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http://dx.doi.org/10.22807/KJMP.2022.35.3.283

Mineral Geochemistry of the Albite-Spodumene Pegmatite in the Boam Deposit, Uljin  

Park, Gyuseung (School of Earth and Environmental Sciences, Seoul National University)
Park, Jung-Woo (School of Earth and Environmental Sciences, Seoul National University)
Heo, Chul-Ho (Critical Minerals Research Center, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Korean Journal of Mineralogy and Petrology / v.35, no.3, 2022 , pp. 283-298 More about this Journal
Abstract
In this study, we investigated the mineral geochemistry of the albite-spodumene pegmatite, associated exogreisen, and wall rock from the Boam Li deposit, Wangpiri, Uljin, Gyeongsangbuk-do, South Korea. The paragenesis of the Boam Li deposit consists of two stages; the magmatic and endogreisen stages. In the magmatic stage, pegmatite dikes mainly composed of spodumene, albite, quartz, and K-feldspar intruded into the Janggun limestone formation. In the following endogreisen stage, the secondary fine-grained albite along with muscovite, apatite, beryl, CGM(columbite group mineral), microlite, and cassiterite were precipitated and partly replaced the magmatic stage minerals. Exogreisen composed of tourmaline, quartz, and muscovite develops along the contact between the pegmatite dike and wall rock. The Cs contents of beryl and muscovite and Ta/(Nb+Ta) ratio of CGM are higher in the endogreisen stage than the magmatic stage, suggesting the involvement of the more evolved melts in the greisenization than in the magmatic stage. Florine-rich and Cl-poor apatite infer that the parental magma is likely derived from metasedimentary rock (S-type granite). P2O5 contents of albite in the endogreisen stage are below the detection limit of EDS while those of albite in the magmatic stage are 0.28 wt.% on average. The lower P2O5 contents of the former albite can be attributed to apatite and microlite precipitation during the endogreisen stage. Calcium introduced from the adjacent Janggun formation may have induced apatite crystallization. The interaction between the pegmatite and Janggun limestone is consistent with the gradual increase in Ca and other divalent cations and decrease in Al from the core to the rim of tourmaline in the exogreisen.
Keywords
Lithium pegmatite; Greisen; Boam deposit; Uljin;
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