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JIANG Yun-yun,LAI Ya-wen,DUAN Tai-cheng,SHI Hou-li.Characteristics of Rare Earth Elements in Volcanic Rocks from Changbai Mountain[J].Rock and Mineral Analysis,2013,32(5):825-831
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Characteristics of Rare Earth Elements in Volcanic Rocks from Changbai Mountain
Received:March 10, 2013  Revised:June 21, 2013
DOI:
Key words: Changbai Mountain volcanic rocks  trachybasalt  trachyte  rare earth elements  existing phases
Author NameAffiliationE-mail
JIANG Yun-yun College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China
National Analytical Research Center of Electrochemistry & Spectroscopy, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China 
 
LAI Ya-wen College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China  
DUAN Tai-cheng National Analytical Research Center of Electrochemistry & Spectroscopy, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China tcduan@ciac.jl.cn 
SHI Hou-li College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China  
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Abstract:
      Changbai Mountain is located in the circum-pacific Cenozoic volcanic region, where basalt is widely distributed over nearly 20000 km2, and in which, high contents of rare earth elements (REEs) have been reported. As it is known, the value for utilization of such REE resources depends not only on their contents but also on their existing characteristics, however, no related reports have been made in this respect about the REEs in the Changbai Mountain area so far. In this work, using Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), the main component elements and rare earth elements in the volcanic rocks from Changbai Mountain were both accurately determined, the results revealing that the composition of the rocks is similar to lithofacies of basalt and trachyte, and the amount of the REEs was as high as 211-893 μg/g, with REEs enrichment being more easily found in the latter. Furthermore, negative europium anomalies (δEu) of 0.06-0.69 were observed, and the ratios of light rare earth elements and heavy rare earth elements (∑LREEs/∑HREEs) had a range of 3.80-5.61, which meant that the LREEs were prone to be more enriched. Finally, a grade extraction procedure was carried out to study the REEs existing phases, the results show that the REEs mainly exist as phosphate phase (52.9%-88.5%), carbonate phase (14.6%-43.8%) and oxides (6.04%-18.4%), while those of silicate phase and ion adsorption phase were the least. The grade extraction procedure was proven to be accurate, with recovery yields of 91.1%-108%, providing a feasible strategy for similar analytical purposes.