沃川系 土壤 Uranium에 관한 硏究 = Study on Uranium in Soils of the Ogcheon Group

다국어 초록 (Multilingual Abstract)

The uranium concentration of soils of the Deogpyeong and Daejeon-Ri, Cheongcheon-Myeon, Goesan-Goon, Chungcheong Buk-Do, is known to be higher than that concentration of the other soils.
So that it is aimed to be perfect to clarify the reasons like that, for this, a study was carried out that concerning on the mineralogy of the Ogcheon group and on the characteristics of soils from the Ogcheon in this paper.
The U concentration of the problem soils are in the ranging from 4.9 to 43.6ppm with an average value of 17.4 ppm while the other soils are from 4.8 to 12.2 ppm and showing 9.9 ppm as the mean value.
The higher U values could be explained as to be due to the presence of uraninite, torbernite, tyuyamumite, and autunite which are embedded in the graphite slate and in the graphitic materials of the Chang-Ri sublayer of the Ogcheon group.
The uranium minerals, furthermore, might have been received the metamorphism and the weathering that resulted in dissolution of the uranium and finally that are recrystallized around the soil minerals in the ground soil surfaces.
Among the soils of the Deogpyeong and Daejeon-Ri areas, the soils containing the uranium minerals are found in the Heugseog series soil that derived from the phyllite or dark-colored schist of the Ogcheon group. The soil is also mixed black plate-shaped cobbles.
The other soils that also associated with the Heugseog series are the Banggog and Jonggog series soils. Their parent materials are also the same with the Heugseog series.
The soil taxonomic characteristics of the Heugseog series is a Dystric Fluventic Eutrochrepts and for Banggog and Janggog soils are Fluvaquentic Eutrochrepts and Typic Haplaquepts respectively.