Paper Information

Title: 

STUDY OF RARE EARTH ELEMENTS DISTRIBUTION IN THE HARD BAUXITE OF THE JAJARM BAUXITE DEPOSIT

Type: PAPER
Author(s): ASNA ASHARI AMIR,ESMAEILI DARYOUSH,RAHIMPOUR BONAB HOSSEIN,AMINI FAZL A.
 
 
 
Name of Seminar: GEOLOGICAL CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  IRANIAN GEOLOGICAL SOCIETY
Date:  2005Volume 9
 
 
Abstract: 

Jajarm bauxite deposit (north east of Iran) is the largest diasporic bauxite deposit of Iran which is located as a stratiform ore body between Elika and Shemshak formations. From the bottom to top of the profile this deposit is consists of lower kaolinite, shaly and hard bauxite, and upper kaolinite, respectively. The main focus of this study is to investigation Rare Earth Elements (REE) geochemistry and distribution in the hard bauxite section of the deposit. Moreover, likelihood of REE-bearing mineral occurrence is investigated by using correlation coefficients between REE(s) and other elements. Chondrite normalized spider diagram for Ce and Eu (especially Ce) in hard bauxite, show different trends relative to other REEs Accordingly, they show positive and almost negative anomalies, respectively. This observation could be ascribed to the presence of these elements with different valences relative to the other REE(s) in hard bauxite section, it means that Ce participate in mineral structure with its Ce+4 form and to some extent, Europium as Eu+2. The ratio of La/Y in hard bauxite is indicative of acidic conditions in this part of the profile that possibly caused REE leaching from the top of the profile and their precipitation on the lower part.

 
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