Volume 25, Issue 3 (9-2017)                   www.ijcm.ir 2017, 25(3): 529-542 | Back to browse issues page

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Abedini A, Habibi Mehr M. Studies of normative mineralogy and rare earth elements geochemistry of the Gazanjeh bauxite deposit, southeast of Mahabad, NW Iran. www.ijcm.ir. 2017; 25 (3) :529-542
URL: http://ijcm.ir/article-1-952-en.html
Abstract:   (850 Views)
The Gazanjeh bauxite deposit (SE Mahabad, West-Azarbaidjan province) is a typical residual sedimentary deposit with dolomitic limestone host rock of Permian age in northwestern Iran. Calculations of normative values of minerals using obtained results from XRD and XRF analyses in a selected profile indicate that diaspore, hematite, and pyrophyllite were major mineralogical phases of this deposit and include 71.73 to 94.66 % of mineralogical composition of ores, approximately. Based on normative values of minerals, this deposit was formed from two-type ores, (1) clayey bauxite and (2) iron-rich bauxite. Based upon chemical analyses, REE values vary in the ores from 30.14 to 379.55 ppm. Values of La/Y, Eu/Eu*, and Ce/Ce* in the ores are within the ranges of 0.33-3.16, 0.57-1.36, and 0.87-7.05, respectively.  Combination of the obtained results from investigation of trend of lanthanides changes and elemental ratios in the selected profile suggest that factors such as change in physico-chemical conditions of depositional environment (pH and Eh), fluctuations in level of groundwaters table, degree of complexation with carbonatic lighands, difference in the stability of lanthanides-bearing minerals, and mineral control have played the important role in distribution and mobilization of REEs during formation and development of the studied bauxitic ores.   
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Type of Study: Research | Subject: Special
Received: 2017/08/29 | Accepted: 2017/08/29 | Published: 2017/08/29

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