期刊
ACTA GEOLOGICA SINICA-ENGLISH EDITION
卷 93, 期 4, 页码 912-927出版社
WILEY
DOI: 10.1111/1755-6724.13763
关键词
Geochemistry; REE; Tetrad effect; Karst bauxite; Shahindezh; Iran
资金
- Research Bureau of Urmia University
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 T-3 tetrad effect and some geochemical factors such as Y/Ho, sigma REE, 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 similar to 4.7 m displays alkali characteristics whereas the upper parts of the horizon with a thickness of similar to 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据