大田西南地帶에 있어서의 沃川帶 우라늄鑛床에 對한 鑛物學的 및 地化學的 硏究

• 영문명: Mineralogical and Geochemical Studies of Uranium Deposits of the Okchon Group in Southwestern District off Taejon, Korea
• 발행기관: 대한자원환경지질학회
• 저자명: Suckew Yun(尹碩奎)
• 간행물 정보: 『자원환경지질』17권 4호, 289~298쪽, 전체 10쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1984.08.30

영문 초록

Uraniferous black slates of the Okchon sequence occur in Koesan (northeast) through Miwon-Boun (middle) to the southwest off Taejon (southwest) within the Okchon fold belt. The Uraniferous balck slates in the southwest off Taejon are particularly well developed in Chubu (northeast) and Moksso-ri (middle) areas whereas they are less developed in Jinsan (southwest) area. The uraniferous beds range from less than a meter to 40 meters in thickness and range from less than 0.02% U3O8 (cut-off-grade) to 0.05% U3O8 in the southwestern district off Taejon. Electron microprobe analysis of uranium-minerals found in graphitic slate samples enables to estimate their major compositions semi-quantitatively so that uraninite, ferro-uranophane and chlopinite are tentatively identified. Uranium-minerals are closely associated with carbon and metal sulfides. Correlation analysis of trace element concentrations revealed that U and F.C., and U and Mo are lineary correlative respectively and their correlation coefficients are positively high whereas those of U and V, U and Mn, and U and Zr are negatively low, implying that uranium mineralization has been closely related with concentrations of carbon and molybdenum. Stable isotope analyses of pyrite sulfur range widely from +11.5% to -23.3% in δ³⁴S values whereas those of graphite carbon fall within a narrow range between -23.3% and -28.9% in δ¹³C values. The wide range of δ³⁴S values suggests that the sulfur could be of meteoric origin rather than of igneous source. The narrow range of δ¹³C values, which are close to those of coal, indicates that the graphite is organic carbon in origin. Therefore, it is concluded that the uranium mineralization in the Okchon sequence took place primarily in sedimentary environment rich in organic matter and sulfide ion, both of which served as the reducing agents to convert soluble uranyl complex to insoluble uranium dioxide.

목차

Abstract

序論

秋富-珍山地帶의 우라늄鑛床

含우라늄鑛物과 隨伴鑛物

우라늄鑛床의 地化學

要約과 結論

謝辭

參考文獻