忠淸道 東北部 泰昌ㆍ寶蓮, 金旺 鑛山의 金銀鑛化作用

• 영문명: Gold-silver mineralization of Taechang-boryeon and Geumwang mines in northeastern Chungcheong Provinces
• 발행기관: 대한자원환경지질학회
• 저자명: Seon Gyu Choi(崔善奎) No Young Park(朴魯榮) Sung Won Park(朴性元)
• 간행물 정보: 『자원환경지질』19권 5호, 193~210쪽, 전체 18쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1986.10.30

영문 초록

A number of auriferous veins occur in the Precambrian metamorphic terrain from Chungju to Mugeug district. These gold(-silver) deposits consist mainly of the fissure-filling quartz veins intruding the Precambrian gneiss or schist and Jurassic or Cretaceous granite. These gold (-silver) deposits can be divided into two mineralization epochs, (a) gold-rich veins related to Daebo igneous activity, and (b) gold-silver veins related to Bulgugsa igneous activity. These two groups of ore deposits with different generation can be characterized by the mode of occurrence of ore vein and the ore mineral associations. The auriferous quartz veins of Taechang and Boryeon mines associated with late Jurassic igneous activity are massive in character, and show the simple mineral assemblages and low Ag/Au ratio in the ores, representing a single mineralization system. The ore minerals are predominantly quartz containing minor or trace amonts of pyrrhotite, sphalerite, galena, pyrite, chalcopyrite and electrum. Electrum is closely associated with pyrrhotite and has chemical compositions from 61.4 to 78.5 atomic % Au. Fluid inclusion data suggest that ore minerals were deposited at temperatures between 238 and 390℃ from CO₂-rich fluids. The gold and/or silver-bearing quartz veins of Geumwang mine related to middle Cretaceous igneous activity are characterized by the multistage history, diverse mineral assemblages with high Ag/Au ratio in the ores. The ores of Geumwang mine have two contrasting mineral assemblages (1) pyrite+galena+sphalerite+arsenopyrite+electrum+argentite, representing the higher gold mineralization, and (2) pyrite+chalcopyrite+galena+sphalerite+arsenopyrite+silver sulfosalts+electrum+native silver+argentite, representing the higher silver mineralization. Electrum is closely associated with pyrite and has chemical compositions from 11.2 to 49.9 atomic % Au. The depositional environment during the higher gold mineralization can be estimated as the range of both temperature and sulfur fugacity, T=200~300℃, logf (S₂)=10⁻¹⁰~10⁻¹⁵. The higher silver mineralization may be interpreted to have formed a range of falling temperature (150~200℃) and low sulfur fugacity(10⁻¹⁵~10⁻¹⁸). These temperature data are consistent with homogenization temperatures of fluld inclusions in quartz. Thus, the gold veins related to the Daebo igneous activity may be formed by the environment of higher temperature and pressure than the gold-silver veins associated with the Bulgugsa igneous activity.

목차

Abstract

序言

地質鑛床槪要

鑛石과 鑛物共生關係

鑛床의 生成環境

鑛床成因에 對한 考察

結言

參考文獻