자원환경지질 (Economic and Environmental Geology)
- 제19권spc호
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- Pages.193-206
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- 1986
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- 1225-7281(pISSN)
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- 2288-7962(eISSN)
충청도(忠淸道) 동북부(東北部) 태창(泰昌)·보연(寶蓮), 금왕(金旺) 광산(鑛山)의 금은광화작용(金銀鑛化作用)
Gold-Silver Mineralization of Taechang-Boryeon and Geumwang Mines in Northeastern Chungcheong Provinces
- 발행 : 1986.10.31
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
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