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옥천계(沃川系) 함(含)우라늄 탄질암중(炭質岩中)의 우라늄의 존재상태(存在狀態)와 광물종(鑛物種)
이민성,김상욱,Lee, Min Sung,Kim, Sang Wook 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.2
The radioautographing of U-bearing cloaly slate samples were initiated in order to clarify the uranium distribution patterns in the samples of Ogcheon system. Moreover, x-ray powder diffraction and x-ray single crystal analysis studies were undertaken to identify the uranium mineral which was extracted from U-bearing coaly slate. The handspecimens were collected from the Boseong mine, located in Deokpyeong area, Goesan-gun, Chungcheongbug-do. According to the experimental studies, it has been found the following facts: (1) fixed carbon has close relation with uranium contents, (2) quartz veins developed in U-bearing coaly slate are diveded into two groups based on mode of occurrence, formation stage and uranium distribution pattern; early quartz vein ($QV_1$) with low uranium concentration and late quartz vein ($QV_2$) with high uranium concentration, (3) matrixes around $QV_1$ are displayed homogeneous and high uranium concentration, while matrixes around $QV_2$ are low uranium concentration, (4) uranium mineral is identified as a variety of autunite.
옥천대(沃川帶) 함(含)우라늄지층중(地層中)의 우라늄과 타성분(他成分)과의 상관관계(相關關係)
이민성,전효택,Lee, Min Sung,Chon, Hyo Taek 대한자원환경지질학회 1980 자원환경지질 Vol.13 No.4
Some components in uranium-bearing formations which consist mainly of black shale, slate. and low grade coal-bearing formation of Ogcheon Belt were processed statistically in order to find out the geochemical correlations with uranium. Geochemical enrichment of uranium, vanadium and molybdenum in low grade coal-bearing formations and surrounding rocks is remarkable in the studied area. Geochemical correlation coefficient of uranium and molybdenum in the rocks displays about 0.6, and that of uranium and fixed carbon about 0.4. Uranium and vanadium in uranium-bearing low grade coals denote very high correlation with fixed carbon, which is considered to be responsible for enrichment of metallic elements, especially molybdenum. Close geochemical correlation of uranium-molybdenum couple in the rocks can be applied as a competent exploration guide to low grade uranium deposits of this area.
Cu-Fe-Sn-S계(系) 광물(鑛物)의 산출상태(産出狀態)와 상안정관계(相安定關係)
이민성,Lee, Min Sung 대한자원환경지질학회 1980 자원환경지질 Vol.13 No.4
Stannite is mainly found in hypothermal ore deposits, whereas mawsonite and stannoidite occur characteristically with bornite and chalcopyrite in subvolcanic (xenothermal) ore deposits. Mawsonite always shows the replacement on the rims of stannoidite grains or along the grain boundaries of stannoidite, bornite and chalcopyrite. In the Tada mine, Japan, the following mineral assemblages of the Cu-Fe-Sn-S minerals were observed. 1) bornite-stannoidite; 2) stannoidite-chalcopyrite; 3) stannite-chalcopyrite; 4) bornite-mawsonite-stannoidite; 5) bornite-stannoidite-chalcopyrite; 6) mawsonite-stannoidite-chalcopyrite; 7) stannoidite-stannite-chalcopyrite; 8) bornite-mawsonite-stannoidite-chalcopyrite The heating and D.T.A. experimental results indicate that natural stannoidite containing 3 weight percent of zinc decomposes to bornite, stannite and chalcopyrite at above $500^{\circ}C$, whereas zinc-free synthetic stannoidite is stable up to $800^{\circ}C$. The stability temperature of zincian stannoidite depends on the zinc content. Mawsonite is stable at temperatures below $390^{\circ}C$ and decomposed to stannoidite, bornite and chalcopyrite above it. According to the sulfur fugacity determination by the electrum tarnish method the univariant assemblage of mawsonite, bornite, stannoidite and chalcopyrite requires a higher sulfur fugacity than that of bornite, stannoidite and chalcopyrite assemblage.