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<p>The geochemical characterizations of the Upper Eocene carbonates of the Abu Rimth (Ab. Rth) Formation were used to shade more light on the occurrence, distribution and ecological implications of (REEs) &amp; (TEs) elements in carbonates for Abu Rimth Plateau (Ab. Rth Formation). This article discusses the distribution and concentration of La, Ce, Sc and Y with environmental implications for the total REEs group as well as to determination of their origin and post-depositional alteration. The chemical results indicated that the studied carbonates show high enrichment of Ca and poor enrichment of Na<sub>2</sub>O, K<sub>2</sub>O, Al<sub>2</sub>O<sub>3</sub> and Fe<sub>2</sub>O<sub>3</sub> with intermediated enrichment of SiO<sub>2.</sub> TEs contents pointed out that these carbonates were accumulated under marine environment characterized by, high salinity and hot climatic conditions. The redox elements and U/Th ratios (0.09) revealed that these studied carbonate rocks were formed in oxic environment. The average Rb/Sr (0.001) and the LREE/HREE (0.99) in the studied carbonate samples revealed that the prevalence of low intensity of weathering. Average content of the (REEs) and (TEs) are arranged as the following; in the studied samples. The Redox-sensitive REE elements and the significant negative Ce anomaly were reflecting these carbonates were deposited in oxic-seawater environments. The pollution indices of (REEs) and (TEs) revealed that the current samples are commonly show low polluation and ecological risk. These facts support the carbonate rocks of Abu Rimth Formation are friendly environmental and suitable for building and several industries.</p>

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Geochemical evaluation of the rare earth and trace elements in the Upper Eocene carbonate of Abu Rimth Formation, Southern Galala Plateau, Eastern Desert, Egypt

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  • 发表日期：

    2025年3月29日

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  • Esmat A. Abou El-Anwar

摘要

The geochemical characterizations of the Upper Eocene carbonates of the Abu Rimth (Ab. Rth) Formation were used to shade more light on the occurrence, distribution and ecological implications of (REEs) & (TEs) elements in carbonates for Abu Rimth Plateau (Ab. Rth Formation). This article discusses the distribution and concentration of La, Ce, Sc and Y with environmental implications for the total REEs group as well as to determination of their origin and post-depositional alteration. The chemical results indicated that the studied carbonates show high enrichment of Ca and poor enrichment of Na2O, K2O, Al2O3 and Fe2O3 with intermediated enrichment of SiO2. TEs contents pointed out that these carbonates were accumulated under marine environment characterized by, high salinity and hot climatic conditions. The redox elements and U/Th ratios (0.09) revealed that these studied carbonate rocks were formed in oxic environment. The average Rb/Sr (0.001) and the LREE/HREE (0.99) in the studied carbonate samples revealed that the prevalence of low intensity of weathering. Average content of the (REEs) and (TEs) are arranged as the following; in the studied samples. The Redox-sensitive REE elements and the significant negative Ce anomaly were reflecting these carbonates were deposited in oxic-seawater environments. The pollution indices of (REEs) and (TEs) revealed that the current samples are commonly show low polluation and ecological risk. These facts support the carbonate rocks of Abu Rimth Formation are friendly environmental and suitable for building and several industries.