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REE Tetrad Effect as a Powerful Indicator of Formation Conditions of Karst Bauxites: A Case Study of the Shahindezh Deposit, NW Iran
Ali ABEDINI,
Mansour REZAEI AZIZI,
Ali Asghar CALAGARI,
Corresponding Author
Ali ABEDINI
Department of Geology, Faculty of Sciences, Urmia University, 5756151818 Urmia Iran
Corresponding author. E-mail: [email protected] and [email protected]Search for more papers by this authorMansour REZAEI AZIZI
Department of Geology, Faculty of Sciences, Urmia University, 5756151818 Urmia Iran
Search for more papers by this authorAli Asghar CALAGARI
Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, 5166616471 Tabriz Iran
Search for more papers by this authorAli ABEDINI,
Mansour REZAEI AZIZI,
Ali Asghar CALAGARI,
Corresponding Author
Ali ABEDINI
Department of Geology, Faculty of Sciences, Urmia University, 5756151818 Urmia Iran
Corresponding author. E-mail: [email protected] and [email protected]Search for more papers by this authorMansour REZAEI AZIZI
Department of Geology, Faculty of Sciences, Urmia University, 5756151818 Urmia Iran
Search for more papers by this authorAli Asghar CALAGARI
Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, 5166616471 Tabriz Iran
Search for more papers by this authorAbout the first and corresponding author:
Ali ABEDINI: an associate professor in the Department of Geology, Faculty of Sciences, Urmia University, Iran. He specializes in economic geology and applied geochemistry and is the author and coauthor of 235 papers on the geology of Iran.
Abstract
Study of the concentration of major, trace, and rare earth elements (REE) in the Shahindezh karst bauxite deposit, northwestern Iran clarifies the relationship of the tetrad effect with geochemical parameters in the bauxite ores. The existence of irregular curves in the chondrite-normalized REE patterns as well as non-CHARAC behavior of geochemically isovalent pairs (Y/Ho) are related to the tetrad effect. The meaningful positive correlation between the sizes of the calculated T3 tetrad effect and some geochemical factors such as Y/Ho, ΣREE, La/Y, (La/Yb)N, and (LREE/HREE)N as well as some major oxides-based parameters like Al2O3 + LOI/SiO2 + Fe2O3, Al2O3/Fe2O3, Al2O3 + LOI, IOL, and SiO2 + Fe2O3 indicate that the studied bauxite horizon was likely deposited by different (acidic and/or alkalic) solutions at different stages. The lower part of the studied horizon with a thickness of ∼4.7 m displays alkali characteristics whereas the upper parts of the horizon with a thickness of ∼5.3 m are characterized by more acidic conditions. These results are fully supported by the co-occurrence of convex-concave tetrad effect curves in the chondrite-normalized REE patterns. Therefore, the tetrad effect phenomenon used in this study has proved to be a good and reliable geochemical proxy to assess the conditions of the depositional environment in the Shahindezh bauxite ores.
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