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http://dx.doi.org/10.9727/jmsk.2012.25.4.295

Occurrence of REE-bearing Allanite with Th-mineral (thorite) in Wolhoengri, Hadong, Korea  

Choi, Jin Beom (Department of Earth and Environmental Sciences and Research Institute of Natural Sciences, Gyeongsang National University)
Kwak, Ji Young (Department of Earth and Environmental Sciences and Research Institute of Natural Sciences, Gyeongsang National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.25, no.4, 2012 , pp. 295-304 More about this Journal
Abstract
Ilmenite mine was developed in the anorthosites which intruded Precambrian Jirisan gneiss complex in Wolheongri, Okjong-myeon, Hadong. Ti-ore bodies are confined to the intercumulated type anorthosites, where REE-bearing allanite occurred as veins. The chemistry of allanites shows relatively low in CaO (11.02~12.81 wt%), but high in ${\Sigma}R_2O_3$ (R = Ce, La, Nd) (17.21~21.58 wt%), respectively. Abnormally high radioactive detection ascribes to the presence of small particles of thorium mineral known as thorite ($ThSiO_4$). Thorite shows 65~72.78 wt% ($ThO_2$) and 5.49~12.78 wt% ($UO_2$) in composition. The radioactive prospecting could be a strong tool to find REE-bearing allanite which is closely associated with Ti-ore deposits.
Keywords
ilmenite; anorthosite; intercumulated type; REE (rare earth element); allanite; thorite;
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