı-Çorum Basin, Turkey: Evaluating the role of anoxia in accumulation of organic-rich shales

The present study evaluates the distribution of metals over the last 100 years in the Oualidia lagoon by examining their concentrations in the sediment cores. The samples were analyzed by instrumental neutron activation analysis and inductively coupled plasma mass spectrometry. Activities of Pb,Ra, and Cs were determined by gamma-ray spectrometry for establishing the age-depth relationships throughout the sediment cores by applying conventional models. The results indicated that the study area is contaminated by As and Cd revealing a detectable anthropogenic input of occurring metals as a consequence of the continuous development of human activities around the lagoon since 1950. The enrichment factor calculated for each layer of the three cores revealed that the studied sediments present no enrichment by Pb, K, and Mn; minor enrichment by Zn, Cr, Co, Cu, V, and Ni; and a moderately to severe enrichment by As and Cd. The pollution load index values increase from the bottom to the top of cores, and ranged from 0.9 to 2.8, which indicates levels of pollutants ranging from background to relatively high concentrations in the investigated sediments.

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Geochemical characterization of rare earth elements in sediment profiles from the Oualida lagoon (Morocco)

Mejjad

Laissaoui

Hammoumi

et al. 2023

Acta Geochim

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Paleoredox reconstruction of bituminous shales from the Miocene Hançili Formation, Çankırı-Çorum Basin, Turkey: Evaluating the role of anoxia in accumulation of organic-rich shales

Cited by 9 publications

References 56 publications

Element Geochemical Characteristics of Sedimentary Rocks and Its Geological Significance from the Upper Permian Linxi Formation in the Songliao Basin

Element Geochemical Characteristics of Sedimentary Rocks and Its Geological Significance from the Upper Permian Linxi Formation in the Songliao Basin

Geochemical, radiometric, and environmental approaches for the assessment of the intensity and chronology of metal contamination in the sediment cores from Oualidia lagoon (Morocco)

Geochemical characterization of rare earth elements in sediment profiles from the Oualida lagoon (Morocco)

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