韓國 一部 金ㆍ銀 鑛床에서 産出되는 金ㆍ銀 鑛物과 鑛床의 生成條件(I)

• 영문명: Gold-Silver mineals and the chemical environments of some gold-silver deposits, Republic of Korea(I) -Cheongju gold-silver mine-
• 발행기관: 대한자원환경지질학회
• 저자명: Hyun Koo Lee(李鉉具) Jin Woo choi(崔鎭宇)
• 간행물 정보: 『자원환경지질』21권 3호, 287~309쪽, 전체 23쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1988.06.30

영문 초록

The Cheongju gold-silver mine is located at approximately 36°28′north latitude and 127°31′ east longitude in the Cheongju City of the Chung cheong bug Do, South Korea. Gold-Silver bearing hydrothermal quartz veins, occur in Cheongju Granit of Jurassic age. K-Ar isotope data for sericite in quartz vein indicate that the Au-Ag mineralization took place in early Cretaceous (97.5±2.18 MA. Park, et ai, 1986). Three stage of mineralization recognized anre, from early to later, (I) Sulide stage: pyrite, arsenopyrite, pyrrhotite (Hpo), sphalerite, chalcopyrite, electrum and quartz (II) Electrum stage: pyrite, sphalerite, galena, chalcopyrite, electrum and quartz. (III) Silver mineral stage: pyrite, marcasite, pyrrhotite (Mpo), sphalerite, galena, electrum, native silver argentite, fluorite, calcite and quartz. In this paper, mode of occurrences and chemical compositions of electum and native silver have been investigated by means of microscope and EPMA. Electron probe microanalysis shows that an individual grain of electrum is almost homogeneous in composition. Silver content of electrum ranges from 44.7-67.1 atom.%. Gold content of native silver ranges below 0.2 atom. %. Vicker’s hardness number (VHN) of electrum and native silver ranges 78.2-81.8kg/mm² respectively. The filling temperature of fluid inclusions in quartz ranges from 130-280°C. On the basis of arsenpyrite geothemometer, the equilibrium temperature and sulfur fugacity of the pyrite-arsenopyrite-pyrrhotite(Hpo) assemblage is assumed to be in ange from 300-310°C and 10⁻¹⁰ to 10⁻¹¹ atm. The estimated ore reserviors on Cheongju mine area are calculated to 8000 T/M, averaing 8.6g/t Au, 27.8 g/t Ag, 1.25% Pb, l.65% Zn.

목차

ABSTRACT

序言

周邊地質

鑛床

鑛石鑛物

鑛石鑛物의 微硬度(Microhardness)의 特性

討論

結論

참고문헌